Emerson Liebert NXL 750 kVA, Liebert NXL 400 kVA, Liebert NXL 625 kVA, Liebert NXL 1100 kVA, Liebert NXL 300 kVA Operation And Maintenance Manual

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AC Power For Business-Critical Continuity™

Liebert® NXL

Operation and Maintenance Manual–250-1100kVA, 60Hz, Three Phase Single-Module & Multi-Module

™

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BATTERY CABINET PRECAUTIONS

The following warning applies to all battery cabinets supplied with UPS systems. Additional warnings and cautions applicable to battery cabinets may be found in Important Safety Instructions on

page -1 and 4.4 - Battery Maintenance.

WARNING

Internal battery strapping must be verified by manufacturer prior to moving a battery cabinet (after initial installation).

• Battery cabinets contain non-spillable batteries.

• Keep units upright.

• Do not stack.

• Do not tilt. Failure to heed this warning could result in smoke, fire or electric hazard. Call 1-800-LIEBERT before moving battery cabinets (after initial installation). For systems using DC sources other than batteries, refer to the manufacturers's

recommendations for handling and care.

Contacting Emerson Network Power® for Support

Contact Emerson Network Power Liebert® Services for information or repair service in the United States at 1-800-LIEBERT (1-800-543-2378).

For repair or maintenance service outside the 48 contiguous United States, contact Liebert Services, if available in your area. For areas not covered by Liebert Services, the authorized distributor is responsible for providing qualified, factory-authorized service.

Have the following information available before calling Liebert Services:

Part Numbers: ________________________________________________________________

Serial Numbers: _______________________________________________________________

kVA Rating: __________________________________________________________________

Date Purchased: _______________________________________________________________

Date Installed: ________________________________________________________________

Location: _____________________________________________________________________

Input Voltage/Frequency: ______________________________________________________

Output Voltage/Frequency: _____________________________________________________

DC Source Reserve Time: ______________________________________________________

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TABLE OF CONTENTS

BATTERY CABINET PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

1.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2 Modes of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2.1 Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2.2 Bypass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2.3 Battery Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2.4 Maintenance Bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2.5 ECO Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2.6 Intelligent Paralleling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.0 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

2.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 Touchscreen Navigation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.2.1 Main Display Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.2.2 Configurations Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.3 Event Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.4 Status Reports Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.5 Startup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.6 Shutdown Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.7 Transfer Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.8 Battery Management Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2.9 System View—1+N Systems Only. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2.10 Metering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.11 Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.12 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.13 Silence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2.14 Modes of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2.14.1 Load on Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2.14.2 OK to Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2.14.3 Input Power Failure—Load on DC Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2.14.4 Off DC Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2.14.5 Emergency Module Off (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.14.6 Remote Emergency Power Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2.14.7 ECO Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

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2.15 Manual Operations—All Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2.15.1 Startup—Single Module System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2.15.2 Startup—N+1 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

2.15.3 Startup—1+N System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

2.15.4 Load Transfer and Retransfer—Single Module System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

2.15.5 Maintenance Bypass Load Transfers—Single Module System . . . . . . . . . . . . . . . . . . . . . . . . 38

2.15.6 Load Transfer—N+1 System: Remove UPS from N+1 System (Collective) . . . . . . . . . . . . . . 40

2.15.7 Load Transfer—N+1 System: Add UPS to N+1 System (Collective) . . . . . . . . . . . . . . . . . . . . 40

2.15.8 Load Transfer—1+N System: Remove a UPS from System (Collective) . . . . . . . . . . . . . . . . . 41

2.15.9 Load Transfer—1+N System: Add a UPS to the System (Collective) . . . . . . . . . . . . . . . . . . . 42

2.15.10 Load Transfer—1+N System: Transfer System to Bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

2.15.11 Load Transfer—1+N System: Transfer System to Inverter. . . . . . . . . . . . . . . . . . . . . . . . . . . 44

2.15.12 Load Transfer—1+N System: Transfer to Maintenance Bypass . . . . . . . . . . . . . . . . . . . . . . . 45

2.15.13 Shutdown—Single Module UPS System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

2.15.14 Shutdown—N+1 UPS System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

2.15.15 Shutdown—1+N UPS: UPS Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

2.15.16 Shutdown—1+N UPS: System Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

2.15.17 1+N System Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

2.16 Automatic Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

2.16.1 Overloads (Without Transfer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

2.16.2 Automatic Transfers to Bypass (Overload Condition) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

2.16.3 Automatic Transfers to Bypass, UPS System Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

2.16.4 Automatic Retransfers to UPS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

3.0 OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

3.1 Input Contact Isolator Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

3.2 Programmable Relay Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

3.2.1 Configuring the Programmable Relay Board Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

3.3 Remote Alarm Status Panel RAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

3.3.1 Lamp Test/Reset Push button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

3.3.2 Audio Reset Push button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

3.4 Digital Load Bus Sync . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

3.4.1 System Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

3.4.2 LBS Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

3.4.3 Normal Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

3.4.4 Slave Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

3.4.5 Master System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

3.4.6 Slave System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

3.5 ECO Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

3.5.1 ECO Mode Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

3.5.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

3.5.3 Bypass Qualification limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

3.5.4 Conditions to Activate ECO Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

3.5.5 Conditions to Suspend ECO Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

3.5.6 Conditions to Terminate ECO Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

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3.6 Intelligent Paralleling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

3.6.1 Intelligent Paralleling Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

3.6.2 Intelligent Paralleling Target Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

3.6.3 Conditions to Activate Intelligent Paralleling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

3.6.4 Conditions to Suspend Intelligent Paralleling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

3.6.5 Intelligent Paralleling Module Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

3.6.6 Module Standby Rotation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

4.0 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

4.1 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

4.2 Liebert Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

4.2.1 Professional Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

4.3 Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

4.3.1 Record Log. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

4.3.2 Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

4.3.3 Limited Life Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

4.4 Battery Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

4.4.1 Battery Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

4.5 Detecting Trouble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

4.6 Reporting a Problem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

4.7 Corrective Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

4.8 Upstream Feeder Circuit Breaker Setting Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

5.0 SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

5.1 DC Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

5.1.1 Battery Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

5.2 Other DC Sources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

5.3 Environmental Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

APPENDIX A-UPS ALARM AND STATUS MESSAGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A79

iii

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FIGURES

Figure 1 Typical single module UPS system one-line diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Figure 2 Main component locations—250 to 400kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3 Main component locations—500kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 4 Main components, 625kVA Liebert NXL, N+1 multi-module unit without static bypass . . . . . . . 7

Figure 5 Main components, 625kVA Liebert NXL UPS, SMS and 1+N multi-module unit with

static bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 6 Main component locations—750kVA with Static Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 7 Main component locations—750kVA without Static Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 8 Main components, 1+N multi-module or SMS with static bypass, 1100kVAw UPS. . . . . . . . . . . . 9

Figure 9 Main components, 1100kVA UPS N+1 multi-module without static bypass . . . . . . . . . . . . . . . . 10

Figure 10 Main Display Screen, typical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 11 Mimic display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 12 Monitor/mimic display example: Normal power flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 13 Monitor/mimic display example: Utility fail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 14 Monitor/mimic display example: load on bypass, UPS On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 15 Monitor/mimic display example: load on bypass, UPS module Off . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 16 Rating Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 17 System Settings parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 18 Adjustable setpoints parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 19 Battery Equalize settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 20 Battery Management Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 21 Typical Event Management Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 22 UPS shutdown popup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 23 System shutdown popup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 24 Time remaining display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 25 Battery cycle monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 26 Battery cycle monitor summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 27 Status View - 1+N systems only. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 28 1+N status view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 29 Load on bypass (UPS not available). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 30 Load on bypass, UPS available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 31 Load on UPS, bypass available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 32 Input power fail, load on DC source. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 33 Load on UPS, DC source not available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 34 Emergency modules off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 35 Remote emergency power off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 36 ECO Mode power flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 37 Startup commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 38 1+N system start menu commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 39 UPS with two-breaker bypass cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 40 N+1 Transfer menu commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 41 1+N UPS Transfer to Bypass menu commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Figure 42 1+N UPS Transfer to Inverter menu commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Figure 43 1+N System Transfer menu commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Figure 44 N+1 Shutdown menu commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Figure 45 1+N UPS shutdown menu commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 46 1+N System Shutdown menu commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Figure 47 Current-versus-time curves of overload capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Figure 48 Input contact isolator dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

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Figure 49 Optional Input Contact Isolator Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Figure 50 Control wiring, Programmable Relay Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Figure 51 Programmable relay board dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Figure 52 LBS configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Figure 53 ECO Mode settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Figure 54 ECO Mode scheduling—overall and example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Figure 55 Intelligent Paralleling settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Figure 56 Module standby rotation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

TABLES

Table 1 Input Contact Isolator Board pre-assigned values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Table 2 Input Contact Isolator Board control wiring connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Table 3 Programmable Relay Board pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Table 4 RAS indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Table 5 UPS component service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Table 6 Battery voltage, nominal and float . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Table 7 Battery retorque values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Table 8 Environmental specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Table 9 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Table 10 Liebert NXL alarm and status messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

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IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS

This manual contains important instructions that should be followed during installation and maintenance of your Liebert NXL UPS and DC source.

WARNING

Risk of electric shock. Can cause equipment damage, injury or death. Exercise extreme care when handling UPS cabinets to avoid equipment damage or injury to

personnel. Refer to separate installation manual for equipment handling information and installation procedures.

Follow all DC source safety precautions in 4.0 - Maintenance when installing, charging or servicing DC sources. In addition to the hazard of electric shock, gas produced by batteries can be explosive and sulfuric acid can cause severe burns.

In case of fire involving electrical equipment, use only carbon dioxide fire extinguishers or others approved for use in electrical fire fighting.

Extreme caution is required when performing maintenance. Service and maintenance work must be performed only by properly trained and qualified personnel and in accordance with applicable regulations as well as with manufacturers’ specifications.

Be constantly aware that the UPS system contains high DC as well as AC voltages. With input power off and the DC source disconnected, high voltage at filter capacitors and power circuits should be discharged within 5 minutes. However, if a power circuit failure has occurred, assume that high voltage still exists after shutdown. Check with a voltmeter before making contact.

AC voltage will remain on the system bypass, the UPS output terminals and the static bypass switch, unless associated external circuit breakers are opened.

Check for voltage with both AC and DC voltmeters prior to making contact. When the UPS system is under power, both the operator and any test equipment must be

isolated from direct contact with earth ground and the UPS chassis frame by using rubber mats.

Some components within the cabinets are not connected to the chassis ground. Any contact between floating circuits and the chassis is a lethal shock hazard. Exercise caution that the test instrument exterior does not make contact, either physically or electrically, with earth ground.

Important Safety Instructions

This equipment contains circuitry that is energized with high voltage. Only test equipment designated for troubleshooting should be used. This is particularly true for oscilloscopes. Always check with an AC and DC voltmeter to ensure safety before making contact or using tools. Even when the power is turned Off, dangerously high voltage may exist at the capacitor banks.

Observe all DC source precautions when near the DC source for any reason.

ONLY properly trained and qualified service personnel should perform maintenance on the UPS system. When performing maintenance on any part of the equipment under power, service

personnel and test equipment should be standing on rubber mats. The service personnel should wear insulating shoes for isolation from direct contact with the floor (earth ground).

One person should never work alone. A second person should be standing by to assist and summon help in case an accident should occur. This is particularly true when work is performed on the DC source.

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1.0 INTRODUCTION

Bypass

Input

DC Source

DC Bus

Module

Output

BFB

CB2CB1

MBD

1.1 General Description

The Liebert NXL UPS provides continuous, high-quality AC power to your business-critical equipment, such as telecommunications and data processing equipment. The Liebert NXL UPS supplies power that is free of the disturbances and variations in voltage and frequency common to utility power, which is subject to brownouts, blackouts, surges and sags.

The Liebert NXL utilizes the latest in high-frequency, double-conversion pulse-width modulation technology and fully digital controls to enhance its reliability and increase the ease of use.

As shown in Figure 1, the AC utility source is input at CB1 and the rectifier converts the AC utility into DC power. The inverter converts that DC power from the utility—or DC power from the DC source— into AC power for the load. The DC source will power the load through the inverter in the event of a power failure. The utility source can also power the load through the static bypass.

If maintenance or repair of the UPS is necessary, the load can be switched without interruption in service to the optional maintenance bypass.

Figure 1 Typical single module UPS system one-line diagram

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1.2 Modes of Operation

1.2.1 Normal Mode

Operating in normal mode, the Liebert NXL’s rectifier derives power from a utility AC source and supplies regulated DC power to the inverter, which regenerates precise AC power to supply the connected equipment. The rectifier also uses the utility source power to charge the DC sources.

1.2.2 Bypass Mode

When the Liebert NXL is in bypass mode, the load is directly supported by utility power and is without DC source backup protection.

The Liebert NXL’s inverter and bypass static switch will shift the load from the inverter to bypass mode without an interruption in AC power if the inverter is synchronous with the bypass and any of the following occurs:

• Inverter fails

• Inverter overload capacity is exceeded

• Inverter is manually turned off by the user

NOTE

If the inverter is asynchronous with the bypass, the static switch will transfer the load from the inverter to the bypass WITH interruption in AC power to the critical load. This interruption will be less than 10ms. This interruption time may be altered by modifying the Output transfer interrupt time setting.

Introduction

1.2.3 Battery Mode

When utility AC power fails, the Liebert NXL protects the critical load by instantaneously channeling DC source power to the inverter, which continues supporting the critical load without interruption.

When utility power returns and is within acceptable limits, the Liebert NXL automatically shifts back to Normal mode, with the rectifier powering the critical load.

1.2.4 Maintenance Bypass

The installation of a Maintenance Bypass Cabinet or Assembly is recommended to allow you to totally isolate the UPS from all power sources. Use of the Maintenance Bypass is described in 2.0 - Operation.

1.2.5 ECO Mode

The ECO Mode feature improves the overall efficiency by powering the critical bus from the bypass static switch instead of the inverter.

The user has the ability to start/stop ECO Mode manually via HMI or automatically based on time and day of week schedule entries.

When the critical bus goes out of tolerance (voltage, frequency or slew rate), the BPSS is turned off and the inverter powers the critical bus.

The inverter is always ready to take the load in the event that the bypass source fails.

1.2.6 Intelligent Paralleling

Intelligent Paralleling is intended to increase system efficiency and to reduce the operating hours on the modules. Intelligent Paralleling will put one or more paralleled modules into standby operation when the number of redundant modules is above the user-specified threshold, plus some hysteresis.

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1.3 Options

A number of options are available from Liebert for your UPS system. (Some options are not available for all ratings.) Described below are the most frequently provided options. Other options are available. Contact your Liebert sales representative for more information.

• Battery and Racks—The batteries provide power in the event of a power outage. The Liebert NXL UPS can use a variety of battery types, provided the battery plant is designed for the UPS DC voltage range and the load requirements of your application.

• Battery Cabinets—Valve-regulated, lead-acid (VRLA) sealed batteries are available in matching cabinets for convenient installation and maintenance in otherwise unprotected space. Depending on the UPS module rating, two or more cabinets may be connected in parallel to provide the additional run time. This option is required to complete the UPS system.

• Module Battery Disconnect—The UPS system utilizes a separate Module Battery Disconnect for remotely located batteries. A sensing circuit in the UPS module, set at the battery low voltage limit, trips the Module Battery Disconnect to safeguard the battery from excessive discharge. The Module Battery Disconnect has an undervoltage release mechanism designed to ensure that during any shutdown or failure mode all battery potential is removed from the UPS system.

• Two Breaker Maintenance Bypass—This switchboard provides make-before-break maintenance bypass. It includes: Maintenance Bypass Breaker (MBB) and Maintenance Isolation Breaker (MIB).

• Load Bus Synchronization—The Load Bus Sync (LBS) option keeps two or more independent UPS systems (and therefore their critical load buses) in sync, even when the modules are operating on DC source or asynchronous AC sources. This means that critical loads connected to both load buses can switch seamlessly between the two.

• Customer Alarm Interface—This optional interface board allows the input and display of eight alarms from customer-supplied contacts, each with a customer-selected name.

• Temperature-Compensated Charging—When the battery temperature exceeds a preset limit (typically 77°F [25°C]), this optional circuit proportionally reduces float charging voltage to prevent overcharging the battery.

• Battery Load Testing—When activated, this option forces the battery string to assume the load for a short period of time.

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2.0 OPERATION

The Liebert NXL UPS is equipped with a microprocessor-based display touchscreen designed for convenient and reliable operation. The display is driven by an easy-to- follow, menu-prompted software.

2.1 Features

The Liebert NXL interface display enables the operator to perform such tasks as:

• Quickly check operational status

• Monitor the power flow through the UPS system and all meter readings

• Execute operational procedures

• Check status reports and history files

• Adjustment programmable parameters (access limited by security access function)

The touchscreen is a white-background display with multicolor text. The display turns on automatically, but after 15 minutes of inactivity the backlight will go out and the display will appear very dim. Touching the screen will reactivate the backlight; the backlight will again be active for 15 minutes. If any screen other than the mimic screen is accessed, that screen will be displayed for 5 minutes without any interaction. If there is no activity for 5 minutes, the display will revert to the basic mimic screen.

Figure 2 Main component locations—250 to 400kVA

Operation

HMI Screen

EPO Button

Liebert IntelliSlot Housings

Input/Output Connections (Behind Inner Door)

External Interface Board

Module Output Circuit Breaker (CB2)

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Main Input Circuit Breaker (CB1)

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Figure 3 Main component locations—500kVA

U40-5C-2000 Rev. 1

Option Box (6 Slots)

Liebert Intellislot Housings

Main Input Circuit Breaker (CB1)

Module Output Circuit Breaker CB2

Back Feed Circuit Breaker (BFB)

Input Busbars

Doors and Inner Skins Removed

Front Doors Removed

Keylock or EMO Button (optional)

Inter-Module Communication Board (Behind HMI Screen)

Bypass Busbars

Input Ground

Output Ground

Output Busbars

DC (-) Input

Ext. Interface Board

HMI Screen

DC (+) Input

Operation

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Figure 4 Main components, 625kVA Liebert NXL, N+1 multi-module unit without static bypass

Liebert IntelliSlot Housings

HMI Screen

Inter-Module Communication Board (IMC) (behind door)

EMO Button (Optional)

Main Input Circuit Breaker (CB1)

Module Output Circuit Breaker (CB2)

FRONT DOORS REMOVED

LIEBERT INTELLISLOT HOUSINGS

MAIN INPUT CIRCUIT BREAKER (CB1)

MODULE OUTPUT CIRCUIT BREAKER (CB2)

BACKFEED CIRCUIT BREAKER (BFB)

KEYLOCK OR EMO BUTTON (OPTIONAL)

FRONT DOORS REMOVED

HMI SCREEN

INTER-MODULE COMMUNICATION BOARD (LOCATED BEHIND HMI SCREEN)

Operation

Figure 5 Main components, 625kVA Liebert NXL UPS, SMS and 1+N multi-module unit with static bypass

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Figure 6 Main component locations—750kVA with Static Bypass

HMI Screen

Liebert IntelliSlot Housings

Main Input Circuit Breaker (CB1)

Module Output Circuit Breaker (CB2)

Backfeed Circuit Breaker (BFB)

Key Lock or EMO Button (Optional)

FRONT DOORS REMOVED

Inter-Module Communication Board (Behind HMI Screen)

FRONT DOORS REMOVED

Liebert IntelliSlot Housings

HMI Screen

Inter-Module Communication Board (Behind HMI Screen)

Key Lock or EMO Button (Optional)

Main Input Circuit Breaker (CB1)

Module Output Circuit Breaker (CB2)

Figure 7 Main component locations—750kVA without Static Bypass

Operation

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Figure 8 Main components, 1+N multi-module or SMS with static bypass, 1100kVAw UPS

FRONT DOORS REMOVED

INPUT CABINET RECTIFIER CABINET DC CABINET INVERTER CABINET

HMI SCREEN

(OPTIONAL)

INTER-MODULE COMMUNICATION BOARD

(LOCATED BEHIND HMI SCREEN)

HMI KEYLOCK OR EMO BUTTON

BYPASS / OUTPUT CABINET

BACKFEED BREAKER

OUTPUT

CIRCUIT

BREAKER

(CB2)

BYPASS

STATIC

SWITCH

MAIN

INPUT

CIRCUIT

(CB1)

CONTROL CABLE BOX

Operation

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Figure 9 Main components, 1100kVA UPS N+1 multi-module without static bypass

FRONT DOORS REMOVED

OUTPUT

CIRCUIT

BREAKER

(CB2)

INPUT CABINET RECTIFIER CABINET DC CABINET INVERTER CABINET OUTPUT CABINET

HMI SCREEN

(OPTIONAL)

INTER-MODULE COMMUNICATION BOARD

(LOCATED BEHIND HMI SCREEN)

HMI KEYLOCK OR EMO BUTTON

CONTROL CABLE BOX

Operation

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Figure 10 Main Display Screen, typical

Mimic Display

Active Event Window

Multipurpose Display

Menu Bar

INPUT

ABC L-L 0 0 0 V I000A Freq 0.0Hz

BATTERY 1 OF 4

Voltage Disable Temp Disable

BYPASS

ABC L-L 0 0 0 V Freq 0.0Hz

Voltage 0V Curr ent Float

CB1

BFB

MBD

BIS1

CB2

Legend Inlet Air Temp 0°C

ABC L-L000V L-N000V I 000A KVA 0 0 0 % KW000% PF 0.0 0.0 0.0 KVA/KW 0/ 0 Freq 0.0Hz Rexfer Timeout 00:00

MODULE OUT PUT

DC BUS

Bypass Input

UPS Input Power

Battery Block

Load

Operation

Figure 11 Mimic display

Bypass Input—Displays the bypass input voltage and the bypass input frequency. The bypass circuit breaker (BFB) is to the right of this block. The circuit breaker status is shown as open or closed.

NOTE

This Bypass Input information does not apply to N+1 Multi-Module systems

UPS Input Power—Displays the UPS input voltage, current and frequency. The input circuit breaker (CB1) is to the right of this block. The circuit breaker status is shown as open or closed.

Battery Block—Displays the DC source voltage and the charge or discharge current to or from the DC source. Pressing this icon switches among the connected DC sources. The Module Battery Disconnect (MBD) is to the right of this block. The circuit breaker status is shown as open or closed.

DC Bus—Displays the DC Bus voltage and the state of the charger.

Load—Displays the output line voltage, phase voltage, current, kVA, kW, power factor and

frequency. The critical load current per phase is also displayed in this block. During an overload, the time remaining before transfer is displayed at the bottom of the load box. After an overload transfer, retransfer timeout is displayed at the bottom of the load box.

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Figure 12 Monitor/mimic display example: Normal power flow

Green – Normal Orange – Marginal Gray – Absent Black – Unknown

Operation

Figure 13 Monitor/mimic display example: Utility fail

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Figure 14 Monitor/mimic display example: load on bypass, UPS On

Green – Normal Orange – Marginal Gray – Absent Black – Unknown

Operation

Figure 15 Monitor/mimic display example: load on bypass, UPS module Off

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2.2 Touchscreen Navigation

2.2.1 Main Display Screen

Several menu items can be accessed from the main display screen (see Figure 10). These menu items are detailed in subsequent sections.

2.2.2 Configurations Menu

Rating

This menu item will display a popup showing the following parameters (see Figure 16). These parameters are entered during commissioning when the UPS is installed.

• Nominal Input Voltage • Unit Model

• Nominal Bypass Voltage • Unit Serial

• Nominal Output Voltage • Maintenance Bypass Model

• Nominal Source Frequency • Maintenance Bypass Serial

• Nominal Output Frequency • Battery Cabinet Model

• Nominal Cell Count • Battery Cabinet Serial

• Output kVA • Order Number 1

• Output KW • Order Number 2

• Configuration Type • Service Telephone Number

• Rectifier Type • Site ID Number

• Input Isolation Transformer • Tag Number

Operation

Figure 16 Rating Parameters

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User Settings

System Settings

These display settings can be changed from the touchscreen. Press the box to the left of each parameter to bring a popup window that will allow the parameter to be changed.

• Backlight Brightness—High or Low (default: Low)

• Time (24hr format)—Adjust Hour, Minute or Seconds

• Date (MM DD, YYYY format)—Adjust Month, Day or Year

• Password – Reset the password (4 characters, alphanumeric, case-sensitive)

• Language—English, Chinese

• Audio level—Range 1 to 10 (default: 5)

• Phase labeling—Auto, ABC, RST, XYZ, RYB, RWB, UVW, 123, L1L2L3 (default: Automatic)

• Module Locator

• Location ID—Alphanumeric

• System Number—Alphanumeric

• Module Label—Alphanumeric

Figure 17 System Settings parameters

Operation

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Operation

Adjustable Setpoints

These warning and alarm settings can be changed from the touchscreen. Press the box to the left of each parameter to bring a popup window that will allow the parameter to be changed.

Max Load Alarm

The module will activate a warning when the load is above any of these settings:

• Phase A (%)—10% to 105% (default: 100%)

• Phase B (%)—10% to 105% (default: 100%)

• Phase C (%)—10% to 105% (default: 100%)

• Delay (second)—0 to 60 (default: 5 seconds)

Manual Xfer Bypass Voltage Limits

These set the upper and lower limits that the bypass voltage must be within for a manual transfer to bypass to be performed.

• Manual Xfer Bypass Voltage Low Limit (%)—1% to 20% (default: 5%)

• Manual Xfer Bypass Voltage High Limit (%)—1% to 15% (default: 5%)

Inlet Air Temp Warning

• Inlet Air Temp Warning—30°C to 40°C (default: 35°C)

NOTE

Temperature will display in both Celsius and Fahrenheit.

Figure 18 Adjustable setpoints parameters

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Battery Management

These DC source settings can be changed from the touchscreen. Press the box to the left of each parameter to bring a popup window that will allow the parameter to be changed.

Battery Equalize

When Battery Equalize is activated (Manual Battery Equalize button under Batt Mgt), the module will charge the batteries to the Equalize Voltage for the length of Equalized Time.

• Equalize Voltage, Vpc - 2.30 to 2.45 (default: 2.3)

• Equalize Time, hours - 0 to 200hours (default: 0)

NOTE

Battery Equalize must be enabled by service to be functional. If Battery Equalize is disabled, the feature will not be available and the menu item will not be displayed.

Figure 19 Battery Equalize settings

Operation

Battery Test

• Auto Test—Enable/Disable (default: disabled)

• Test Cycle, weeks—1 to 26 (default: 13 weeks)

• Time of day, hh:mm—Set Hour and Minute; sets the start time of the automatic battery test

• Start Date, mm dd, yyyyy—Set Month, Day and Year

• Test Duration, minutes—0.5 minute to 30% of full load Operating Time (default: 0.5 minute)

• Minimum Battery Voltage, lead-acid only—1.75VPC to 1.95VPC (default: 1.75VPC); this is the minimum voltage the battery test will stop.

Low Battery Warning Time

• Low Battery Warning Time, minutes—2 to 60, the upper limit is dependent on configured batteries (default: 5 minutes)

Battery Temperature

• Battery Temp Warning—30°C to 50°C (default: 40°C)

• Battery Temp Limit—35°C to 60°C (default: 50°C)

• Disconnect—Enable/Disable (default: disabled)

NOTE

If Disconnect is set to Enable and the Battery Temp Limit is met, the Battery breaker will open.

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Figure 20 Battery Management Parameters

Operation

Cell Count Adjustment

• Cell Count Adjustment— -12 cells to 6 cells (default: 0)

Float Voltage

• Battery Float Voltage, Vpc—2.15 to 2.3 (default: 2.25)

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2.3 Event Management

This menu item permits changing how the Liebert NXL handles Alarms, Faults and Status information. Each event can be configured for the following:

• Latch (yes/no)—Event stays active in the event window, even if the fault condition has been cleared, until user acknowledges it by pressing the “Reset” button.

• Audible (yes/no)—Will set Audible alarm when event occurs

• Event log (yes/no)—Will display event in Event log when it occurs

NOTE

You must press “Save” for changes to take effect.

See Table 10 for a list of alarms, fault and status messages.

Figure 21 Typical Event Management Parameters

Operation

2.4 Status Reports Menu

This menu accesses the events records.

• Event Log—Up to 2048 time/date stamped events are captured in the log. The oldest record will be overwritten with a new record once the buffer reaches 2048 events.

• System Status

• Total Operating Hours—Total number hours the UPS has been operational

• Service Reminders—Displays when service is recommended for Air Filter, AC Filter, DC Filter, and Fan. Also shows when the Warranty and/or Maintenance Agreement will expire.

NOTE

The recommended service time is based on typical life expectancy of those components. These components may need serviced earlier. Talk to your Liebert service representative for more details.

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2.5 Startup Menu

This menu is used to start the UPS and individual devices.

Manual—This will begin the UPS startup. See 2.15 - Manual Operations—All Systems for details.

Devices

• Close Trap—This will start the Input filter, if installed

• Close MBD/BCB—If the MBD is motor-operated, the Close command will enable and energize the motor to close. If the MBD is not motorized, the Close command will enable the breaker UVR. The MBD/BCB must be closed manually. If no MBD is selected, this setting is not displayed.

2.6 Shutdown Menu

This menu permits shutting down the UPS and individual devices. See 2.15 - Manual Operations— All Systems for details.

Open Trap—Open the input trap filter

Open MBD/BCB—Opens the associated MBD or BCB breaker

UPS—Turns off inverter, rectifier and trips all DC source breakers. Transfers to bypass, if available.

NOTE

The following popup window is displayed when the UPS is about to be shut down. To shut down the UPS, an operator must press OK.

Operation

Figure 22 UPS shutdown popup

System—Turns off inverter, rectifier and trips all DC source breakers. Will shut down UPS completely.

NOTICE

Risk of equipment damage. This command will result in the load being shut down.

The following popup window is displayed when the UPS is about to be shut down. To shut down the UPS, an operator must press OK.

Figure 23 System shutdown popup

2.7 Transfer Menu

This menu permits switching between UPS and Bypass mode. A graph in the multipurpose window shows if the UPS is in synch with the bypass. If the UPS and bypass are in synch, pressing Bypass will switch the UPS to Bypass mode. Pressing UPS will switch back to Normal (Inverter) Mode (see Figure 2.8). See 2.15 - Manual Operations—All Systems for details.

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NOTE

If the bypass and UPS are out of synch range, the transfer buttons will be disabled.

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2.8 Battery Management Menu

This menu permits configuring DC source settings.

Time Remaining Graph—Displays the time remaining graph in the multipurpose window; plot the DC source voltage against elapsed time during a Battery Discharge Cycle (see Figure 24). The bottom black line is voltage when the module has reach End of Discharge. This line is programmed during commissioning.

Figure 24 Time remaining display

Operation

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Manual Battery Test—Start/Stop

Manual Battery Equalize—Start/Stop; must be enabled by Emerson Network Power Liebert

Services to be active

Battery Cycle Monitor—Displays how many discharges have occurred for these time periods: 0-30sec, 31-90sec, 91-240sec, 4-15min, 15-30min, 30-60min, 60-240min, 4-8hr, 8hr and up. Each discharge record will include: (see Figure 25)

•# •Max KW

•Date •AH

• Time • Start Temp °C

• Duration • End Temp °C

•Start kW •Battery CB Start

•Min kW •Battery CB End

Figure 25 Battery cycle monitor

Operation

Display summary (see Figure 26)

• Battery Commission Date/Time

• Last Battery Discharge Date/Time

• Active Battery Discharge Time

• Active Battery Amp Hours

• Active Battery KW

• Total Number of Discharges

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Figure 26 Battery cycle monitor summary

Operation

2.9 System View—1+N Systems Only

System View will display the status of each of the system breakers (MOB’s, MIB, MBB). It will display the system output information including, voltage, current, kVA/kW, frequency and number of redundant modules in the system.

Figure 27 Status View - 1+N systems only

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This button will show the following status of each module in the system:

•Comms

• Normal—UPS intermodule communication is working properly

• Failed—UPS intermodule communication is not working properly

•Events

• None—UPS has no active events

• Alarms—UPS has an Alarm

• Fault—UPS has Fault

•Inverter Ready

• NO—UPS Inverter is off

• Yes—UPS Inverter is ready to take load

• Output Volts

• Normal (UPS Output voltage is OK)

• Marginal (UPS Output Voltage is not OK)

• Fail (UPS Output voltage is outside of range)

• Output State

• Normal (UPS is in Normal Mode)

• Off (UPS Inverter is off)

Figure 28 1+N status view

Operation

2.10 Metering

This button will place the metering tables in the multipurpose window.

2.11 Help

This button will display the help menu.

2.12 Reset

This button will reset any non-active latched events.

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2.13 Silence

Bypass

Input

DC Source

DC Bus

Module

Output

BFB

CB2CB1

MBD

This button will silence the audible alarm.

2.14 Modes of Operation

This section illustrates the flow of power through circuit breakers, switches and UPS components during various modes of operation. The same modes of operation apply to all configurations of the Liebert NXL. Highlighted (thick) lines in the diagrams indicate power flow and power availability.

These illustrations do not show an alternate power source (generator) and automatic transfer switch (external to the UPS) that might be present at your installation.

2.14.1 Load on Bypass

Load on Bypass, with the UPS not available, is shown in Figure 29. The UPS system could be in this mode of operation during either initial startup or UPS system shutdown and isolation for maintenance.

NOTE

The bypass modes of operation do not apply to N+1 multi-module systems.

NOTICE

Risk of equipment damage. When the critical load is being supplied power from the bypass line, it is exposed to utility failure and fluctuations.

Figure 29 Load on bypass (UPS not available)

Operation

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2.14.2 OK to Transfer

Bypass

Input

DC Source

DC Bus

Module

Output

BFB

CB2CB1

MBD

Bypass

Input

DC Source

DC Bus

Module

Output

BFB

CB2CB1

MBD

The OK to Transfer status message will be displayed when the bypass line and UPS output power are both available, their voltage, frequency and phase synchronization are matched within specifications, and the Static Switch Disconnects are closed (ON). An alarm message may be displayed to indicate Load On Bypass (Figure 30). If no alarm is displayed, the operating status is Load On UPS (Figure 31).

When the OK to Transfer message is displayed, the load can be manually transferred from the UPS to bypass or the load can be manually retransferred from the bypass to the UPS.

To perform a manual transfer, Use the Load Transfer Procedures screen. Refer to 2.15.4 - Load Transfer and Retransfer—Single Module System.

The UPS control logic will initiate an automatic transfer to bypass if an overload condition exceeds the system current versus time window or if a UPS fault is detected. The control logic may initiate an automatic retransfer to the UPS system when the system is recovering from overloads lasting less than five minutes. Refer to 2.16 - Automatic Operations.

Figure 30 Load on bypass, UPS available

Operation

Figure 31 Load on UPS, bypass available

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2.14.3 Input Power Failure—Load on DC Source

Bypass

Input

DC Source

DC Bus

Module

Output

BFB

CB2CB1

MBD

Bypass

Input

DC Source

DC Bus

Module

Output

BFB

CB2CB1

MBD

If the utility AC power source fails or is outside the acceptable range, the DC source becomes the power source for the UPS module inverters. The UPS continues to supply power to the critical load and also to the UPS controls.

Use the Battery Time screen at the UPS modules to monitor the present DC source voltage compared to the shutdown value. The time the DC source can sustain the load depends on the size of the load and the size and condition of the DC source.

Alarm messages that indicate DC source status are Battery Discharge, Low Battery and Battery Shutdown. The voltage limits for these alarms are displayed on the UPS module Alarm Limit Settings screen. These limits were selected for your installation by Liebert Services during initial startup. The battery block in the UPS module Monitor/Mimic Display indicates Charge or Discharge and the current in amperes.

Figure 32 Input power fail, load on DC source

Operation

2.14.4 Off DC Source

The DC source can be disconnected from the UPS, if required for maintenance, by opening the module battery disconnect (MBD) circuit breaker. In this situation the UPS module will continue to supply conditioned power to the critical load, but if input power fails the UPS system cannot supply power to the load.

CAUTION

When the UPS system is operating with the module battery disconnect (MBD) circuit breaker(s) open, the critical load is not protected from loss of the utility source power.

Figure 33 Load on UPS, DC source not available

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2.14.5 Emergency Module Off (Optional)

Bypass

DC Source

DC Bus

Module

Output

BFB

CB2CB1

MBD

Input

Bypass

DC Source

DC Bus

Module

Output

BFB

CB2CB1

MBD

Input

The Emergency Module Off (EMO) mode will transfer the critical load to the bypass line and remove power from all UPS module components except the controls, bypass circuit breaker and the static switch.

If installed, the Emergency Module Off control is a guarded pad next to the display touchscreen (Figures 2, 6 and 7).

Lift the cover and press the pad. The load will be transferred to bypass, and the DC source (MBD), input and output circuit breakers will be opened (tripped). Refer to 2.15.13 - Shutdown—Single Module UPS System.

Figure 34 Emergency modules off

Operation

2.14.6 Remote Emergency Power Off

The Remote Emergency Power Off control is a user-provided switch located remotely from the UPS system. It usually is installed in the same room as the critical load equipment. This mode can also be initiated by an automatic contact closure in the same external circuit as the manually operated switch.

When the Remote Emergency Power Off switch is operated, all UPS circuit breakers are opened, including the bypass circuit breaker. All power through the UPS is removed from the load. Typically, the REPO circuit also opens the circuit breakers that provide power to the bypass lines and the UPS controls. Refer to 2.15.13 - Shutdown—Single Module UPS System.

Figure 35 Remote emergency power off

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2.14.7 ECO Mode

Bypass

Input

DC Source

BFB

CB2CB1

MBD

Module

Output

DC Bus

When ECO Mode is active, the critical load is supported by the bypass source. The rectifier is On and providing power to the DC source for charging. The inverter is on standby, available to provide power to the critical load if a fault occurs on the bypass line. See Figure 26.

Figure 36 ECO Mode power flow

2.15 Manual Operations—All Systems

The Liebert NXL UPS is designed to function while unattended by an operator. The system control logic automatically handles many important functions, as explained in 2.16 - Automatic Operations. Other procedures must be performed manually.

Manual procedures available to the operator include startup, load transfers and shutdowns. These procedures are performed by using the touchscreen and some manually operated circuit breakers and switches.

This section lists typical step-by-step instructions. The touchscreen will list all steps required for the process, based on the unit’s condition and other factors.

• Startup—including initial startup, recovering from input power failure, recovering from DC source shutdown and recovering from shutdowns for emergencies or maintenance.

• Load Transfers—including transfers from UPS to bypass and retransfers from bypass to the UPS system.

• Maintenance Bypass Load Transfers—including transfers from internal bypass to maintenance bypass and transfers from maintenance bypass to internal bypass.

• Shutdowns—including module shutdowns for maintenance and emergency shutdowns.

Operation

NOTE

The following procedure assumes that the UPS installation inspection and initial startup have been performed by Liebert Services. A Liebert-authorized representative must perform the initial system startup to ensure proper system operation.

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2.15.1 Startup—Single Module System

This section lists typical step-by-step instructions. The touchscreen will list all steps required for the process, based on the unit’s condition and other factors.

WARNING

Risk of electrical shock. Can cause equipment damage, personal injury and death. The following procedure provides power to the critical load distribution system. Verify that

the critical load distribution is ready to accept power. Make sure that personnel and equipment are ready for the critical load distribution system to be energized.

If the installation includes a Maintenance Bypass, power may already be supplied to the critical load equipment through the Maintenance Bypass. If there is no power to the critical load, apply power through the UPS bypass line per the following procedure.

During startup, power is supplied to the critical load through the UPS (internal) bypass line while the UPS system is being energized. Depending on the reason for the UPS system shutdown, power may be present in the bypass line. To determine this, check the Monitor/Mimic Display screen after control power is available.

NOTE

If the system was shut down in response to an “Emergency Off”, there may be alarm messages on the touchscreen that describe system conditions before (or at the time of) the shutdown. Some or all of the alarm conditions may have been resolved. To clear these alarm messages, turn Off control power (see Figures 2, 6 and 7). Wait at least 10 minutes for the control power circuitry to completely de-energize. After 10 minutes, turn control power back On.

Operation

WARNING

Risk of electrical shock and high short circuit current. Can cause equipment damage, personal injury and death.

If the UPS has been shut down for maintenance, verify that all of the UPS system doors are closed and latched. All test equipment must be removed from the system. All electrical connections must be secure.

1. Before applying power to the UPS modules, determine the position of the following circuit breakers and switches:

• Input Circuit Breaker (CB1)—Verify that this breaker on the front of the UPS cabinet (Figures 2, 6 and 7) is in the open position.

• Module Battery Disconnect (MBD)—Verify that this external breaker is open or tripped. If DC source cabinets are used, verify that breakers on all the cabinets are open.

• Bypass Circuit Breaker (BFB)—This circuit breaker (Figures 2, 6 and 7) should be open.

NOTE

If power to the critical load is already supplied through this breaker, keep this breaker closed.

• Output Circuit Breaker (CB2)—This motorized circuit breaker (Figures 2, 6 and 7) should be open.

2. Provide power to the UPS controls of all UPS modules starting up to permit the display touchscreen and system logic to function properly.

a. Close the Bypass Input Breaker (BIB). This breaker is external to the UPS; it may be in the

Maintenance Bypass Cabinet. The display touchscreen should start.

b. Close the Rectifier Feed Breaker (RFB). This breaker is external to the UPS; it may be in the

Maintenance Bypass Cabinet.

3. Start the module: a. Press the “Start-Up” then “Manual Start” menu buttons (see Figure 37). The message “Close

BFB” will appear in the multipurpose window.

b. Close the BFB breaker (see Figures 2, 6 and 7). The message “Press OK to issue BPSS On

Command” will appear.

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Operation

c. Press OK to continue. This will energize the load on the UPS internal bypass. The message

“Close CB1” will appear.

d. Close CB1 (see Figures 2, 6 and 7). The “Press OK to Issue Rectifier On Command” message

will appear.

e. Press “OK.” This will start the UPS’s rectifier. Load is still on internal bypass. The message

“Press OK to Issue Inverter On Command” will appear.

f. Press “OK.” The rectifier will be On and the Inverter will be on standby. Load is still on

internal bypass. The message “Press OK to Issue MBD Enable Command” will appear. g. Press “OK.” h. Close all battery/DC breakers. The UPS will stay in this mode until all breakers are closed.

If the DC sources are not ready to be started up, skip this command. The DC breakers can be

closed individually from the startup command at a later time (see 2.5 - Startup Menu).

NOTE

The DC source charge current may increase quickly, but should slowly decrease. If the system

is recovering from a DC source shutdown or an input power failure, the UPS rectifier will be

recharging the DC source. Recharge current can be more than 100A. The maximum allowable

recharge current for any unit depends on the kVA rating and the DC source recharge current

limit.

The message “Press OK to Issue Transfer Command” will appear. i. Press “OK.” The load is now energized from the UPS inverter.

NOTICE

Risk of equipment damage. If an abnormal situation occurs during this startup procedure, open

the input circuit breaker and investigate the problem. Call Liebert Services if help is required.

WARNING

Risk of electric shock, explosive reaction, hazardous chemicals and fire. Can cause equipment

damage, personal injury and death.

Do not use equalize charging with valve-regulated, lead-acid batteries. Refer to the battery

manufacturer’s manual, available on the manufacturer’s Web site, for specific information

about equalize charging.

Figure 37 Startup commands

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2.15.2 Startup—N+1 System

The following instructions will start an individual UPS module. Repeat these steps for all the UPS units in the system that will be started.

This section lists typical step-by-step instructions. The touchscreen will list all steps required for the process, based on the unit’s condition and other factors.

WARNING

Risk of electrical shock and high short circuit current. Can cause equipment damage, personal

injury and death.

If the UPS has been shut down for maintenance, verify that all of the UPS system doors are

closed and latched. All test equipment must be removed from the system. All electrical

connections must be secure

WARNING

Risk of electrical shock. Can cause equipment damage, personal injury and death.

The following procedure may provide power (with DC source available) to the critical load

distribution system. Verify that the critical load distribution is ready to accept power. Ensure

that personnel and equipment are ready for the critical load distribution system to be energized.

NOTICE

Risk of improper startup. May cause equipment damage.

These steps should be performed after the SCC startup has been initialized.

Operation

NOTICE

Risk of equipment damage. If an abnormal situation occurs during this startup procedure, open

the input circuit breaker and investigate the problem. Call Liebert Services if help is needed.

NOTE

If the system was shut down in response to an “Emergency Off,” there may be alarm messages

on the touchscreen that describe system conditions before or at the time of the shutdown. Some

or all of the alarm conditions may have been resolved.

To clear these alarm messages, turn Off control power (see Figure 6). Wait at least 10 minutes

for the control power circuitry to completely de-energize. After 10 minutes, turn control power

back On.

1. Before applying power to the UPS modules, determine the position of the following circuit breakers and switches:

• Input Circuit Breaker (CB1)—Verify that this breaker on the front of the UPS cabinet (Figure 6) is in the open position.

• Module Battery Disconnect (MBD)—Verify that this external breaker is open or tripped. If DC source cabinets are used, verify that breakers on all the cabinets are open.

• Output Circuit Breaker (CB2)—This motorized circuit breaker (Figure 6) should be open.

• Module Output Breaker (MOB) Optional—This circuit breaker should be open. This breaker is external to UPS, possibly in the paralleling gear.

2. Close the Rectifier Feed Breaker (RFB). This breaker is external to UPS, possibly in the paralleling gear. The display touchscreen should start.

3. Close the MOB breaker, if present on the system.

4. Press the “Start-Up,” then the “Manual Start” menu button (see Figure 37). The “Close CB1” message will appear.

5. Close CB1 (see Figure 6). The “Press OK to Issue Rectifier On Command” message will appear.

6. Press “OK.” This will start the UPS’ rectifier. The message “Press OK to Issue Inverter On Command” will appear.

7. Press “OK.” The rectifier will be On and the Inverter will be on standby. The message “Press OK to Issue MBD Enable Command” will appear.

8. Press “OK.”

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9. Close all Battery/DC breakers associated with this module. The UPS will stay in this mode until

all breakers are closed. Skip this command if the DC sources are not ready to be started. The DC breakers can be closed

later from the startup command (see 2.5 - Startup Menu).

NOTE

The DC source charge current may increase quickly, but should slowly decrease. If the system is recovering from a DC source shutdown or an input power failure, the UPS rectifier will be recharging the battery. Recharge current can be more than 100A. The maximum allowable recharge current for a unit depends on the kVA rating and the DC source recharge current limit.

The UPS is ready to be placed online. Go to the SCC Startup screen to complete the startup.

2.15.3 Startup—1+N System

This section lists typical step-by-step instructions. The touchscreen will list all steps required for the process, based on the unit’s condition and other factors.

WARNING

Risk of electrical shock and high short circuit current. Can cause equipment damage, personal injury and death.

Operation

WARNING

Risk of electrical shock. Can cause equipment damage, personal injury and death. The following procedure may provide power to the critical load distribution system. Verify

that the critical load distribution is ready to accept power. Make sure that personnel and equipment are ready for the critical load distribution system to be energized.

NOTICE

Risk of equipment damage. If an abnormal situation occurs during this startup procedure, open the input circuit breaker and investigate the problem. Call Liebert Services if help is needed.

NOTE

If the system was shut down in response to an “Emergency Off,” there may be alarm messages on the touchscreen that describe system conditions before or at the time of the shutdown. Some or all of the alarm conditions may have been resolved.

To clear these alarm messages, turn Off control power (see Figures 2, 6 and 7). Wait at least 10 minutes for the control power circuitry to completely de-energize. After 10 minutes, turn control power back On.

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Operation

Start buttons on touchscreen for 1+N systems

Startup—1+N System with External Maintenance Bypass

1. Before applying power to the UPS modules, determine the position of the following circuit breakers and switches:

• Input Circuit Breaker (CB1)—Verify that this breaker on the front of the UPS cabinet is in the

open position (see Figures 2and 6for the location).

• Module Battery Disconnect (MBD)—Verify that this external breaker is open or tripped. If DC source cabinets are used, verify that breakers on all the cabinets are open.

• Output Circuit Breaker (CB2)—This motorized circuit breaker should be open (see Figures 2 and 6).

• Bypass Circuit Breaker (BFB)—This circuit breaker should be open (see Figures 2and 6for the location).

• Module Output Breaker (MOB) optional—This circuit breaker should be open. This breaker is located external to UPS, possibly in the paralleling gear.

• Maintenance Bypass Breaker (MBB) optional—This circuit breaker should be open. This breaker is external to UPS, possibly in the paralleling gear.

NOTE

If power to the critical load is already supplied through this breaker, keep this breaker closed.

• Maintenance Isolation Breaker (MIB) optional—This circuit breaker should be open. This breaker is external to UPS, possibly in the paralleling gear.

a. Close the Bypass Input Breaker (BIB). These breakers are external to the UPS units, possibly

in the Maintenance Bypass Cabinet. The display touchscreens should start.

b. Close the Rectifier Feed Breaker (RFB. These breakers are external to the UPS units,

possibly in the Maintenance Bypass Cabinet.

2. On the first module, press “Start-up” then “Manual Start,” then the “All Modules” menu buttons (see Figure 38).

Figure 38 1+N system start menu commands

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Operation

3. If the system has optional Bypass breakers (MBB/MIB), the message “Close MBB” will appear in the multipurpose window.

a. Close the MBB breaker. The message “Press OK to begin startup of this module” will appear. b. Press “OK” to continue. This will begin the startup procedure for the UPS module.

The message “Close BFB” will appear in the multipurpose window.

4. Close the BFB breaker (see Figures 2and 6). The message “Press OK to issue BPSS On Command” will appear.

5. Press “OK” to continue. This will energize the UPS internal bypass. The message “Close CB1” will appear.

6. Close CB1 (see Figures 2and 6). The message “Press OK to Issue Rectifier On Command” will appear.

7. Press “OK.” This will start the UPS’ rectifier. The message “Press OK to Issue Inverter On Command” will appear.

8. Press “OK.” The rectifier will be On and the Inverter will be on standby. The message “Press OK to Issue MBD Enable Command” will appear.

9. Press “OK.”

10. Close all battery/DC breakers. The UPS will stay in this mode until all breakers are closed. Skip this command if the DC sources are not ready to be started. The DC breakers can be closed

later individually from the startup command (see 2.5 - Startup Menu).

NOTE

The DC source charge current may increase quickly, but then should slowly decrease. If the system is recovering from a DC source shutdown or an input power failure, the UPS rectifier will be recharging the DC source. Recharge current can be more than 100A. The maximum allowable recharge current for a unit depends on the kVA rating and the DC source recharge current limit.

This message will appear: “Close the MOB’s of this module and enough of the other modules, then press ‘OK’ [x of y MOB’s closed].”

11. Close the MOB’s for the UPS’s in the system being started. The [x of y MOBs closed] will update as the MOBs are closed (“x” is number of MOBs closed and “y” is number of MOBs in the system). This message will appear: “Start enough other modules to support the total system load, then press ‘OK’ [x of y inverters started].”

12. At each module, Press “Start-up,” then “Manual Start,” then “This Module” menu buttons (see Figure 38).

a. Perform Steps 6through 9 on the rest of the UPS units in the system ready to be placed on-

line.

b. The [x of y inverters started] will update as inverters are brought to standby (“x” is the

number of inverters on standby and “y” is the number of inverters in the system).

NOTE

Do not transfer the module from the transfer screen from any of these modules.

13. Go to the first UPS and press “OK.” The message “Close MIB” will appear in the multipurpose window.

14. Close the MIB breaker. The message “Open MBB” will appear in the multipurpose window.

15. Open the MBB breaker. The message “Press OK to transfer all modules to inverters” will appear.

16. Press “OK.”

This will put the system online and the load on the UPS.

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Operation

Startup—1+N System Without External Maintenance Bypass

1. Before applying power to the UPS modules, determine the position of the following circuit breakers and switches:

• Input Circuit Breaker (CB1)—Verify that this breaker on the front of the UPS cabinet is in the

open position (see Figures 2and 6for the location).

• Module Battery Disconnect (MBD)—Verify that this external breaker is open or tripped. If DC source cabinets are used, verify that breakers on all the cabinets are open.

• Output Circuit Breaker (CB2)—This motorized circuit breaker should be open (see Figures 2 and 6for the location).

• Bypass Circuit Breaker (BFB)—This circuit breaker should be open (see Figures 2and 6for the location).

• Module Output Breaker (MOB) Optional—This circuit breaker should be open. This breaker is external to UPS, possibly in the paralleling gear.

2. Provide power to the UPS controls of all UPS modules starting up to permit the display touchscreen and system logic to function properly.

a. Close the Bypass Input Breaker (BIB). These breakers are external to each UPS, possibly in

the Maintenance Bypass Cabinet. The display touchscreens should start.

b. Close the Rectifier Feed Breaker (RFB). These breakers are external to each UPS, possibly in

the Maintenance Bypass Cabinet.

3. On the first module, press “Start-up,” then “Manual Start,” then the “All Modules” menu buttons (see Figure 38). The message “Caution: Starting into an unknown load with less than required number of modules may result in an Overload” will appear.

4. Press “OK.” The message “Close this Module’s BFB & MOB Breaker” will appear.

5. Close the BFB Breaker and the MOB Breaker connected to this unit. This message will appear: “Close enough other Modules BFBs & MOBs to support the total system load, then press OK.”

6. Close the BFB breakers and MOB breakers of all the UPS units in the system that are to be brought online.

7. Press “OK.” This message will appear: “Press OK to turn on all available Bypass Static Switches.”

8. Press “OK.” This will turn On the Bypass Static Switch of the modules with BFB breaker and MOB breaker closed in Step 5. The message “Press OK to start this module’s UPS” will appear.

9. Press “OK.” The message “Close CB1” will appear.

10. Close CB1 (see Figures 2and 6). The message “Press OK to Issue Rectifier On Command” will appear.

11. Press “OK.” This will start the UPS’ rectifier. The message “Press OK to Issue Inverter On Command” will appear.

12. Press “OK.” The rectifier will be On and the inverter will be on standby. The message “Press OK to Issue MBD Enable Command” will appear.

13. Press “OK.”

14. Close all Battery/DC breakers associated with this module. The UPS will stay in this mode until all breakers are closed.

Skip this command if the DC sources are not ready to be started. The DC breakers can be closed individually from the startup command (see 2.5 - Startup Menu) at a later time.

15. At each module, press “Start-up” then “Manual Start,” then “This Module” menu buttons (see

Liebert® NXL

NOTE

This message will appear: “Go to other modules and select ‘This Module’ from start-up menu and start-up that module’s UPS.”

Figure 38).

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16. Perform Steps 10 through 14 on the rest of the UPS units in the system ready to be placed on line. This message will appear: “This Module Startup is complete. Finish the All Module Startup in process or proceed to the Transfer menu to transfer.”

17. Press “Exit.”

NOTE

Do not transfer the module from the transfer screen from any of these modules.

18. Go to the first UPS and press “OK.” This message will appear: “Press OK to transfer all modules to inverters.”

19. Press “OK.” This will put the system online and the load on the UPS.

2.15.4 Load Transfer and Retransfer—Single Module System

Changing the load from the UPS system to the UPS bypass is called a transfer. Changing the load from UPS bypass to the UPS system is called a retransfer. Note that the UPS system control logic can initiate automatic load transfers and retransfers. Refer to 2.16 - Automatic Operations.

Transfer Procedure

1. Press the “Transfer” menu button on the touchscreen. The Transfer/Retransfer screen will appear in the multipurpose window (see Figure 2.8).

2. If the UPS output is in synchronization with the bypass, press the “Bypass” button. This will transfer the load from the UPS to the bypass.

Retransfer Procedure

1. Press the “Transfer” menu button on the touchscreen. The Transfer/Retransfer screen will appear in the multipurpose window (see 2.8 - Battery Management Menu).

2. If the UPS output is in synchronization with the bypass, press the “UPS” button. This will transfer the load from Bypass to UPS.

Operation

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2.15.5 Maintenance Bypass Load Transfers—Single Module System

DC Source

DC Bus

BFB

CB2CB1

MBD

MBB

MIB

MBFB

BIB

RIB

UPS Module

Two Breaker Maintenance Bypass Cabinet

Main Input

Switchgear

Critical

Load

Follow these instructions to manually transfer the load between the Maintenance Bypass and the UPS bypass line. Do not transfer the load between the Maintenance Bypass and the UPS module (inverter) output. Use the Monitor/Mimic Display screen to verify that the UPS bypass line is available.

Figure 39 UPS with two-breaker bypass cabinet

Operation

NOTICE

Risk of equipment damage. Failing to follow the proper sequence when operating any circuit breaker may cause damage to the connected equipment. Operating a Maintenance Bypass circuit breaker out of sequence could cut off power to the critical load.

NOTICE

Risk of equipment damage. The UPS system must be on internal bypass before performing the following procedures and operating the MIB or the MBB, or damage to the UPS may occur and the critical load may be lost.

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Operation

Maintenance Bypass Load Transfers—Single Module System: If Load is on UPS Bypass

1. Transfer the UPS system to bypass (see 2.15.4 - Load Transfer and Retransfer—Single Module System). The “OK to transfer” lamp on the key-release unit will light.

NOTE

If the maintenance bypass cabinet or switchboard has any other type of custom interlock, follow the specific instructions for that interlock system to remove the key.

2. If using a key interlock system, depress the key-release unit push button, turn the key and remove from key-release unit.

NOTE

The UPS system is now locked in bypass and cannot be retransferred to the Inverter until the key is reinserted.

3. If using a key interlock system, insert the key into the lock for the Maintenance Bypass Breaker (MBB); retract the bolt.

4. Close the Maintenance Bypass Breaker (MBB).

NOTICE

Risk of improper operation sequence. May cause equipment damage. Failure to close the Maintenance Bypass Breaker (MBB) will interrupt power to the load.

5. Open the Maintenance Isolation Breaker (MIB). The UPS system is now isolated from the critical load, and the load is now on Maintenance Bypass.

6. If using a key interlock system, remove the key from the lock for the Maintenance Isolation Breaker (MIB).

7. If the maintenance bypass cabinet or switchboard has an optional two-key interlock system, replace the key into the solenoid.

8. If UPS bypass shutdown is required, open the Bypass Input Breaker (BIB).

Maintenance Bypass Load Transfers—Single Module System: If Load is on Maintenance Bypass

1. Close the Bypass Input Breaker (BIB) or verify that it is closed. Note that the UPS Bypass circuit breaker (motorized) must also be closed. Refer to 2.15.1 - Startup—Single Module System.

2. If using a key interlock system, depress the key-release unit push button, turn the key and remove it from the key-release unit.

NOTE

The UPS system is now locked in bypass and cannot be retransferred to the Inverter until the key is returned.

3. If using a key interlock system, insert the key into the lock for the Maintenance Isolation Breaker (MIB); retract the bolt.

4. Close the Maintenance Isolation Breaker (MIB).

NOTICE

Risk of improper operation sequence. May cause equipment damage. Failure to close the Maintenance Isolation Breaker (MIB) will interrupt power to the load.

5. Open the Maintenance Bypass Breaker (MBB). Load is now on UPS Internal Bypass.

6. If using a key interlock system, remove the key from the lock for the Maintenance Bypass Breaker (MBB) to lock it open.

7. If the maintenance bypass cabinet or switchboard has an optional two-key interlock system, reinsert the key into the solenoid.

8. The UPS system may now be transferred from bypass to UPS (see 2.15.4 - Load Transfer and Retransfer—Single Module System).

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2.15.6 Load Transfer—N+1 System: Remove UPS from N+1 System (Collective)

1. Press the “Transfer” menu button on the touchscreen. The Connect/Remove Inverter screen will appear in the multipurpose window (see Figure 40 - N+1 Transfer menu commands).

2. Press “Remove Inverter” button. This will open CB2.

NOTE

If disengaging this UPS from the system will cause the other UPS units in the system to overload, then the “Remove Inverter” will not be activated.

Figure 40 N+1 Transfer menu commands

Operation

2.15.7 Load Transfer—N+1 System: Add UPS to N+1 System (Collective)

1. Verify that the UPS is On and the Inverter is in standby mode (see 2.15.2 - Startup—N+1 System).

2. Press the “Transfer” menu button on the touchscreen. The Connect/Remove Inverter screen will appear in the multipurpose window (see Figure 40 - N+1 Transfer menu commands).

3. Press “Connect Inverter” button. This will close CB2.

NOTE

If the UPS is not synchronized with the other units in the system, then the “Connect Inverter” button will be disabled.

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2.15.8 Load Transfer—1+N System: Remove a UPS from System (Collective)

1. Under the “Transfer” menu button on the touchscreen, press the “This Module” button. The Transfer/Retransfer screen will appear in the multipurpose window (see Figure 41).

2. If the system has enough capacity to turn Off the unit, press the “Remove Inverter” button. This will open CB2.

NOTE

If disengaging this UPS from the system will cause the other UPS units in the system to overload, then the “Remove Inverter” will be disabled.

3. To isolate the UPS from the critical bus, open the MOB breaker. This breaker is external to UPS, possibly in the paralleling gear.

4. See 2.15.7 - Load Transfer—N+1 System: Add UPS to N+1 System (Collective) to reconnect the module to the collective.

Figure 41 1+N UPS Transfer to Bypass menu commands

Operation

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2.15.9 Load Transfer—1+N System: Add a UPS to the System (Collective)

This section lists typical step-by-step instructions. The touchscreen will list all steps required for the process, based on the unit’s condition and other factors.

1. Provide power to all the UPS controls to permit the display touchscreen and system logic to function properly.

a. Close the Bypass Input Breaker (BIB). This breaker is external to the UPS, possibly in the

Maintenance Bypass Cabinet. The display touchscreen should startup.

b. Close the Rectifier Feed Breaker (RFB). This breaker is external to the UPS, possibly in the

Maintenance Bypass Cabinet

c. Bypass Circuit Breaker (BFB)—This circuit breaker should be open (see Figures 2and 6for

the location).

d. Optional Module Output Breaker (MOB)—This circuit breaker should be open. This breaker

is external to UPS, possibly in the paralleling gear.

2. Start the UPS and put the Inverter in Standby Mode. a. Close the MOB breaker associated with this module. b. Press “Start-up,” then “Manual Start,” then “This Module” menu buttons (see Figure 38).

The “Close BFB” message will appear in the multipurpose window.

c. Close the BFB breaker (see Figures 2and 6). The “Close CB1” message will appear. d. Close CB1 (see Figures 2and 6). This message will appear: “Press OK to Issue Rectifier On

Command.”

e. Press “OK.” This will start the UPS’ rectifier. The message “Press OK to Issue Inverter On

Command” will appear.

f. Press “OK.” The rectifier will be On and the Inverter will be on standby. The message “Press

OK to Issue MBD Enable Command” will appear. g. Press “OK.” h. Close all Battery/DC breakers associated with this module. The UPS will stay in this mode

until all breakers are closed.

Operation

NOTE

Skip this command if the DC sources are not ready to be started. The DC breakers can be closed

individually from the startup command later (see 2.5 - Startup Menu).

This message will appear: “ ‘This Module Startup’ is complete. Proceed to Transfer menu to

connect this Inverter.”

3. Press “Exit.”

4. Under the Transfer menu on the touchscreen, press the “This Module” button. The Transfer/Retransfer screen will appear in the multipurpose window (see Figure 41.

5. Press the “Connect Inverter” button. This will close CB2.

NOTE

If the UPS is not synchronized with the other units in the system, then the “Connect Inverter” will be disabled.

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Figure 42 1+N UPS Transfer to Inverter menu commands

Operation

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2.15.10 Load Transfer—1+N System: Transfer System to Bypass

1. Under the “Transfer” menu button on the touchscreen, press the “All Modules” menu button. The Transfer/Retransfer screen will appear in the multipurpose window (see Figure 43).

2. If the UPS outputs are synchronized with their bypass, press the “1+N Bypass” button. This will turn On all available static switches and open CB2 in all the modules.

NOTE

If this UPS is not part of the collective, then the “1+N Bypass” will not be activated.

NOTE

The load will now be on Static Bypass in each UPS. It is no longer protected by the UPS.

Figure 43 1+N System Transfer menu commands

Operation

2.15.11 Load Transfer—1+N System: Transfer System to Inverter

1. Verify that all the UPS units are On and the Inverters are in standby mode (See 2.15.3 Startup—1+N System.)

2. Under the “Transfer” menu button on the touchscreen, press the “All Modules” menu button. The Transfer/Retransfer screen will appear in the multipurpose window (see Figure 41).

3. Press “1+N UPS” button. This will close CB2 and open the Bypass Static Switch in all the modules.

NOTE

If the UPS is not synchronized with the other units in the system, then the “1+N UPS” will not be activated.

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2.15.12 Load Transfer—1+N System: Transfer to Maintenance Bypass

Follow these instructions to manually transfer the load between Maintenance Bypass and the System Static Bypass. Do not transfer the load between Maintenance Bypass and the System Inverter output. Use the Monitor/Mimic Display screen to determine whether the UPS bypass line is available.

Load Transfer—1+N System: Transfer to Maintenance Bypass if Load is on System Static Bypass

This section lists typical step-by-step instructions. The touchscreen will list all steps required for the process, based on the unit’s condition and other factors.

1. Transfer the UPS system to bypass (see 2.15.10 - Load Transfer—1+N System: Transfer

System to Bypass). The “OK to transfer” lamp on the key-release unit will light.

NOTE

If the maintenance bypass cabinet or switchboard has any other type of custom interlock, follow the specific instructions for that interlock system to remove the key.

2. If using a key interlock system, depress the key-release unit push button, turn the key and remove it from key-release unit.

NOTE

The UPS system is now locked in bypass and cannot be transferred until the key is returned.

3. If using a key interlock system, insert the key into the lock for the Maintenance Bypass Breaker (MBB); retract the bolt.

4. Close the Maintenance Bypass Breaker (MBB).

Operation

NOTE

Failure to close the Maintenance Bypass Breaker (MBB) will interrupt power to the load.

5. Open the Maintenance Isolation Breaker (MIB). The UPS system is now isolated from the critical load and the load is now on Maintenance Bypass.

6. If using a key interlock system, remove the key from the lock for the Maintenance Isolation Breaker (MIB).

7. If the maintenance bypass cabinet or switchboard has an optional, two-key interlock system, reinsert the key into the solenoid.

8. If UPS bypass shutdown is required, open the Bypass Input Breaker (BIB).

Load Transfer—1+N System: Transfer to UPS if Load is on Maintenance Bypass

1. If the UPS modules are Off, start the system. Refer to 2.15.3 - Startup—1+N System.

2. Place all the UPS units in the system on Static Bypass. Refer to 2.15.10 - Load Transfer—1+N System: Transfer System to Bypass.

3. If using a key interlock system, depress the key-release unit push button, turn the key and remove from key-release unit.

4. If using a key interlock system, insert the key into the lock for the Maintenance Isolation Breaker (MIB); retract the bolt.

5. Close the Maintenance Isolation Breaker (MIB).

NOTE

Failure to close the Maintenance Isolation Breaker (MIB) will interrupt power to the load

6. Open the Maintenance Bypass Breaker (MBB). Load is now on UPS System Static Bypass.

7. If using a key interlock system, remove the key from the lock for the Maintenance Bypass Breaker (MBB) to lock it open.

8. If the maintenance bypass cabinet or switchboard has an optional two-key interlock system, reinsert the key into the solenoid.

The UPS system can now be transferred from bypass to UPS (see 2.15.11 - Load Transfer—1+N System: Transfer System to Inverter).

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2.15.13 Shutdown—Single Module UPS System

Perform a Module Shutdown to remove power from a UPS module.

Read all warnings in 4.0 - Maintenance before performing any maintenance on your Liebert NXL UPS. These warnings and cautions must be observed during any work on the UPS.

NOTE

Service and maintenance work must be performed only by properly trained and qualified personnel and in accordance with applicable regulations as well as with manufacturers’ specifications.

Use the module Monitor/Mimic Display to determine the operating condition of the UPS module.

UPS Shutdown

NOTE

This shutdown turns Off the inverter and the rectifier and trips all DC source breakers. Transfers to bypass if available

1. Press the “Shutdown” menu button on the touchscreen. The Shutdown screen will appear in the multipurpose window (see Figure ).

2. Press the “UPS” button. This brings up a warning that pressing “OK” will shut down the UPS and, if bypass is not available, drop the load (see Figure 22).

3. Press “OK” to shut down the UPS.

Operation

UPS System Shutdown

NOTE

This shutdown turns Off the inverter and the rectifier and trips all DC source breakers. Will shut down UPS completely.

1. Press the “Shutdown” menu button on the touchscreen. The Shutdown screen will appear in the multipurpose window (see Figure ).

2. Press the “System” button. This brings up a warning that pressing “OK” will shut down the UPS and, if bypass is not available, drop the load (see Figure 22).

3. Press “OK” to shut down the system.

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2.15.14 Shutdown—N+1 UPS System

Perform a Module Shutdown Procedure when you want to disconnect power from a UPS module. For System shutdown, see the SCC operation and maintenance manual, SL-25514, available at the Liebert Web site: www.liebert.com

Read all warnings in 4.0 - Maintenance before performing any maintenance on a Liebert NXL UPS. These warnings and cautions must be observed during any work on the UPS.

NOTE

Service and maintenance work must be performed only by properly trained and qualified personnel and in accordance with applicable regulations as well as with manufacturers’ specifications.

Use the module Monitor/Mimic Display to determine the operating condition of the UPS module.

NOTE

This shutdown turns Off the inverter and the rectifier and trips all DC source breakers. Transfers load to bypass, if available.

1. Press the “Shutdown” menu button on the touchscreen. The Shutdown screen will appear in the multipurpose window (see Figure 44).

2. Press the “UPS” button. This brings up a warning that pressing “OK” will shut off the UPS and transfer the load to bypass, if available (see Figure 22).

3. Press “OK” to shut down the UPS.

Operation

Figure 44 N+1 Shutdown menu commands

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2.15.15 Shutdown—1+N UPS: UPS Shutdown

This section lists typical step-by-step instructions. The touchscreen will list all steps required for the process, based on the unit’s condition and other factors.

Perform a Module Shutdown Procedure to remove power from a single UPS module in the system. Read all warnings in 4.0 - Maintenancebefore performing any maintenance on your Liebert NXL

UPS. These warnings and cautions must be observed during any work on the UPS.

NOTE

This shutdown turns Off the inverter and the rectifier and trips all DC source breakers. Transfers to bypass if available

Use the module Monitor/Mimic Display to determine the operating condition of the UPS module.

1. Press “Shutdown” then “This Module” menu buttons (see Figure 38). The Shutdown screen will appear in the multipurpose window (see Figure 45).

2. Press the “UPS” button to transfer the load to Bypass Static Switch Bypass and shut down the UPS.

2.15.16 Shutdown—1+N UPS: System Shutdown

This section lists typical step-by-step instructions. The touchscreen will list all steps required for the process, based on the unit’s condition and other factors.

Perform a Module Shutdown Procedure when you want to remove power from a single UPS module in the system.

Operation

Read all warnings in 4.0 - Maintenancebefore performing any maintenance on your Liebert NXL UPS. These warnings and cautions must be observed during any work on the UPS.

NOTE

This shutdown turns Off the inverter and the rectifier and trips all DC source breakers. This will shut down the UPS completely.

1. Press the “Shutdown” then “This Module” menu buttons (see Figure 38). The Shutdown screen will appear in the multipurpose window (see Figure 45).

2. Press the “System” button to shut down the UPS including the Bypass Static Switch.

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Figure 45 1+N UPS shutdown menu commands

Operation

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2.15.17 1+N System Shutdown

This section lists typical step-by-step instructions. The touchscreen will list all steps required for the process, based on the unit’s condition and other factors.

Perform a System Shutdown Procedure when you want to remove power from the entire UPS system. Read all warnings in 4.0 - Maintenancebefore performing any maintenance on your Liebert NXL

UPS. These warnings and cautions must be observed during any work on the UPS.

NOTE

Service and maintenance must be performed only by properly trained and qualified personnel and in accordance with applicable regulations as well as with manufacturers’ specifications.

Use the module Monitor/Mimic Display to determine the operating condition of the UPS module.

System Shutdown Procedure

1. On any module, press “Shutdown,” then press the “All Modules” menu button (see Figure 38). This message will appear: “This system has no MBB. If shutdown is started, the load will no longer be support by the UPS. Load drop may occur.”

2. Press “OK”. The Shutdown screen will appear in the multipurpose window (see Figure 46).

3. Press the “1+N” button. All modules in the system will transfer to Bypass.

4. If an external wrap-around bypass is not installed: a. This message will appear: “UPS output will turn-off. Do you want to proceed?” Press “Yes” to

continue the shutdown.

b. All the UPS breakers—CB1, CB2, BFB and DC source—will open. The message “Open all

MOB’s” will appear. c. Open all the MOB breakers to isolate the UPS units from each other d. To isolate the system, open all the MOB breakers and utility feeds to the bypass and rectifier

inputs

5. If an external, wraparound bypass is installed: a. If using a key interlock system, depress the key-release unit push button, turn the key and

remove it from the key-release unit.

Operation

NOTE

The UPS system is now locked in bypass and cannot be transferred until the key is returned.

b. If using a key interlock system, insert the key into the lock for the Maintenance Bypass

Breaker (MBB); retract the bolt.

c. Close the Maintenance Bypass Breaker (MBB).

NOTE

Failure to close the Maintenance Bypass Breaker (MBB) will interrupt power to the load.

d. Open the Maintenance Isolation Breaker (MIB). The UPS system is now isolated from the

critical load and the load is now on Maintenance Bypass.

NOTE

The UPS units will shut down

e. If using a key interlock system, remove the key from the lock for the Maintenance Isolation

Breaker (MIB).

f. If the maintenance bypass cabinet or switchboard has an optional two-key interlock system,

reinsert the key into the solenoid.

g. All the UPS breakers—CB1, CB2, BFB and DC source—will open. The message “Open all

MOB’s” will appear.

h. Open all the MOB breakers to isolate the UPS units from each other

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i. To isolate the system, open all MOB breakers and utility feeds to the bypass and rectifier

inputs.

Figure 46 1+N System Shutdown menu commands

Operation

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2.16 Automatic Operations

150%

125%

110%

1 min

10 min

60min

85min

105%

The Liebert NXL UPS system is designed to function while unattended by an operator. The system control logic monitors the performance of the UPS, the availability of power sources and the current required by the critical load.

The system control logic:

• Determines what overload conditions can be sustained without a transfer to bypass.

• Initiates an automatic transfer to bypass to sustain an overload or when selected UPS faults occur.

• Can initiate an automatic retransfer to the UPS after an overload has been cleared.

• Initiates an automatic transfer to bypass and emergency module shutdown when specified UPS faults occur.

2.16.1 Overloads (Without Transfer)

The UPS system is capable of sustaining full output voltage (±2% of the nominal voltage) for overload conditions that remain within (under) the current versus time curve of overload capacity (Figure 47). Note that the time scale is not linear.

For high current demands of short duration (momentary overloads) the critical load is supplied simultaneously by both the UPS system and the bypass line. Whenever an overload condition occurs, you should determine the cause of the overload. If an overload condition exceeds the overload capacity, the UPS system initiates an automatic load transfer to the bypass line.

For overloads above the Input Current Limit, a DC source, such as a battery system or a generation source, must be available. The Input Current limit has a default setting of 125% rated output current.

Operation

Figure 47 Current-versus-time curves of overload capacity

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2.16.2 Automatic Transfers to Bypass (Overload Condition)

The UPS system will initiate an automatic load transfer to the bypass line if an overload condition exceeds the current-versus-time curve of overload capacity or if specified UPS system faults occur. Load On Bypass is illustrated in Figure 30.

The Overload Transfer and Output Undervoltage alarm messages will initiate an automatic transfer to bypass and the Load On Bypass message will be displayed. The active event window will display the Automatic Transfer to Bypass message. Other UPS system faults will initiate an automatic transfer to bypass followed immediately by the shutdown and isolation of the UPS system. Refer to

2.16.3 - Automatic Transfers to Bypass, UPS System Faults. In an automatic transfer to bypass the output and bypass circuit breakers do not overlap as they do in

a manual transfer. The static bypass switch is fired (closed), the output circuit breaker is opened, and the bypass circuit breaker is closed. Bypass power is supplied to the critical load through the static bypass switch during the short time while both circuit breakers are open.

NOTE

A load transfer to the bypass line will be completed whenever an automatic transfer to bypass is initiated. If the OK to Transfer condition is present, the load transfer will be uninterrupted. If the Static Switch Unable alarm message is present for any reason, the automatic transfer will be interrupted for 40 to 120 milliseconds. Because of the reliability of the UPS components, an interrupted load transfer is a very unlikely occurrence.

2.16.3 Automatic Transfers to Bypass, UPS System Faults

For specified UPS system faults, the control logic will initiate an automatic transfer to bypass followed immediately by a shutdown and isolation of the UPS system. The output, DC source (MBD) and input circuit breakers are open. The bypass breaker will be closed if the bypass line is available. Note that the bypass line is usually not available during Low Battery Shutdown. The circuit diagram is the same as illustrated in Figure 34 for Emergency Module Off.

Operation

The following UPS system faults will initiate an automatic transfer to bypass:

• DC Overvoltage Shutdown

• Inverter Fault

• Low-Battery Shutdown

• Output Overvoltage and Undervoltage

• Overload Shutdown

• Equipment Overtemperature

• Rectifier Fuse Blown

Refer to Table 10 for more information about these alarm messages.

NOTE

A load transfer to the bypass line will be completed whenever an automatic transfer to bypass is initiated and the bypass line is available. If the OK to Transfer condition is present, the load transfer will be uninterrupted. If the Static Switch Unable alarm message is present for any reason, the automatic transfer will be interrupted for 40 to 120 milliseconds. Because of the reliability of the UPS components, an interrupted load transfer is a very unlikely occurrence.

Some installations may include a Remote Emergency Power Off mode that can be initiated automatically by a contact closure in the critical load equipment. Refer to 2.14.6 - Remote Emergency Power Off.

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2.16.4 Automatic Retransfers to UPS

In an automatic retransfer, the two circuit breakers (bypass and inverter output) are both closed simultaneously for a short period of time (overlap).

The following critical bus conditions must be present to initiate an automatic retransfer of the critical load from the bypass source to the UPS inverter:

1. Critical load was initially transferred to the bypass source due to a system overload only. A manual retransfer from bypass is required if the transfer to bypass was caused by any condition other than output overload.

2. Overload has since dropped below 100% of the rated load.

3. Both the Input and the DC source (MBD) circuit breakers have remained closed since the overload transfer.

4. OK to Transfer signal received from the control logic for at least 10 seconds, within 5 minutes of the system overload transfer. A manual retransfer from bypass is required for overloads lasting 5 minutes or more.

5. Cyclic-type overloads, which occur up to five (select range is 0 to 5) times in 60 minutes, are automatically returned to the inverter for each event including the Nth overload.

NOTE

If you do not want the UPS system to initiate any automatic retransfers, this can be set during the initial commissioning or by calling your local Liebert Services representative.

Operation

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3.0 OPTIONS

NOTE

These items must be enabled by service before they become functional. If a feature is disabled, the feature will not be available and the menu item will not be displayed.

3.1 Input Contact Isolator Board

The Input Contact Isolator Board (ICI) provides a Liebert NXL module interface for up to eight external user alarm or message inputs to be routed through the NXL’s alarm network. The eight contacts are normally open dry contacts. When a contact closes, an event is triggered.

NOTE

Up to two (2) ICI’s can be installed in a Liebert NXL.

The Input Contact Isolator options are configured through the Input Contact Isolator dialog box, which is accessed from the Internal Option Settings under Config dialog box on the HMI touchscreen display. The Input Contact Isolator dialog box contains eight choices to match the eight channel input board. You can label each button to identify the event associated with the contact. When the dialog box is accessed, each button flashes to display the Input Contact Isolator number and the user entered label. This label also appears in the Display Panel when an event related to an Input Isolator Connector is triggered.

The Input Contact Isolator dialog box allows you to:

• Label the input contact assignments for your setup.

• Set the delay for an external event triggering an alarm.

• Review the isolator contact assignments, once the labels are entered.

The delay allows setting the number of seconds that a condition must exist before it will trigger an alarm. To configure the Input Contact Isolator relays:

1. Press Internal Option Settings from the Config menu.

2. Press which Input Contact Isolator is to be configured. The Input Contact Isolator dialog box is displayed.

Figure 48 Input contact isolator dialog box

Options

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• Assignment—Custom, Pre-assigned (default: “Input Contact” XY)

123 67894105 111213141516

J51

No Customer Connection

Table 2 Input Contact Isolator Board

control wiring connections

Input Contact Pin No.

1. Customer control wiring connection points are terminals 1 through 16 (see Table 2).

2. Customer provided normally open dry contacts for user alarm messages.

3. All control wiring (by others) must be run separate from power wiring. Control wiring runs should not be combined in the same conduit.

4. Signal voltage: 100mA @ 12VDC.

5. Maximum cable length 500 ft. (152m) with #16AWG and flexible stranded cable.

6. All wiring must be in accordance with national and local electrical codes.

• Delay, sec—0 to 99.9 (default: 0)

• Message—Custom: 0-19 characters

3. To assign labels for each channel: a. Press Pre-assigned for default labels on Channels 1-6 (See Table 1) b. For Custom labels

1. Press Custom to unique labels.

2. Click on Input Contact XX button. A keyboard is displayed to allow naming alarms.

3. Enter the name of the alarm set for that input. For example, a fan problem could be indicated by naming the button FAN.

4. Press OK on the keyboard to keep your label.

4. Press DELAY.

a. A keypad is displayed prompting you for a delay time, in seconds, for a condition to exist

before the alarm is triggered. b. Enter the delay value. The range for the values are from 0 (zero) to 99.9 seconds. c. Press OK on the keypad to keep your setting. The value you entered is displayed in the field

adjacent to the corresponding input contact.

5. Repeat Steps 3 and 4 for each input contact.

6. Press SAVE after you have configured all input contacts. Be sure to press Save even if you have accessed this dialog only to change a setting.

7. This information is not saved if control power is removed.

Table 1 Input Contact Isolator Board pre-assigned values

Channel

Number

Pre-Assigned Label

1 Reduced Rect ILimit Stop Battery Charge 2 Reduced Batt ILimit Stop Battery Charge 3 Stop Battery Charge Stop Battery Charge 4 Inhibit Rect Restrt Stop Battery Charge 5 Inhibit Byp Restrt Stop Battery Charge 6 Inhibit Inv Restrt Stop Battery Charge 7 Input Trap Filter Disconnect Inhibit IP Standby 8 Suspend ECO Mode

ICI #1

ICI #2

Pre-Assigned Label

Options

Figure 49 Optional Input Contact Isolator Board

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3.2 Programmable Relay Board

123 67 894105 111213141516

123 67894105 111213141516

123 6 7894105 11121314 1516

123

J74

J71

J72

J73

1. Customer control wiring connection points are terminals 1 through 15. (Pin 16 not used on J71, J72, and J73.)

2. Programmable Relay Board option includes eight signal channels with two Form-C dry contacts per channel (see Table 3).

3. All control wiring (by others) must be run separate from power wiring. Control wiring runs should not be combined in the same conduit.

4. Contact ratings: 1A @ 30VDC or 125VAC @ 0.45A

5. Maximum cable length 500 ft. (152m) with #16AWG and flexible stranded cable.

6. All wiring must be in accordance with national and local electrical codes.

The Programmable Relay Board (PRB) provides a means to trigger an external device when an event occurs in the Liebert NXL. Each PRB has eight channels. Each channel has Form-C dry contacts rated at 1A @ 30VDC or 125VAC @ 0.45A.

Any alarm/event can be programmed to any channel or channels. Up to four (4) events can be programmed to a relay. If multiple events are grouped to one relay, group the events logically to simplify troubleshooting when an event is triggered. The same alarm/event can be programmed to more than one channel. Up to two Programmable Relay Boards can be installed in the Liebert NXL for a total of 16 channels. Programming is performed through the HMI touchscreen display.

NOTE

Up to two (2) PRB’s can be installed in the Liebert NXL.

Figure 50 Control wiring, Programmable Relay Board

Options

Table 3 Programmable Relay Board pinout

Terminal

Block Channel Pin No. Common

CH1

J71

J72

TB3

J74 B 1-3 1 2 3

Note: Pin 16 not used on J71, J72, and J73.

CH2

CH3

CH4

CH5

CH6

CH7

CH8

A1-3 1 2 3

B4-6 4 5 6

A7-9 7 8 9

B 10-12 10 11 12

A 13-15 13 14 15

B1-3 1 2 3

A4-6 4 5 6

B7-9 7 8 9

A 10-12 10 11 12

B 13-15 13 14 15

A1-3 1 2 3

B4-6 4 5 6

A7-9 7 8 9

B 10-12 10 11 12

A 13-15 13 14 15

Normally

Closed

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3.2.1 Configuring the Programmable Relay Board Settings

1. Press Internal Option Settings from the Config menu.

2. Press which Programmable Relay Board will be configured. The Programmable Relay Board dialog box is displayed.

3. Press the Relay channel

4. Press up to four (4) events. Selected events will show up under Relay 1 Assignment.

NOTE

To deselect an event, click on the event.

5. Repeat Steps 3 and 4 for each relay.

6. Press SAVE to keep the settings.

Figure 51 Programmable relay board dialog box

Options

• Assignment—0 to 4 event (default: 0)

• Delay, sec—0 to 99.9 (default: 0)

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3.3 Remote Alarm Status Panel RAS

The Remote Alarm Status Panel (RAS) uses LED status indicators that allow the operator to monitor the UPS.

The main purpose of the Remote Alarm Status Panel option is to report the status of the load and the UPS. To interpret the LED indicators, see Table 4.

Table 4 RAS indicators

LED Name

Load on UPS Green

Load on Bypass Alarm Red

Battery Discharge Alarm Red The DC source is providing power to the UPS.

Low Battery Reserve Alarm Red DC source capacity is low and has reached the low-battery alarm setting.

Overload Red System load has exceeded the system rating.

Ambient Overtemp Red UPS inlet cooling air temperature has exceeded the specified limits.

System Summary Alarm Red An alarm has occurred at the UPS.

New Alarm Condition Red

LED Color Meaning

The load is fully protected and no alarm conditions are present. The UPS is supplying uninterrupted power to the load.

Power to the load is bypassing the UPS. The UPS is no longer supplying power to the load.

A second alarm has occurred at the UPS. The New Alarm Condition LED lights when the UPS Alarm Condition LED has been triggered and has not been reset.

Options

The RAS also includes:

1. An audible alarm

2. Lamp Test/Reset push button to test the LED indicators

3. Audio Reset push button to silence an audible alarm

3.3.1 Lamp Test/Reset Push button

The Lamp Test/Reset push button is used to verify that each LED indicator is in working condition and to reset an LED indicator that has been triggered by a condition at the load or UPS.

To test the LEDs, press the Lamp Test/Reset push button. This lights all of the LED indicators for visual inspection.

If an LED indicator does not respond to the lamp test, contact your local Emerson Network Power representative for assistance.

To reset an activated LED, press the Lamp Test/Reset push button.

3.3.2 Audio Reset Push button

The Audio Reset push button is used to silence an audible alarm that has been triggered and reset the alarm to activate on the next alarm condition.

After correcting the alarm condition, press the push button to reset the audible alarm.

3.4 Digital Load Bus Sync

3.4.1 System Description

Liebert’s Load Bus Sync Power Systems in synchronization, even when the systems are operating from different power sources. The Liebert LBS works by synchronizing the Designates Slave System (DSS) to the output of the Designated Master System (DMS). There are no other connections between the logic or controls of either UPS. This ensures maximum system independence and reliability.

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(LBS) option keeps the output of two or more independent Uninterruptible

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3.4.2 LBS Configurations

• Load Bus Sync – Enable or Disabled (default: Disable)

• LBS Master Select - Master or Slave (default: Slave)

NOTE

The LBS settings permit proper operation with only one UPS set as the Master unit.

• LBS Slave Priority – 0 to 7 (default: 0)

NOTE

Setting of ‘0’ will disable LBS Slave Priority

3.4.3 Normal Operations

The LBS will synchronize the Designated Slave Systems (DSS) to the Designated Master System (DMS). The DSS will synchronize to the DMS output if the DMS is in Normal, Battery, Bypass or Maintenance Bypass Mode

If the DSS transfers to Bypass Mode or Maintenance Bypass mode, the DMS will then synchronize to the output bus of the DSS. This re-selection of master will be accomplished automatically.

3.4.4 Slave Priority

When Slave Priority is enabled, the LBS system will work the same as Normal operations (See 3.4.2 LBS Configurations except when the DMS disqualifies it bypass source. If the DMS’s bypass is

disqualified, the LBS system will synchronize to the output of the DSS with the lowest Slave Priority number that has a qualified bypass. The LBS system will synchronize back to the DMS when the DMS’s bypass is qualified or all DSS’s bypass are disqualified.

If a DSS LBS Slave Priority is set to “0”, it will not assume the synchronization of the system if the DMS disqualifies its bypass.

Options

Figure 52 LBS configuration

3.4.5 Master System

The unit designated at power-up/reset to be the Master will monitor the LBS Sync Pulse line. If two units are designated as Master, the second designated Master Unit to come on-line will inhibit

the LBS and synch to its own bypass. The LBS Master will monitor the LBS Sync Pulse continuously; if the LBS Master detects that

another unit has transferred to bypass, the LBS Master will follow the unit on bypass.

• Slave can no longer follow the Master; the Master must follow the Slave. When the Master unit is following a Slave LBS Sync Signal, it will generate the LBS Active event. If the Slave LBS Sync Pulse stops, the Master will resume generating the LBS Sync Pulse.

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3.4.6 Slave System

Any unit designated as the Slave upon power-up / reset will monitor and lock to the Master LBS Sync Pulse.

When the Slave unit is on bypass, the Slave will generate the LBS Sync Pulse.

• The Slave will slew to be locked to its own bypass source. The inverter in the LBS Slave system

will follow the local bypass.

• When the Slave unit is on UPS, the Slave will stop generating the LBS Sync Pulse.

When more than one Slave unit goes to bypass:

• All systems on UPS will follow the first Slave’s LBS Sync Pulse

• All other Slave systems on Bypass will follow their own local Bypass Source.

3.5 ECO Mode

ECO Mode improves the overall efficiency by powering the critical bus from the bypass static switch instead from the inverter.

3.5.1 ECO Mode Setup

ECO Mode Operation—To enable or disable ECO mode via the front touchscreen.

• Enable, Disable

• Default: Disabled

Options

Maximum Auto Suspensions—Used to specify how many times the system is allowed to automatically reactivate ECO Mode before the current ECO Mode session is terminated and Excessive ECO Mode Suspension event is set.

• Min., 1; Max., 5; Iteration, 1

•Default, 3

Restart Delay—Used to specify how long the conditions to activate must be satisfied before reactivating ECO Mode. Once Automatic Reactivation has been satisfied, the conditions must remain satisfied for the full Restart Delay before ECO Mode is active.

• Min., 10 minutes; Max., 60 minutes; Iteration, 10 minutes

• Default, 30 minutes

Continuous Operation—Permits running ECO Mode continuously through the Start command and Stop command.

• Enable, Disable

• Default: Disabled

Figure 53 ECO Mode settings

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3.5.2 Operation

ECO Mode can be started either manually or automatically.

Manually—If “Continuos Operation” is enabled under ECO Mode - Operations, pressing Start will activate ECO Mode.

Automatically—If ECO Mode schedule has been programmed (see Figure 54), the system will start ECO Mode at the next scheduled start time.

• Schedule Entry Enable: Permits enabling or disabling an Schedule Entry Action Start entry in

the operation schedule

•Enable, Disable

• Default: Enable

• Schedule Entry Day of the Week: Permits choosing the day of the week for an associated schedule

entry action to take effect

• Sun, Mon, Tues, Wed, Thurs, Fri, Sat

•Default: Sun

• Schedule Entry Time: Permits choosing the time of day for an associated schedule entry action to

take effect.

• hh:mm (24-hour clock)

• Default: 00:00

• Schedule Entry Action: Permits choosing the action an associated schedule entry will take.

•Start, Stop

• Default: Start (1st entry), Opposite of previous entry afterwards

Options

Figure 54 ECO Mode scheduling—overall and example

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3.5.3 Bypass Qualification limits

All of the following conditions must be true to qualify ECO Mode operations based on the bypass source:

• Bypass voltage is within Manual Transfer Bypass Voltage High Limit setting and Manual

Transfer Bypass Voltage Low Limit setting or Max Bypass range of ±10%

• Bypass Frequency is within the Bypass Tracking Window setting

• Bypass is within the slew limits per Bypass Tracking Slew Rate setting

• Bypass Sync Error event is not active

• Backfeed Breaker is closed

• Bypass Static Switch Unable event is not active

3.5.4 Conditions to Activate ECO Mode

All the following conditions must be satisfied to start ECO Mode

• ECO Mode Session is active

• Bypass Source Qualification is satisfied

• The Load On UPS event must be active for a short, specified amount of time

• Input Contact Interface 1 (Channel 8) event is not active

• Load is greater than 10%

3.5.5 Conditions to Suspend ECO Mode

Options

The system will suspend ECO Mode when at least one of the following conditions is true:

1. Bypass Source Qualification is not satisfied.

2. Input Contact Interface 1 (Channel 8) event active.

3. On Generator Active event is active.

4. Load kW is less than 10%.

When any Conditions to Suspend have been satisfied, the inverter(s) will power the load and the bypass will be turned off. When the Conditions to Activate ECO Mode (Section 3.5.4) have been met, the system will automatically return to ECO Mode.

3.5.6 Conditions to Terminate ECO Mode

The system will terminate ECO Mode when at least one of the following conditions is true:

1. ECO Mode - Stop command is received.

2. Scheduling stop time is reached.

3. Excessive ECO Mode Suspension event is set.

4. ECO Mode Operation setting is disabled.

5. System transfers to bypass, either automatically or manually.

6. Backfeed Breaker Open event is active.

7. Bypass Static Switch Unable event is active (SCR Short, SCR Open).

8. Inverter Output Breaker (CB2/IOB) Open event is active.

9. Module Output Breaker (MOB) Open event is active.

10. Critical Bus Voltage Disqualification is satisfied.

11. Bypass Line Fault or Critical Bus Load Fault detected.

When any Conditions to Terminate have been satisfied, the inverter(s) will power the load and the bypass will be turned off. ECO Mode will not turn on until the next Start command - either manually or automatically if scheduled.

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3.6 Intelligent Paralleling

Intelligent Paralleling is intended to increase system efficiency and reduce operating hours on the modules. Intelligent Paralleling will put one or more paralleled modules into standby operation when the number of redundant modules is above the user specified threshold.

3.6.1 Intelligent Paralleling Setup

Operation

• Enable, Disable

• Default: Disabled

Minimum System Redundancy—Permits setting the redundancy threshold at which Intelligent Paralleling will operate. This is the minimum Number of Redundant Modules that the system will allow before bringing one or more modules back to normal operation and terminating Intelligent Paralleling.

• Min: 0; Max: Number of Modules - 1; Iteration: 1

•Default: 1

Maximum Time Module In Standby—Permits cycling a module that has had Intelligent Paralleling active the longest with another module currently in normal operation after the selected amount of time. After the cycle is successful, the new module that has had Intelligent Paralleling active the longest will go into standby mode. Disable this feature by selecting 0 days.

• Min: 0 Days; Max: 30 Days; Iteration: 1 Day

• Default: 30 Days

Options

Shutdown Delay—Permits choosing how long a module should wait before Intelligent Paralleling is active and module is in standby.

• Min. 5 minutes; Max. 60 minutes; Iteration 1 minute

• Default: 5 minutes

NOTE

These are global settings. The settings only have to be configured from one module.

Figure 55 Intelligent Paralleling settings

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3.6.2 Intelligent Paralleling Target Area

The Intelligent Paralleling Target Area is the Number of Redundant Modules that fall between the Minimum System Redundancy setting and the internal Maximum System Redundancy (Minimum System Redundancy + 1.25).

• The Maximum Number of Redundant modules is designed to provide hysteresis so that modules

are not started and stopped when the load oscillates a few percentage points.

• When the Number of Redundant Modules goes above the Target Area, the system puts one or

more modules into standby operation until the Number of Redundant Modules is inside the Target Area.

• When the Number of Redundant Modules goes below the Target Area, the system puts one or

more modules back into normal operation until the Number of Redundant Modules is inside the Target Area or all available modules are supporting the load.

3.6.3 Conditions to Activate Intelligent Paralleling

All of the following conditions must be true for the system to activate Intelligent Paralleling

• Intelligent Paralleling is enabled.

• The Number of Redundant Modules is above the Intelligent Paralleling Target Area for longer

than the Shutdown Delay setting.

• The Critical Load is on UPS.

• The module is part of the collective.

• No modules are on DC source.

• The module is selected as the next module to activate Intelligent Paralleling.

• Input Contact Interface 2 (Channel 7) event is not active

Options

3.6.4 Conditions to Suspend Intelligent Paralleling

Suspend Intelligent Paralleling for a Module

At least one of the conditions below must be true for the module to terminate Intelligent Paralleling at a module and return the module to normal operation:

• Intelligent Paralleling is disabled.

• The Number of Redundant Modules is below the Intelligent Paralleling Target Area.

• One or more modules is on DC source.

• Module is removed or user has issued a UPS/System shutdown.

• All Module Termination is initiated.

• Maximum Time Module In Standby has expired.

• Inhibit IP Standby (Input Contact Interface 2, Channel 7) event active.

Suspend Intelligent Paralleling for the system

Any of the following conditions will terminate Intelligent Paralleling and place all modules in normal operation:

• All modules transfer to bypass

• System overload

• One or more modules go on DC source

3.6.5 Intelligent Paralleling Module Selection

Intelligent Paralleling Module Activation

The next module chosen to activate Intelligent Paralleling and put into standby operation will be done by cycling through the Module Numbers, starting with Module 1.

• The module chosen to be next must be a part of the collective (load on UPS). Otherwise, this

module will be skipped.

• When the last Module Number is chosen, the next module will be Module 1 (start cycle over).

Intelligent Paralleling Module Termination

The next module chosen to terminate Intelligent Paralleling normally and put back into normal operation will be done by selecting the module that has had Intelligent Paralleling active the longest.

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3.6.6 Module Standby Rotation

Module Standby Rotation will limit the time a module is in standby operation when the Number of Redundant Modules doesn't change for a long period.

• The module selected as the next to terminate Intelligent Paralleling per Module Selection -

Termination, (see Intelligent Paralleling Module Termination on page 65), will not be in standby operation for longer than Maximum Time Module In Standby (see 3.6.1 - Intelligent Paralleling Setup).

• When this time expires, the module will terminate Intelligent Paralleling and come back online.

• The next module selected to activate Intelligent Paralleling will be put into standby operation.

NOTE

When Maximum Time Module In Standby setting is 0, Module Standby Rotation is disabled.

Options

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Figure 56 Module standby rotation

Load

UPS1 UPS2 UPS3 UPS4 UPS5

UPS1 UPS2

Load

UPS3 UPS4 UPS5

Load

UPS1 UPS2 UPS3 UPS4 UPS5

Load

UPS1 UPS2 UPS3 UPS4 UPS5

Load

UPS1 UPS2 UPS3 UPS4 UPS5

After Maximum Time Module in Standby setting time

Options

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4.0 MAINTENANCE

4.1 Safety Precautions

Observe the safety precautions in Battery Cabinet Precautions inside the front cover.

NOTE

Service and maintenance work must be performed only by properly trained and qualified personnel and in accordance with applicable regulations as well as with manufacturers’ specifications.

Observe ALL of the WARNINGS below before performing ANY maintenance on the UPS System and associated equipment. Also observe the manufacturer’s safety precautions pertaining to the DC source, along with the DC source safety precautions in this section.

WARNING

Risk of electrical shock and high short circuit current. Can cause equipment damage, personal injury and death.

Extreme caution is required when performing maintenance. Be constantly aware that the UPS system contains high DC as well as AC voltages. With

input power off and the DC source disconnected, high voltage at filter capacitors and power circuits should be discharged within 5 minutes. However, if a power circuit failure has occurred, you should assume that high voltage may still exist after shutdown. Check with a voltmeter before making contact.

AC voltage will remain on the bypass and output circuit breakers and the static bypass switch, unless associated external circuit breakers are opened.

Check for voltage with both AC and DC voltmeters prior to making contact. When the UPS system is under power, both the operator and any test equipment must be

isolated from direct contact with earth ground and the UPS chassis frame by using rubber mats.

Some components within the cabinets are not connected to chassis ground. Any contact between floating circuits and the chassis is a lethal shock hazard. Use differential

oscilloscopes when measuring a floating circuit. Exercise caution that the test instrument exterior does not make contact, either physically or

electrically, with earth ground. In case of fire involving electrical equipment, use only carbon dioxide fire extinguishers or

others approved for use in fighting electrical fires.

Maintenance

Liebert® NXL

WARNING

Risk of electrical shock and high short circuit current. Can cause equipment damage, personal injury and death.

Always identify connecting wiring prior to disconnecting any wiring. Do not substitute parts except as authorized by Emerson Maintain the UPS cabinets free of foreign materials such as solder, wire cuttings, etc. Contact Liebert Services if you are not sure of the procedures to follow or if you are not

familiar with the circuitry.

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4.2 Liebert Services

Startup, UPS maintenance, DC source maintenance and training programs are available for the Liebert NXL UPS through your Liebert sales representative.

4.2.1 Professional Startup

UPS Startup—Liebert’s customer engineers perform a thorough non-powered inspection of the units and will then conduct a complete electrical checkout. The DC source installation is also inspected and placed on an initialization charge to ensure cell equalization. Customer Operation training will be conducted during DC source charge time.

Load bank testing and full site acceptance testing are additional services that can be performed during a UPS startup. One preventive maintenance service call can be added to the initial UPS startup agreement.

Battery Installation/Startup—When purchased with a UPS Startup, this Agreement provides consistent, professional service for your entire UPS system. This one-source approach avoids conflicts that may occur during a multisource installation. Note that Liebert requires a mandatory installation inspection for all batteries not installed by Liebert customer engineers.

Battery IEEE Certification Inspection—The Battery Specialist will perform a detailed inspection of the entire battery system to ensure it meets current IEEE standards.

Maintenance Agreements: The Signature Program

UPS Service Agreements—Liebert Services has a variety of available maintenance agreements, depending on specific site needs. Choose the level of support appropriate for each installation.

Maintenance

Mission-critical sites can have the standard parts-and-labor, around-the-clock coverage for their UPS, with or without scheduled preventive maintenance visits. Other sites can benefit from a variety of money-saving options.

Emerson

recommends two preventive maintenance visits per year for the UPS. The first can be

conducted with the UPS operational and includes an infrared scan of key UPS components.

The annual visit will require taking the UPS off-line for a thorough non-powered inspection.

These visits are in addition to the general housekeeping tasks (changing air filters, etc.) that can be performed by customer personnel.

Battery Service Agreements—The same flexible Signature Program can also be applied to contracts for battery maintenance. Again, the coverage needed will depend on the type of battery purchased and the degree of support required from Liebert Services.

Training

Customer training courses include the proper operation of the system, emergency procedures, preventive maintenance and some corrective maintenance.

Warranties

Contact Liebert Services if you have any questions regarding the warranty on your Liebert NXL UPS or the batteries.

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4.3 Routine Maintenance

You should become thoroughly familiar with the equipment, but at no time should you go beyond the specific procedures in this manual while performing maintenance or correcting a malfunction.

If you have any doubt as to what must be done, call Liebert Services at 1-800-LIEBERT for further instructions.

NOTE

Service and maintenance work must be performed only by properly trained and qualified personnel and in accordance with applicable regulations as well as with manufacturers’ specifications.

The UPS is designed for unattended operation, but does require some common-sense maintenance.

• Keep good records—Troubleshooting is easier if you have historical background.

• Keep it clean—Maintain the UPS free of dust and any moisture.

• Keep it cool—Battery systems must be kept in the range of 72-77°F (22-26°C) in order to meet

design specifications for capacity and longevity. The UPS will reliably meet all performance specifications and design life at temperatures up to

104°F (40°C). However, performance and longevity will be optimized when the UPS is operated at the same temperature as the batteries. Contact your local Liebert sales representative or call 1-800-LIEBERT for further details.

• Keep connections tight—Tighten all connections at installation and at least annually

thereafter (see torque requirements, Table 7.)

• Keep it inspected—Periodically inspect external upstream and downstream circuit breakers to

assure that the trip current settings are correct. Become familiar with typical ambient conditions surrounding equipment so that abnormal

conditions may be more quickly recognized. Know what typical meter readings are and where adjustable settings should be.

Maintenance

4.3.1 Record Log

Set up a maintenance log to record scheduled checks and any abnormal conditions.

The log should have space for all metered parameter indications including phase readings, alarm messages, UPS mode of operation, air filter replacement date and observation notes. A second log should be maintained for the DC source as directed by the DC source manufacturer.

A periodic walk-through inspection of the UPS and DC source rooms is advised to check for visible and audible indications of problems. Log the inspection, metered parameter indications and any discrepancies.

4.3.2 Air Filters

The air filters must be inspected and serviced on a regular schedule. The period between inspections will depend upon environmental conditions. Under normal conditions, the air filters will require cleaning or replacement approximately every two months. Abnormal or dusty conditions will require more-frequent cleaning and replacement of air filters. Inspect installations in new buildings more often, then extend the inspection period as experience dictates.

All NXL models have a replaceable air filter located inside the front doors. These filters can be changed while the UPS is in operation.

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4.3.3 Limited Life Components

The Liebert NXL UPS has a design life well in excess of 10 years. Well-maintained units can continue to provide economic benefits for 20 years or more. Long-life components are used in the UPS wherever practical and cost-effective. However, due to the currently available component material, manufacturing technology limitations and the general function and use of the component, a few components in your Liebert UPS will have a shorter life cycle and require replacement in less than 10 years.

The following components utilized in your UPS system have a limited life cycle and are specifically exempt from warranty. To prevent a wear-out failure of one of these components affecting your critical load operations, Liebert recommends these components be periodically inspected and replaced before the expected expiration of their life cycle. The expected life of each component listed below is simply an estimate and is not a guarantee. Individual users may have site-specific requirements, maintenance and other environmental conditions that affect the length of the component's useful life cycle.

Table 5 UPS component service life

Component Expected Life Replace in:

Power AC filter capacitors > 7 years (~62,000 hours) 5 to 6 years

Power DC filter capacitors > 7 years (~62,000 hours) 5 to 6 years

Low-profile fans > 7 years (~62,000 hours) 5 to 6 years

Air filters 1 to 3 years Check four times per year

Battery, lithium logic memory backup

Battery, storage

Lead-acid wet-cell (user selection) 10 to 20 years 12 to 15 years

Valve-regulated, lead-acid (VRLA)

Maintenance

10 years (~87,600 hours) 8 to 9 years

5 years 2 to 3 years

10 years 4 to 5 years

20 years 8 to 12 years

In most cases, replacement components must exactly match the original component specifications. These replacement components are not readily available from third-party component distributors. For assistance with your specific component specifications, replacement component selection and sourcing, call 1-800-LIEBERT. For customers using Liebert Services’ preventive maintenance services, periodic inspection of these components is part of this service, as well as recommending component replacement intervals to customers to avoid unanticipated interruptions in critical load operations.

4.4 Battery Maintenance

WARNING

Risk of electrical shock and high short circuit current. Can cause equipment damage, personal injury and death.

These maintenance procedures will expose hazardous live parts. Refer servicing to properly trained and qualified personnel working in accordance with applicable regulations as well as with manufacturers’ specifications.

DC fuses operate at the rated battery voltage at all times. A blown DC bus fuse indicates a serious problem. Serious injury or damage to the equipment can result if the fuse is replaced without knowing why it failed. Contact Liebert Services for assistance.

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4.4.1 Battery Safety Precautions

Servicing of batteries should be performed or supervised by personnel knowledgeable of batteries and the required precautions. Keep unauthorized personnel away from batteries.

When replacing batteries, use the same number and type of batteries.

WARNING

Risk of electric shock, explosive reaction, hazardous chemicals and fire. Can cause equipment damage, personal injury and death.

Lead-acid batteries contain hazardous materials. Batteries must be handled, transported and recycled or discarded in accordance with federal, state and local regulations. Because lead is a toxic substance, lead-acid batteries must be recycled rather than discarded.

Do not dispose of battery or batteries in a fire. The battery may explode. Do not open or mutilate the battery or batteries. Released electrolyte is harmful to the skin

and eyes. It is toxic.

WARNING

Risk of electrical shock and high short circuit current. Can cause equipment damage, personal injury and death.

The following precautions must be observed when working on batteries:

• Remove watches, rings and other metal objects.

• Use tools with insulated handles.

• Wear rubber gloves and boots.

• Do not lay tools or metal parts on top of batteries.

• Disconnect charging source prior to connecting or disconnecting battery terminals.

• Determine whether the battery is grounded. If it is grounded, remove source of ground. Contact with any part of a grounded battery can result in electrical shock. The likelihood of such shock will be reduced if such grounds are removed during installation and maintenance.

Maintenance

Lead-acid batteries can present a risk of fire because they generate hydrogen gas. In addition, the electrical connections must be protected against accidental short circuits which can cause sparks. The following procedures should be followed:

• DO NOT SMOKE when near batteries.

• DO NOT cause flame or spark in battery area.

• Discharge static electricity from body before touching batteries by first touching a grounded metal surface.

• After replacing battery jars in a battery cabinet, replace the retaining straps that hold the jars in place on the shelves. This will limit accidental movement of the jars and connectors should the cabinet ever need to be repositioned or relocated.

Regular maintenance of the battery module is an absolute necessity. Periodic inspections of battery and terminal voltages, specific gravity and connection resistance should be made. Strictly follow the procedures outlined in the battery manufacturer’s manual, available on the manufacturer’s Web site.

Valve-regulated lead-acid (sealed-cell) batteries do require periodic maintenance. Although maintenance of electrolyte levels is not required, visual inspections and checks of battery voltage and connection resistance should be made.

NOTICE

Risk of equipment damage. Batteries should be cleaned with a dry cloth or a cloth lightly moistened with water. Do not use cleaners on the batteries. Solvents can make the battery cases brittle.

Because individual battery characteristics are not identical and may change over time, the UPS module is equipped with circuitry to equalize battery cell voltages. This circuit increases charging voltage to maintain flooded type battery cells at full capacity.

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Maintenance

WARNING

Risk of electric shock, explosive reaction, hazardous chemicals and fire. Can cause equipment damage, personal injury and death.

Do not use equalize charging with valve-regulated, lead-acid batteries. Refer to the battery manufacturer’s manual, available on the manufacturer’s Web site, for specific information about equalize charging.

Matching Battery Cabinets—Optional

Although the individual battery cells are sealed (valve-regulated) and require only minimal maintenance, the Battery Cabinets should be given a periodic inspection and electrical check. Checks should be performed at least annually to ensure years of trouble-free service.

Voltage Records: With the Battery Cabinet DC circuit breaker closed and the connected UPS operating, measure and record battery float voltage. With the DC circuit breaker open, measure and record the nominal (open circuit) voltage. Both these measurements should be made across the final positive and negative terminal lugs. Compare these values with those shown below. The recorded nominal voltage should be no less than the value shown; while the recorded float voltage should be within the range shown. If a discrepancy is found, contact Liebert Services.

Table 6 Battery voltage, nominal and float

Battery Voltage, VDC

Number of Cells

240 480 527 - 552

Nominal Float

Power Connections: Check for corrosion and connection integrity. Inspect wiring for discolored or cracked insulation. Clean and/or retighten as required. Refer to torque specifications in Table 7.

Battery Cell Terminals: Check for discoloration, corrosion and connection integrity. Clean and tighten if necessary. Note that when installing a new battery, the initial torque value is 5 lb.-in. more than the retorque value. Table 7 shows battery retorque values.

Table 7 Battery retorque values

Battery Mfr. Battery Model # Retorque Value

UPS12-300MR 110 in-lb UPS12-350MR 110 in-lb

C&D

Enersys

East Penn

UPS12-400MR 110 in-lb

UPS12-490MRLP 110 in-lb

UPS12-540MR 110 in-lb

HX205-FR 65 in-lb HX300-FR 65 in-lb HX330-FR 65 in-lb HX400-FR 65 in-lb HX500-FR 65 in-lb

HX540-FR 65 in-lb 16HX800F 100 in-lb 16HX925F 100 in-lb 24HR3000 65 in-lb 27HR3500 65 in-lb 31HR4000 65 in-lb 31HR5000 65 in-lb

If the system uses a different model battery, contact Liebert Services for the required torque value.

To access battery cell terminals, disconnect the inter-tier cable and two shelf retaining screws. Once disconnected, insulate (with protective boot or electrical tape) the cables to prevent accidental shorts. The battery shelf can now be pulled out. Tighten each terminal connection to the retorque value. When replacing a battery, the terminal connections must be cleaned and tightened. Disconnect and insulate the cables connected to the battery. Secure each battery shelf with retaining screws when maintenance is complete.

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Other DC Sources

If the UPS system uses a DC source other than a factory-supplied Matching Battery Cabinet, perform maintenance on the DC source as recommended in the DC source manufacturer’s maintenance manual, available on the manufacturer’s Web site.

4.5 Detecting Trouble

It is important that the operator check the instrument readings if abnormal equipment performance is suspected. Any metered value that differs appreciably from normal could mean an impending malfunction and should be investigated.

Items to check include:

• If the UPS has not operated on battery power during the last 10 hours, the batteries should require little charging current. Battery mimic should indicate normal DC voltage with the battery charge current no more than 1% of maximum discharge current.

• Input current on each phase should be within 10% of the average input current.

• Alarm messages indicate malfunction or impending malfunction. A daily check of the Display Screen will help to provide an early detection of problems. Refer to Table 10 for information about interpreting alarm messages.

• Tracing a problem to a particular section is facilitated by alarm messages and the metered parameter indications.

NOTICE

Maintenance

If the UPS system has an open fuse, the cause should be determined before replacing the fuse. Contact Liebert Services for assistance.

4.6 Reporting a Problem

If a problem occurs within the UPS, review all alarm messages along with other pertinent data. Contact Liebert Services at 1-800-LIEBERT to report a problem or to request assistance.

4.7 Corrective Actions

The recommended corrective action for each alarm message on the Display Screen is in Table 10.

4.8 Upstream Feeder Circuit Breaker Setting Inspections

During normal UPS operations, short-term overload current demand from the bypass source may reach 10 times the UPS output current rating. This overload current demand may be caused by the magnetizing inrush current of one or more downstream transformers (i.e., power distribution units) or faults on downstream branch circuits. The instantaneous trip point(s) of the upstream bypass feeder breaker(s) must be set to support these temporary overloads. The magnitude of short-term overload bypass current demand is typically six to eight times the UPS current rating, but must be determined by analysis on a per-site basis. This analysis, generally known as an End-to-End Fault Coordination Study, must be done by a registered professional engineer experienced in this activity and familiar with local codes and related requirements.

Emerson settings, as well as the module input (rectifier) feeder breaker trip settings, to ensure that they are correct. For a variety of reasons, although typically during circuit breaker maintenance procedures by others, trip settings have been known to be inadvertently left improperly set. Correct trip setting of these circuit breakers is most important to achieving high-availability from your Liebert UPS system. For further information regarding proper trip settings for your feeder breakers, call 1-800-LIEBERT.

highly recommends periodic inspections of the bypass feeder breaker instantaneous trip

Liebert® NXL

NOTE

The instantaneous trip setting of the breaker feeding the UPS bypass input should be high enough to accommodate short-duration overloads. The bypass static switch power path inside the UPS can draw up to 10 times the system’s rated current for up to three cycles.

NOTE

While Emerson settings outside the Liebert-manufactured UPS equipment resides with the owner. Contact Liebert Services at 1-800-LIEBERT for further details.

™

can provide typical guidelines, the responsibility for the proper breaker trip

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5.0 SPECIFICATIONS

5.1 DC Sources

5.1.1 Battery Operation

The separate battery manufacturer’s manual, available on the manufacturer’s Web site, provides the necessary information for the installation, operation and maintenance of the battery. Use the battery manual in conjunction with this manual.

The float charge voltage for a battery is equal to the number of cells in series making up the battery multiplied by the charge voltage for each cell.

Because the charging voltage level is critical to proper battery operation, refer to your battery manual, available on the manufacturer’s Web site, for information about your system.

For models with nominal 240-cell battery, the DC bus nominal float voltage range is 2.15 to 2.30VPC. Maximum equalize voltage is 2.45VPC. The number of battery cells required ranges from 228 to 246, depending on the application.

5.2 Other DC Sources

The separate DC source manufacturer’s manual, available on the manufacturer’s Web site, provides the necessary information for the installation, operation and maintenance of the DC source. Use the DC source manual in conjunction with this manual.

5.3 Environmental Conditions

Table 8 Environmental specifications

Parameter Specification

Enclosure

Recommended Operating Temperature, °F (°C)

Maximum Operating Temperature, °F (°C)

Minimum Operating Temperature, °F (°C)

Storage Temperature, °F (°C) -13 to 158 (-25 to 70)

Typical Battery Temperature Requirements

Relative Humidity 0 to 95% without condensation

Operating Elevation Sea level to 4900 ft. (1500m) without derating

Storage Elevation Sea level to 50,000 ft. (15,240m)

The UPS is housed in a NEMA-1 enclosure. The enclosure is designed for indoor use only and is not to be subjected to falling objects or precipitation.

77 (25) ambient

104 (40) ambient (design temperature) without derating; (see Notes 2 and 3).

0°C

Average annual temperature must not exceed 80°F (27°C). Peak temperature must not exceed 109°F (43°C). See battery manufacturer’s recommendations.

Specifications

Audible Noise, 5 Feet (1.5m) from Unit

68 dBA typical

Notes on Environmental Specifications

1. This category of electronic equipment is agency rated for use in an atmosphere free of conductive particles. Some industrial facilities may require a room air filtration system to keep the UPS free of excess moisture and contaminants.

2. The UPS system is designed to operate continuously at 104°F (40°C). However, design equipment life expectancy will be extended with lower temperatures (25°C is recommended).

3. Ambient temperature is the maximum ambient temperature during any 24-hour period. For operation at higher temperatures, consult your Liebert sales representative or call Liebert Services at 1-800-LIEBERT.

4. Exercise care during installation to ensure unimpeded airflow through the UPS.

5. For operation at higher elevations, consult your Liebert sales representative or call Liebert Services at 1-800-LIEBERT.

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Table 9 Electrical specifications

Input Parameters

Input Voltage to Rectifier, VAC,

3-phase, 3-wire

Input Voltage to Bypass, VAC, 3-phase,

3- or 4-wire

Input Voltage Range, VAC +10% to -30%

Input Frequency, Hz 60

Permissible Input Frequency Range,

Reflected Input THDi at nominal

voltage at full load, %

Rectifier Power Walk-In, sec 1 to 30 (selectable) in 1 sec. Increments

DC Parameters

Battery Type VRLA (Valve Regulated Lead Acid) or FLA (Flooded Lead Acid)

Nominal DC Bus, VDC 480V

DC Float Voltage, VDC 540V

End-Cell Voltage, VDC 384–502 (for VRLA / FLA)

DC Ripple Voltage in Float and Const V

Ch. mode, %

Output Parameters

Inverter Type IGBT-based Sine-Sine PWM Controlled

Output Voltage, 3-phase, 4-wire 480V/575V/600V

Output Voltage Regulation, % < 1% (3-phase RMS average)

Output Voltage Regulation (Unb. Load) < 2% (3-phase RMS average)

Output Frequency, Hz 60

Output Frequency Regulation, % ± 0.1

Output THDu at Nominal Voltage

(Linear Load), %

Output THDu at nominal voltage

Including a 100kVA Non Linear Load

per EN 62040-3, %

Capacity to Handle Step Load, % 0-100 or 100-0

Transient Recovery

(Linear Loads),

, msec

within 5% peak to peak in one-line cycle

Capacity to Handle Leading PF Load

0.9 lag to Unity Subject to maximum kW rating

at 0.95 Lead Subject to maximum. kW rating

at 0.9 Lead Subject to 12,5% kW derate or same rating and 10°C temp. derate

Voltage Displacement, ° el 120° ±1° el (with unbalanced load)

Compliance to

Overload Conditions, % FL

(with DC source available)

Liebert NXL Model Size

FCC Class-A Standard

105% for 85 minutes; 110% for 60 minutes;

125% for 10 minutes; 150% for 1 minute

250 300 400 500 625 750 1100

Physical Parameters & Standards, in (mm)

with Static Bypass

Width

without Static Bypass

Depth

Height

71.8

(1823)

———

33.5

(850)

76.8

(1950)

78.5

(1993)

33.5

(850)

76.8

(1950)

480V/575V/600V

55 to 65

250-400kVA: <10% 500-1100kVA: <5%

<1 (RMS value) < 3.4% Vpp

<2%

2.5% (max)

78.5

(1993)

111.6

(2835)

140.5

(3569)

111.6

39.4

(1000)

76.8

(1950)

(2835)

39.4

(1000)

76.8

(1950)

(3175)

(1000.7)

(1950)

125

39.4

76.8

Specifications

140.5

(3569)

125

(3175)

39.4

(1000)

76.8

(1950)

228.3

(5799)

197.5

(5016.5)

46.1

(1170.9)

78.7

(1999)

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Table 9 Electrical specifications (continued)

Weight, unpackaged, lb (kg) approx.

3965

with Static Bypass (SMS)

with Static Bypass (1+N)

without Static Bypass (N+1)

Front Door Opening (for serviceability) More than 180°

Degree of Protection for UPS

Enclosure

Standards & Conformities

1. Width dimensions are with side panels attached. Subtract 1.4" (35mm) for dimensions with both side panels removed.

2. The depth dimensions include the front door and rear panel.

(1798)

4,040

(1,833)

———

4840

(2195)

4,915

(2,229)

6280

(2849)

6,380

(2,894)

IP 20 (with and without front door open)

IEC62040-2, Level 4, Criteria A EN61000-4-3, Level 3, Criteria A EN61000-4-6, Level 4, Criteria A

EN61000-2-2, Criteria A

EN61000-4-4, Level 4, Criteria A

ANSI C62.41, Category A3 &B3

10,310

(4677)

10,410 (4,722)

10,210 (4,631)

UL 1778, 4th Edition

CSA 22.2 107.3

FCC Part 15, Class A

ISTA Procedure 1H

WEEE

13,650

13,100

13,800

(6192)

(5942)

(6260)

13,650

(6192)

13,100

(5942)

13,800

(6260)

Specifications

21,450

(9730)

21,800

(9888)

20,050

(9095)

Disclosures with Regard to Embedded Software Licensed from Nokia, Inc., (“Sublicensed Software”)

1. Limits on Use, Distribution and Derivative Works: User is not given any rights to modify or create derivative works based on Sublicensed Software, or reproduce Sublicensed Software, or distribute any copies of Sublicensed Software, or disclose any Sublicensed Software to any third party, or decompile, disassemble or otherwise reverse engineer Sublicensed Software, or use any information learned therefrom. User acknowledges that Nokia, Inc., and its licensors own the copyrights and other intellectual property in and to the Sublicensed Software.

2. Responsibility of User: The Sublicensed Software is not designed, intended or licensed for use in or with systems, devices or products intended for surgical implant into the body or other applications intended to support or sustain life or for any aviation or nuclear reactor. It is User's responsibility to ascertain the suitability of Sublicensed Software for any situation or application.

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Specifications

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UPS Alarm and Status Messages

APPENDIX A-UPS ALARM AND STATUS MESSAGES

Table 10 shows alarm and status messages as they appear in the Liebert NXL’s touchscreen and in the history log, along with a description and recommended actions, if any.

If the recommended action fails to correct the condition, contact your factory-authorized service provider.

The “Service Telephone Number” can be found by pressing “CONFIG,” “Ratings,” “More>>” on the menu bar.

NOTE

In Event log, take the number for the “Data” Column. Convert that number from Decimal to Hex. Each digit will explain the reason for the Inhibit signals.

Example: Data = 512d =0200h->“Removing Module will cause Overload or Drop the Load”

Table 10 Liebert NXL alarm and status messages

Event Message Event Definition Recommended Action

An Automatic Restart was enabled, but has failed to complete. With Automatic Restart enabled, the unit automatically restarts after an End of Discharge (EOD) event. This alarm means that one of the auto restart requirements was true, but failed before the restart sequence completed.

Auto Restart Fail

Auto Rexfer Failed

Bat Mon 1 Critical Battery Monitor 1 is reporting a critical alarm.

Bat Mon 1 Maint

Batt CB“#” Open

For example, one conditional requirement for Automatic Restart to occur is that the Rectifier Input Voltage must be within acceptable limits. If, during the restart sequence, the input voltage drops out of tolerance, the Automatic Restart will fail. This alarm is self-clearing. When the condition is no longer present, the alarm and any control activity tied to the alarm reverts to normal.

The condition that caused the system to automatically disconnect the inverter from the critical bus has failed to clear within a specified time delay. An example of a recoverable condition (one which the controls may attempt to recover from automatically) is an overload that exceeded the overload capability.

Battery Monitor 1 has an active Maintenance Alarm.

Battery Circuit Breaker “#” is open. This status message is self-clearing. When the condition is no longer present, the message and any control activity tied to the status event reverts to normal.

Press “SILENCE” to silence the audible alarm. Check the active events to determine the status of the UPS. If “Auto Restart Fail” is the only alarm present, attempt a manual start of the unit by pressing “Startup,” “Manual Start,” then following the prompts to attempt to place the unit back online. If the manual start fails, or if there are other alarms present that won’t clear, contact your factoryauthorized service provider.

Press “SILENCE” to silence the audible alarm. Press “RESET” to attempt to clear active events. This does not clear the “Auto Retransfer Failed” alarm. If all other alarm conditions are clear, for a single module system attempt a manual transfer to Inverter by pressing “Transfer,” “UPS.” For a multimodule system attempt to manually reconnect this inverter by pressing “Transfer,” “Connect This Inverter.” If successful, press “RESET” to clear this alarm from the Active Event Window. If the UPS fails connect the inverter to the critical bus and the active messages do not explain the reason, contact your factory-authorized service provider.

Check the Battery Monitor Module for more details on this condition. Contact your factory-authorized service representative for service.

Press “SILENCE” to silence the audible alarm. Check the status of Battery Circuit Breaker 1. If it is open, the alarm is normal. If Battery Circuit Breaker 1 is closed, contact your factory-authorized service provider.

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Table 10 Liebert NXL alarm and status messages (continued)

Event Message Event Definition Recommended Action

Press “SILENCE” to silence the audible alarm. Observe the One-Line Display. If the input line is orange, black, or gray, the battery discharging condition is normal. If the input line on the One-Line Display is green, check the Active Event Window for potential fault conditions that could explain why the UPS is on battery. An example of this could be “Rectifier Fault.” Monitor the UPS during the battery discharge. The display shows the discharge curve of the battery. When the Battery Voltage Line touches the End of Discharge Line, the UPS shuts down. Check the bypass line on the One-Line Display. If the line feeding the Static Bypass Switch (BPSS) is green, the unit can be transferred to bypass by pressing “Transfer,” “Bypass” to transfer the load to the bypass source. Note that transferring to bypass could expose the load to an outage if the bypass source fails. If the battery is discharging because of a fault such as “Rectifier Fault” in the Active Event Window rather than an actual power outage, transfer to bypass if available, and contact your factoryauthorized service provider.

In normal operation, no user response is required. Equalize charge can be terminated at any time by pressing “Battery Management,” “Manual Battery Equalize,” “Stop.”

Press “SILENCE” to silence the audible alarm. Are any Battery Circuit Breakers tripped? Perform a visual inspection of the batteries in the tripped string(s). Look for signs of leaking battery acid or excessively corroded battery terminals. If there are no visible signs of defective batteries, press “RESET” to try and clear the alarm. Close any open breakers one at a time, pressing “RESET” after each one to see which string is causing the alarm. The string reporting the fault, when online, will not allow the alarm to reset. Once the location is identified, or if the battery string tests are inconclusive, contact your factoryauthorized service provider.

Press “SILENCE” to silence the audible alarm. Wait 30 minutes and check to see if the alarm has cleared. If the alarm does not clear 15 minutes after the battery test, but does clear within 30 minutes after the battery test, check the condition of the batteries (contact your factory-authorized service provider). If the alarm is still present 30 minutes after the battery test concluded, check the Event Log by pressing “Status Reports,” “Event Log” for additional information and contact your factoryauthorized service provider.

Batt Discharging

Batt Equalizing

Batt Ground Fault

Batt Not Charging

The UPS is on Battery. The most common reason for going to battery is a loss of Rectifier input power (power outage). This alarm is self-clearing. When the condition is no longer present, the alarm and any control activity tied to the alarm reverts to normal.

The Batteries are being equalized. Battery equalization stops automatically based on the Equalize Time Setting. This status message is self-clearing. When the condition is no longer present, the message and any control activity tied to the status event reverts to normal.

Detected Battery ground current exceeds the trip setting. A possible symptom that could cause this alarm is a leaking battery. This alarm has a higher detection setpoint than “Battery Ground Fault Current Warning,” and if present, means that the Battery Ground Fault Current is excessive. This alarm could cause Battery Breakers to trip if the “Battery Ground Fault Trip Enable” setting is enabled.

The UPS just passed a Manual or Automatic Battery Test and the float voltage has not yet returned to normal. This alarm is self-clearing. When the condition is no longer present, the alarm and any control activity tied to the alarm reverts to normal.

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UPS Alarm and Status Messages

Table 10 Liebert NXL alarm and status messages (continued)

Event Message Event Definition Recommended Action

Press “SILENCE” to silence the audible alarm. Observe the One-Line Display. To identify which battery cabinet is reporting the temperature condition, press the “Battery Box” on the One-Line Display to cycle through each battery compartment or string. The temperature display is located under the voltage reading in the Battery Box. If the Common Battery Disconnect and/or the individual battery cabinet or string reporting the over temperature condition is tripped, check the following settings. Press “User Settings,” “Battery Management,” “Battery Temperature” to check the current Battery Temperature Setpoints. If none of the Battery Boxes on the One-Line Display exhibit a temperature in excess of the temperature setpoint in the user settings, contact your factoryauthorized service provider. If the over temperature limit is being reported correctly, investigate potential causes such as faulty air conditioning, or air flow blockage and resolve. Otherwise, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Observe the One-Line Display. To identify which battery cabinet is reporting the temperature condition, press the “Battery Box” on the One-Line Display to cycle through each battery compartment or string. The temperature display is located under the voltage reading in the Battery Box. Press “User Settings,” “Battery Management,” “Battery Temperature” to check the current Battery Temperature Setpoints. If none of the Battery Boxes on the One-Line Display exhibit a temperature in excess of the temperature setpoint in the user settings, contact your factoryauthorized service provider. If the over temperature warning is being reported correctly, investigate potential causes, such as faulty air conditioning or air flow blockage and resolve. Otherwise, contact your factory-authorized service provider.

During normal operation, no user response is required. The battery test can be terminated at any time by the user by pressing “Batt Mgt,” “Manual Battery Test,” “Stop.”

Press “SILENCE” to silence the audible alarm. Try to identify which sensor has failed by observing the temperature reading inside the Battery Box on the One-Line Display. Cycle through all connected batteries by pressing the Battery Box on the display. Contact your factory-authorized service provider.

Batt Ovtemp Limit

Batt Ovtemp Warning

Batt Self Test

Batt Sensor Fail

One or more of the Battery Temperature Sensors is reporting a temperature above the limit setpoint. There are two user adjustable Battery Temperature Setpoints: Battery Over Temperature Warning and Battery Overtemperature Limit. The temperature in one or more battery compartments has risen above the limit setpoint. Depending on user settings, the controls may trip the battery breaker associated with the over temperature condition.

One or more of the Battery Temperature Sensors is reporting a temperature above the warning setpoint. There are two user adjustable Battery Temperature Setpoints: Battery Over Temperature Warning and Battery Overtemperature Limit. This alarm means the temperature in one or more battery compartments has risen above the warning setpoint. This alarm is self-clearing. When the condition is no longer present, the alarm and any control activity tied to the alarm reverts to normal.

The UPS is performing a battery self test. The battery self test terminates automatically at the end of the test. Battery test settings are adjustable and can be accessed by pressing “Config,” “User Settings,” “Batt Mgt,” “Battery Test.” This status message is self-clearing. When the condition is no longer present, the message and any control activity tied to the status event reverts to normal.

The controls are sensing a failed Battery Temperature Sensor. If a sensor reports a value outside the normal operating range of the sensor, it is considered failed. This alarm is self-clearing. When the condition is no longer present, the alarm and any control activity tied to the alarm reverts to normal.

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UPS Alarm and Status Messages

Table 10 Liebert NXL alarm and status messages (continued)

Event Message Event Definition Recommended Action

Press “SILENCE” to silence the audible alarm. To attempt to identify which sensor is reporting an inconsistent temperature or an overheating battery, observe the temperature reading inside

With more than one Battery Temperature Sensor Batt Temp Imbalance

installed, the controls are detecting too great a

temperature difference between the individual

sensors.

An Automatic or Manual Battery Test Failed. The

battery “Test Duration” is adjustable. The battery

test fail criteria were met before the end of the Batt Test Failed

timed battery test.

For example, there must be at least 25% load to

run the battery test. If, during the battery test the

load drops below 25%, the test fails.

The conditions required to perform an automatic

battery test are not met.

When the battery test is inhibited, the system

delays the test for 7 days. If conditions are Batt Test Inhibit

satisfied after 7 days, the UPS performs the

battery test at that time.

Examples of conditions required to run the

automatic battery test are at least 25% load, all

battery breakers closed, normal operation, etc.

Batt Test Passed The Battery Test passed.

The Backfeed Breaker is open.

The Backfeed Breaker feeds the Static Bypass

Switch (BPSS). The physical location of the

breaker depends on unit configuration. It may be

located in the UPS, or it may be located external

to the UPS. BFB Open

The purpose of the Backfeed Breaker is to

prevent leakage current through the bypass

circuit during an outage.

This status message is self-clearing. When the

condition is no longer present, the message and

any control activity tied to the status event

reverts to normal.

BPSS is On The Bypass Static Switch is On.

The Bypass Static Switch (BPSS) was turned Off

due to an extended overload.

While the BPSS can sustain an overload greater

than the Inverter and for a longer period of time, BPSS Ovld Exceeded

there are still limits on the amplitude and duration

of overload that the BPSS can handle. This

alarm indicates the overload was greater in

amplitude and time than the BPSS can handle,

and therefore shut Off to prevent damage to the

equipment.

the Battery Box on the One-Line Display. Cycle through all connected batteries by pressing the Battery Box. If it appears this alarm is due to a specific cabinet or battery string being warmer than the others, verify through investigation whether the string is actually getting warmer than the others, or if the sensor appears to be reporting incorrectly. Contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Contact your factory-authorized service provider.

Check the Active Event Window and investigate other events to further analyze. If there are other active events in the Active Event Window, press “RESET” to clear the events. Check the One-Line display to verify the UPS is online. Check the Module Output Meter and verify the kW load is between 25%-100%. Press the Battery Box on the One-Line Display and verify all battery strings show at least 96% charged and all battery breakers are closed. If the issue cannot be resolved, contact your factory-authorized service provider.

This status message is informational. If the breaker was not opened intentionally, or if the breaker is actually closed and this message is active, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Once the overload source is isolated, restart the UPS by pressing “Startup,” “Manual Start” and follow the prompts. If the overload condition does not clear, or the overload is cleared but the UPS does not restart, contact your factory-authorized service provider.

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UPS Alarm and Status Messages

Table 10 Liebert NXL alarm and status messages (continued)

Event Message Event Definition Recommended Action

When starting the module BPSS's in a 1+N

BPSS Start Inhibit

BPSS Unable

Breaker Close Fail

Breaker Open Fail

Byp Overload Ph A

Byp Overload Ph B

system without a MBB, there are not enough

module BPSS's ready with their MOB closed to

support the rated capacity.

This alarm is a latching alarm that must be

cleared at each module after enough Bypass

Static Switches are available to support the

system load.

A problem has been detected in the Bypass

Static Switch.

This is a summary event that informs the user

that a circuit breaker that was either signaled to

close or was manually closed failed to report a

closed status.

The Breaker Close Fail event indicates a

mismatch between the expected state of a

breaker and the reported state of the breaker.

This is a summary event that informs the user a

circuit breaker that was either signaled to open

or was manually opened failed to report an open

status.

The Breaker Open Fail event indicates a

mismatch between the expected state of a

breaker and the reported state of the breaker.

The critical load is greater than 110% while the

UPS is on bypass. The controls may shut the

unit down if the overload condition does not clear

within the allotted time. Allotted time is variable,

and is inversely proportional to the amplitude of

the overload, i.e., the greater the amplitude of

the overload, the less time the unit continues to

support the load.

This alarm is self-clearing. When the condition is

no longer present, the alarm and any control

activity tied to the alarm reverts to normal.

The critical load is greater than 110% while the

UPS is on bypass. The controls may shut the

unit down if the overload condition does not clear

within the allotted time. Allotted time is variable,

and is inversely proportional to the amplitude of

the overload, i.e., the greater the amplitude of

the overload, the less time the unit continues to

support the load.

This alarm is self-clearing. When the condition is

no longer present, the alarm and any control

activity tied to the alarm reverts to normal.

Press “SILENCE” to silence the audible alarm. Contact your factory-authorized service provider if there are enough Bypass Static Switches available to support the existing system load.

Press “SILENCE” to silence the audible alarm. Press “RESET” to attempt to clear the fault. Contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Check the One-Line Display and the Active Event Window to determine which breaker or switch is open. If the open breaker cannot be reset or closed, or if all breakers are closed but the One-Line Display does not agree, or the alarm cannot be cleared, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Check the One-Line Display and the Active Event Window to determine which breaker or switch that should be open is still closed. If a breaker that should be open shows closed, or if the breaker in question actually is open but the fault is still present, attempt to clear the fault by pressing “RESET.” If the event does not reset, contact your factoryauthorized service provider.

Press “SILENCE” to silence the audible alarm. Observe the calculated load percentage on A phase displayed on the Module Output Meter. If the A phase steady state load percentage exceeds 110%, perform the following: If Maintenance Bypass is available, follow Standard Operating Procedures to transfer the load to Maintenance Bypass. Investigate the overload condition. If the Module Output Meter does not indicate an overload condition, perform the previous steps and contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Observe the calculated load percentage on B phase displayed on the Module Output Meter. If the B phase steady state load percentage exceeds 110%, perform the following: If Maintenance Bypass is available, follow Standard Operating Procedures to transfer the load to Maintenance Bypass. Investigate the overload condition. If the Module Output Meter does not indicate an overload condition, perform the previous steps and contact your factory-authorized service provider.

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Table 10 Liebert NXL alarm and status messages (continued)

Event Message Event Definition Recommended Action

Press “SILENCE” to silence the audible alarm. Observe the calculated load percentage on C phase displayed on the Module Output Meter. If the C phase steady state load percentage exceeds 110%, perform the following: If Maintenance Bypass is available, follow Standard Operating Procedures to transfer the load to Maintenance Bypass. Investigate the overload condition. If the Module Output Meter does not indicate an overload condition, perform the previous steps and contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Observe the One-Line Display. The bypass power line feeding the static switch is green when bypass power is within normal operating range. If the line feeding the static switch is orange, gray, or black, bypass voltage is out of tolerance. Also check the bypass voltage readings on the Bypass Meter. When the bypass returns to normal, this alarm clears automatically. If all indications checked above are normal and the alarm is still present, contact your factory-authorized service provider. If there is a problem indicated with the bypass voltage, investigate and resolve the issue. Examples of conditions which could cause this alarm: Unstable generator voltage; or, Bypass Feeder Breaker tripped.

Press “SILENCE” to silence the audible alarm. Check the frequency on the Bypass Meter. If the frequency is outside the synchronization range, investigate and resolve the issue. This alarm is commonly the result of an uncalibrated generator, or power anomalies on the utility feed. Check bypass power for nominal limits. If bypass frequency appears normal, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Press “RESET” to attempt to reset the fault. Contact your factory-authorized service provider

If the alarm does not clear, or if the alarm condition returns, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm.

Byp Overload Ph C

Bypass Breaker (SBB) Open

Bypass Not Avail

Bypass OF/UF

Controller Error

Controls Comm Fail

Controls Reset Required

The critical load is greater than 110% while the

UPS is on bypass. The controls may shut the

unit down if the overload condition does not clear

within the allotted time. Allotted time is variable,

and is inversely proportional to the amplitude of

the overload, i.e., the greater the amplitude of

the overload, the less time the unit continues to

support the load.

This alarm is self-clearing. When the condition is

no longer present, the alarm and any control

activity tied to the alarm reverts to normal.

The bypass circuit breaker indicates that it is in

the open position.

This summary event indicates a problem with the

detected bypass voltage. If bypass is not

available, transfers to bypass are disabled.

This alarm is self-clearing. When the condition is

no longer present, the alarm and any control

activity tied to the alarm reverts to normal.

The bypass frequency has exceeded the bypass

frequency limit of ± 5 Hz of nominal. If this alarm

is active, transfers to bypass are disabled.

This alarm is self-clearing. When the condition is

no longer present, the alarm and any control

activity tied to the alarm reverts to normal.

This is a summary event that indicates a DSP

communication error.

The Controller Error event is a fault condition that

indicates a loss of communications in the

controls.

The Controls Communication Failure event

indicates a loss of communications between the

Controls and Human Machine Interface (HMI).

The Controls Communication Failure event is

displayed when the HMI detects a loss of

communication with Controls on the Controller

Area Network (CAN).

An infrequent occurrence that resets

immediately is probably not serious.

This alarm means one or more critical settings

have been changed by user during UPS

operation.

The change(s) will not take effect until after a

UPS Controls reset. This operation should only

be performed by an authorized service

personnel.

This alarm is cleared after UPS Controls reset.

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Table 10 Liebert NXL alarm and status messages (continued)

Event Message Event Definition Recommended Action

Press “SILENCE” to silence the audible alarm. Press “RESET” to clear the fault. Perform a visual inspection of the batteries. Look for signs of leaking battery acid or excessively corroded battery terminals. If there are no visible signs of defective batteries, open one Battery Breaker. Press “RESET” and see if the condition clears. If the condition clears, you have isolated the problem to that battery string. If the condition will not clear, repeat the test with each connected battery string. Once the location is identified, or if the battery string tests are inconclusive, contact your factoryauthorized service provider.

Under normal circumstances, none.

Perform ECO Mode setup and operation by pressing “CONFIG,” “User Settings,” “ECO Mode” from the Menu Bar. ECO Mode can be manually controlled under the “Operation” submenu, or configured to run automatically under the “Schedule” submenu.

If this message is active, and there is no clear reason why the UPS is in ECO Mode, contact your factory-authorized service provider.

Under normal circumstances, none.

DC Link Gnd Fault-

DC Link Gnd Fault+

ECO Mode Active

The negative DC Bus has a ground fault.

The UPS controls monitor the DC Bus negative

half for a voltage imbalance caused by current

flow to ground. This fault means excessive

ground current is detected.

In normal operation, with the batteries

connected, the most likely cause of a current

path to ground is a leaking battery.

If your system includes an optional Battery

Ground Fault Monitor, check if the Battery

Ground Fault message is present also.

The positive DC Bus has a ground fault.

The UPS controls monitor the DC Bus positive

half for a voltage imbalance caused by current

flow to ground. This fault means excessive

ground current is detected.

In normal operation, with the batteries

connected, the most likely cause of a current

path to ground is a leaking battery.

If your system includes an optional Battery

Ground Fault Monitor, check if the Battery

Ground Fault message is present also.

This event indicates that ECO Mode operation is

active.

The ECO Mode feature improves the overall

efficiency of the UPS system by powering the

critical bus from the bypass static switch instead

of the inverter. If the critical bus goes out of

tolerance (voltage, frequency or slew rate), the

BPSS is turned Off and the inverter quickly

assumes powering the critical bus. The inverter

is always ready to take the load in the event that

the bypass source fails.

The user has the ability to start and stop ECO

Mode manually via the user interface or

automatically based on a user-defined schedule.

ECO Mode Suspended

This event indicates that ECO Mode operation is

suspended.

When the ECO Mode feature is enabled and

active, the UPS system powers the critical bus

from the bypass static switch instead of the

inverter. But if the critical bus goes out of

tolerance (voltage, frequency or slew rate), ECO

mode is temporarily suspended (or “inhibited.”)

The BPSS is turned Off and the inverter quickly

assumes powering the critical bus.

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Typically ECO Mode operation will resume soon after the bypass source becomes qualified again, unless the ECO Mode session is terminated due to a manual or scheduled 'Stop' command or if excessive ECO Mode suspensions occur.

Perform ECO Mode setup and operation by pressing “CONFIG,” “User Settings,” “ECO Mode” from the Menu Bar. ECO Mode can be configured via the “Settings” submenu and manually controlled under the “Operation” submenu.

If this message is active, and there is no clear reason why ECO Mode is inhibited, contact your factory-authorized service provider.

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Table 10 Liebert NXL alarm and status messages (continued)

Event Message Event Definition Recommended Action

Press “SILENCE” to silence the audible alarm. Resolve the issue that precipitated the EMO. For safety, the UPS latches an EPO event. To clear the latch, press the EMO Reset push button on the External Interface Board (EIB). Verify the EMO is cleared by pressing “RESET” and observing that the EPO alarm in the Active Event Window is gone. Restart the UPS by pressing “Startup,” “Manual Start,” and follow the prompts.

Press “SILENCE” to silence the audible alarm. Resolve the issue that precipitated the EPO. For safety, the UPS latches an EPO event. There are two ways to clear the latch:

1. Press the EPO Reset push button on the External Interface Board (EIB).

2. From HMI front panel display, press OK button when “Press OK to Reset EPO Latched signal” message is displayed in a dialog box. Verify the EPO is cleared by observing the EPO alarm in the Active Event Window is gone. Restart the UPS by pressing “Startup,” “Manual Start,” and follow the prompts.

Investigate possible causes for a rising temperature condition, such as loss of air conditioning, airflow obstructions, etc. If the ambient temperature is high due to loss of air conditioning and cannot be addressed immediately, perform the following: Press “Transfer,” “Bypass” to transfer the UPS to bypass. Press “SILENCE” to silence the audible alarm. Wait at least 15 minutes, then attempt to reset the alarm by pressing “RESET.” If the alarm clears and proper cooling has been restored to the UPS, press “Transfer,” “UPS” to transfer back to UPS. If this alarm is present and no external factors are affecting proper cooling of the UPS, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Check the One-Line Display for system status: UPS Off If external Maintenance Bypass is available, close the Maintenance Bypass Breaker (MBB) to restore power to the load. Do not attempt to restart the UPS without first contacting your factoryauthorized service provider. UPS On

Bypass Verify the bypass line is green. If it is not, contact your factory-authorized service provider immediately and prepare to shut down the load. If external Maintenance Bypass is available, close the Maintenance Bypass Breaker (MBB) to place the load on Maintenance Bypass. Do not attempt to re-transfer to UPS without first contacting your factory-authorized service provider. U

PS On Battery Verify the bypass line is green. If it is not, contact your factory-authorized service provider immediately and prepare to shut down the load. If the bypass line is green, press “Transfer”, “Bypass,” to transfer the load to bypass.

EMO Shutdown

EPO Shutdown

Equip Ovtemp

Equip Ovtemp Limit

An Emergency Module Off (EMO) command has been detected. The EMO signal means the front panel EMO button was pressed. A Remote EMO would display the “REMO Shutdown” alarm. In response to an EMO, the UPS transfers to Bypass and shuts Off.

The UPS shuts down in response to an active Emergency Power Off (EPO) command.

This summary event indicates the UPS is nearing an over temperature condition. Depending on which sensor is reporting the high temperature, the UPS may do one of three things once the limit is reached: shut down, transfer to bypass, or transfer to battery operation. This is a potentially serious event.

This summary event occurs when one or more internal temperatures have exceeded the maximum temperature setpoint. This is the second of two over temperature alarms. The first, “Equipment Overtemperature Warning,” sets when the detected temperature is near the limit. The controls react to this condition in various ways, depending on which sensor is reporting the over temperature condition.

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Table 10 Liebert NXL alarm and status messages (continued)

Event Message Event Definition Recommended Action

The UPS has tried to reconnect the inverter to the critical bus too many times. For a single module system, the load will be on the bypass static switch. For multi-module systems the load will be supported by the other modules. The UPS will attempt to automatically recover and reconnect the Inverter to the critical bus, if

Excess Auto Rexfers

the reason that caused it to disconnect has cleared and the event is recoverable; for example, a temporary overload. The number of times the UPS attempts to recover is limited. When the number of attempts exceed the allowable number (default is 5 attempts per hour), the inverter will remain disconnected from the critical bus and this event will be displayed. An example of a condition that could cause this alarm is a cycling load on the UPS where the peak load exceeds the overload capability. If the cycling load exceeds the overload capability for more than the allowable number, the UPS will have to be put online manually by selecting “Transfer,” “UPS.”

This event indicates that ECO Mode operation has been terminated due to an excessive number of suspensions.

Press “SILENCE” to silence the audible alarm. Press “RESET” to clear any active faults or alarms. Provided there are no alarms or faults still present that could prevent a transfer, press “Transfer,” “UPS,” to reconnect the Inverter to the critical bus. If successful, press “RESET” to clear the alarm. Otherwise, contact your factory-authorized service provider.

This event will clear the next time ECO Mode is initiated by a manual or scheduled 'start' command.

Excess ECO Suspends

Excess Paralleling

Fuse Fail

When the ECO Mode feature is enabled and active, the UPS system powers the critical bus from the bypass static switch instead of the inverter. But if the critical bus goes out of tolerance (voltage, frequency or slew rate), ECO mode is temporarily inhibited (or “suspended.”) This event is generated when ECO mode is repeatedly suspended and exceeds the user setting for the maximum number of automatic suspensions allowed.

When the controls detect a high amplitude, short duration overload condition on the output, the static switch is turned on momentarily in parallel with the Inverter to attempt to clear the condition. If the fault clears, the controls turn Off the static switch and the load remains on Inverter. This fault condition indicates the UPS pulse paralleled too many times and is now locked on bypass (auto re-transfers to Inverter are inhibited).

This is a summary event that indicates a fuse has opened. There are several fuses that can cause this fault. The Fuse Failure event is caused by one or more fuses reporting a failed status. The UPS may or may not transfer to bypass as a result of the failed fuse.

If this message is active, and there is no clear reason why excessive ECO Mode suspensions are occurring, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Check the Module Output Meter and verify the output currents are normal, the kVA/kW percentages are less than 100%, and the Rexfer Time out is 00:00. Verify the Inverter box on the One-Line Display is green. Investigate any other active alarms or faults before attempting to clear this fault. Press “RESET” to clear the fault. If the Event Window is clear, press “Transfer,” “UPS” to transfer the load back to Inverter. If the “UPS” button is grayed out, or pressing the “UPS” button does not transfer the unit back to Inverter, or if the UPS immediately transfers back to bypass, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Check the One-Line Display and other indicators to determine the state of the unit and take appropriate action. Contact your factory-authorized service provider.

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Event Message Event Definition Recommended Action

Press “SILENCE” to silence the audible alarm. Check the Inlet Air Temperature on the One-Line Display and verify the reading is accurate, i.e. is the room temperature warmer than normal? If the room temperature is warmer than normal, investigate and resolve the issue. If the room temperature is normal, and the Inlet Air Temp reading on the One-Line Display is higher than normal, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Verify correct phase rotation at the input. If the phase rotation is correct, contact your factory-authorized service provider.

Check the wires landed on Input Contact Isolator #X. If this signal is not active, or if no signal wires are present, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Press “RESET” to attempt to clear the alarm condition. If the alarm clears, press “Startup,” “Device Control,” “Close Trap” to manually close the filter contactor. If the contactor remains closed, check the Input Meter and verify the input currents are balanced. If the contactor re-opens and the “Input Current Imbalance” returns, silence the alarm, leave the filter contactor open, and contact your factoryauthorized service provider.

Inlet Ovtemp

Inp Phase Rotation

Input Breaker (BIB) Open

Input Breaker (RIB) Open

Input Contact “XY”

Input Current Imbal

The air flowing into the UPS is too warm. This alarm is self-clearing. When the condition is no longer present, the alarm and any control activity tied to the alarm reverts to normal.

The correct input phase rotation should be clockwise, or A-B-C. This alarm indicates the sensed input phase rotation is counterclockwise. If this alarm occurs on an operational unit, it typically indicates upstream work was performed (input side) and the input wiring was connected incorrectly. This alarm is self-clearing. When the condition is no longer present, the alarm and any control activity tied to the alarm reverts to normal.

The bypass isolation breaker indicates that it is in the open position.

The rectifier isolation breaker indicates that it is in the open position.

The displayed text for this alarm depends on settings. In response to this alarm, the user may see any of four possible messages: No message at all, but the help icon is present; A custom message programmed by the user; “Input Contact XY” if the contact is unconfigured; “Stop Batt Charge” if the contact is programmed as Pre-assigned. If this event is active, an external signal is wired into channel Y of Input Contact Isolator #X. If the display shows Case 1 above (blank message), it means the contact channel is set to default but the default message was erased. If the display shows Case 2, the userprogrammed event is active and the displayed text is customer defined. If the display shows Case 3, the contact is active but was not pre-programmed (default condition). If the display shows Case 4, the controls disable Battery charging operation. This alarm message is self-clearing. When the condition is no longer present, the message and any control activity tied to the alarm will revert to normal.

The detected input currents are not balanced. This latching alarm indicates a potential problem in the input filter. The controls automatically open the filter contactor in response to this condition. The filter contactor must be manually closed once it opens in response to this alarm.

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Table 10 Liebert NXL alarm and status messages (continued)

Event Message Event Definition Recommended Action

An active Input Current Limit alarm means the

Press “SILENCE” to silence the audible alarm. Observe the meters on the One-Line Display for input voltage level, battery charge/discharge current, and output load percentage kW. Investigate any abnormal readings. If the reason for the alarm cannot be determined, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Attempt to manually close the disconnect by pressing “Startup,” “Device Control,” “Close Trap.” If the condition which caused the filter disconnect to lock open is still present, it re-opens. If the disconnect cannot be manually closed or the alarm cannot be cleared, contact your factoryauthorized service provider.

Press “SILENCE” to silence the audible alarm. Examine the One-Line Display. The Rectifier input line feeding the Input Breaker should be green. If not, investigate source power to the UPS. If input power is good, and this alarm is active, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Press “RESET” to clear the alarm. If the alarm cannot be reset, or if the alarm condition returns, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Check the Module Output Meter and note the A phase load percentage. If possible, reduce A phase loading. If the steady state load remains above 105%, allow the UPS to transfer to bypass and contact your factory-authorized service provider. If the displayed load percentage is less than 100% and the alarm is still active, contact your factoryauthorized service provider.

Input Current Limit

Input Filter Cycle

Input Not Avail

Internal Comm Error

Inv Overload Ph A

detected input current (RMS) exceeds the limit setpoint (default is 125%). This may be normal depending on various operating conditions, such as input voltage level, output load level, and whether the batteries have recently discharged. This alarm is self-clearing. When the condition is no longer present, the alarm and any control activity tied to the alarm reverts to normal.

The Input Filter Disconnect is locked open. The Input Filter Disconnect Cycle counter has exceeded the setpoint. The Input Filter Disconnect opens automatically as determined by the disconnect settings, or because of an unusual condition. An example of a setting would be to automatically open the filter disconnect under light load conditions to improve the input power factor. An example of an unusual condition would be unbalanced currents on the input, possibly because of a suspect component in the filter itself.

This summary alarm means there is a problem with input power. It is not acceptable to the Rectifier. If the unit is running normally when this event occurs, the UPS goes to battery. This alarm is self-clearing. When the condition is no longer present, the alarm and any control activity tied to the alarm reverts to normal

This is a summary event caused by an interruption in communication between the controls and a device on the Controller Area Network (CAN). The Internal Communication Error event indicates a loss of communications between the controls and an external device. The Internal Communication Error is displayed when the controls detect a loss of communication to a device on the Controller Area Network (CAN). An infrequent occurrence that resets immediately is probably not serious.

An overload condition is active on A phase. A phase load condition exceeds 105%. A countdown timer is displayed on the One-Line Display in response to this alarm, and indicates the time remaining until a transfer to bypass occurs. The length of time remaining until transfer is directly proportional to the severity of the overload. This alarm is self-clearing. When the condition is no longer present, the alarm and any control activity tied to the alarm reverts to normal.

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Table 10 Liebert NXL alarm and status messages (continued)

Event Message Event Definition Recommended Action

Inv Overload Ph B

Inv Overload Ph C

Inv Ovld Exceeded

Inverter Fault

Inverter Output Breaker (CB2) Open

An overload condition is active on B phase. B phase load condition exceeds 105%. A countdown timer is displayed on the One-Line Display in response to this alarm, and indicates the time remaining until a transfer to bypass occurs. The length of time remaining until transfer is directly proportional to the severity of the overload. This alarm is self-clearing. When the condition is no longer present, the alarm and any control activity tied to the alarm reverts to normal.

An overload condition is active on C phase. C phase load condition exceeds 105%. A countdown timer is displayed on the One-Line Display in response to this alarm, and indicates the time remaining until a transfer to bypass occurs. The length of time remaining until transfer is inversely proportional to the severity of the overload. This alarm is self-clearing. When the condition is no longer present, the alarm and any control activity tied to the alarm reverts to normal.

This message is displayed in response to an overload on one or more output phases. When an overload occurs, the controls display a countdown timer that displays the time remaining until a transfer to bypass occurs. The length of the timer is inversely proportional to the amplitude of the overload. When the timer reaches zero, the UPS transfers to bypass and populates the Active Event Window with this alarm. This fault is non-latching. When the underlying condition is no longer present, this fault and any control activity tied directly to this fault reverts to normal.

This summary event indicates a potentially serious problem in the Inverter. The controls react to an Inverter fault in different ways depending on the root event that caused the fault. If bypass is available, the controls transfer to static bypass. A restart may or may not be possible.

The inverter output breaker indicates that it is in the open position.

Press “SILENCE” to silence the audible alarm. Check the Module Output Meter and note the B phase load percentage. If possible, reduce B phase loading. If the steady state load remains above 105%, allow the UPS to transfer to bypass and contact your factory-authorized service provider. If the displayed load percentage is less than 100% and the alarm is still active, contact your factoryauthorized service provider.

Press “SILENCE” to silence the audible alarm. Check the Module Output Meter and note the C phase load percentage. If possible, reduce C phase loading. If the steady state load remains above 105%, allow the UPS to transfer to bypass and contact your factory-authorized service provider. If the displayed load percentage is less than 100% and the alarm is still active, contact your factoryauthorized service provider.

Press “SILENCE” to silence the audible alarm. Observe the load percentages for each phase on the Module Output Meter. If the load is less than 100%, attempt to transfer back to Inverter by pressing “Transfer,” “UPS.” If the transfer is successful, investigate the reason for the overload and take appropriate action. If the transfer is unsuccessful, contact your factoryauthorized service provider.

Press “SILENCE” to silence the audible alarm. Check the One-Line Display to determine the state of the UPS. If both the Rectifier and Inverter are shut Off, press “RESET” to attempt to clear any latched alarms or faults. Attempt a restart by pressing “Startup,” “Manual Start,” and follow the prompts to place the UPS back in service. If the startup fails, contact your factory-authorized service provider. If the Rectifier and Inverter appear to be running, press “RESET” to attempt to clear any latched alarms or faults, then attempt a transfer by pressing “Transfer,” “UPS.” If the transfer is successful, contact your factory-authorized service provider. If the transfer is unsuccessful, contact your factoryauthorized service provider.

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Table 10 Liebert NXL alarm and status messages (continued)

Event Message Event Definition Recommended Action

This UPS system has been enabled as the functional Master Load Bus Synchronization (LBS) system. The functional Master is sending the LBS sync

LBS Active Master

pulse. This status message is self-clearing when the LBS is disabled or this system is no longer selected as the LBS Master. When the condition is no longer present, the message and any control activity tied to the status event reverts to normal.

With LBS operation enabled, conditions required to allow LBS operation are not met.

Voltage or Frequency differences sensed by the LBS Inhibited

LBS control are preventing the ability of LBS to

function correctly.

This alarm is self-clearing. When the condition is

no longer present, the alarm and any control

activity tied to the alarm reverts to normal.

With a load of 80% or greater, the controls have

calculated the output Power Factor to be less

than 0.95 leading.

Leading Pwr Factor

Leading Power Factors result in wasted energy.

If the Power Factor is less than 0.95 leading, the

UPS output is de-rated to compensate for output

losses.

This alarm is self-clearing. When the condition is

no longer present, the alarm and any control

activity tied to the alarm reverts to normal.

Load Bank Breaker (LBB) Open

Load on Bypass

Load on Maint Byp

The load bank breaker indicates that it is in the

open position.

The load is being supplied by bypass.

The load is on Maintenance Bypass

Load on UPS The load is being supplied by the Inverter

The multi-module system has less than one

redundant module online. The number of

redundant modules is calculated by taking the

number of modules online minus the numbers of

modules of load, rounded down to the nearest

whole number (i.e., 3 Modules Online - 1.75

Loss of Redundancy

Modules of Load = 1 redundant modules online).

This is a “notification only” type alarm, meaning

the UPS takes no action other than sounding an

audible alarm based on this setpoint.

The alarm is self-clearing.

The alarm condition can be permanently

terminated by selecting NO in the Paralleling

Modules selection of the Service Settings

located in the configuration screen.

A module in a multi-module system has detected

a loss of the sync pulse. Loss of Sync Pulse

The system shall change sync master in an

attempt to correct the loss of sync pulse.

If operating normally, the SCC always posts this

event.

Under normal circumstances, none. If this message is active, and there is no clear reason why the LBS circuit should be active, contact your factory-authorized service provider

Press “SILENCE” to silence the audible alarm. Check both Systems and verify normal operation: Both Systems running online on inverter; Neither System in Maintenance Bypass; No Bypass, Input, or Synchronization errors present on either system. If the cause of the alarm cannot be determined by checking both Systems, contact your factory-authorized service provider.

Press “SILENCE” to silence the audible alarm. Check the Output Meter readings and verify the Output Power Factor. If the displayed power factor is less than 0.95 leading, and the load is greater than 80%, reduce the load or investigate. Contact your factory-authorized service representative.

Press “SILENCE” to silence the audible alarm. Check the system load and verify that the system is non-redundant. To enable/disable the setting for the Loss of Redundancy you must select YES/NO (Enable/ Disable) in the Parallelling Modules selection located in the User Settings of the Configuration

screen. Press “Config,.”........... “User Settings,”

“Paralleling Modules.”

Press “SILENCE” to silence the audible alarm. Contact your factory-authorized service provider.

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Table 10 Liebert NXL alarm and status messages (continued)

Event Message Event Definition Recommended Action

One or more battery circuit breakers are open.

Low Batt Capacity

Low Batt Shutdown

Low Battery Warning

Low Power Factor

This alarm applies if the system includes more

than one battery circuit breaker, and at least one

is closed, but one or more are open.

This alarm is self-clearing. When the condition is

no longer present, the alarm and any control

activity tied to the alarm reverts to normal.

The Battery has reached End of Discharge

(EOD).

There is no longer enough energy left in the

battery to run the Inverter with the current load.

If bypass is available, the UPS attempts to

transfer the load to bypass at EOD.

The battery is nearly depleted, and the unit shuts

down very soon.

The Low Battery Warning setpoint is adjustable

under User Settings. This alarm means the

calculated time remaining on battery is now less

than the Low Battery Warning setpoint.

This alarm is self-clearing. When the condition is

no longer present, the alarm and any control

activity tied to the alarm reverts to normal.

The output power factor is low.

The output power factor is less than 70% leading

or lagging. A simplified explanation of power

factor is the ratio of energy being supplied to

energy being used by the load. For a given load,

the current output of the UPS goes up as power

factor decreases.

This results in the UPS output being derated.

For example, study the following:

Load = 100 kw @ 480V

amps = kW X 1000 / volts X power factor X 1.73

(square root of 3)

100kW X 1000 = 100000

480V X 0.9PF X 1.73 = 747.36

100000/747.36 = 133.8A

Now, replace the 0.9 power factor (typical

computer load power factor) with 0.7 power

factor:

100kW X 1000 = 100000

480V X 0.7PF X 1.73 = 581.28

100000/581.28 = 172A

The load remains the same, but the current

required to supply it is roughly 30% higher. The

extra current is wasted energy that can result in

nuisance trips of breakers, overheating of

cables, and other unwanted conditions. The UPS

cannot control the output power factor.

This alarm is notification to the user that the load

should be evaluated.

Press “SILENCE” to silence the audible alarm. To clear this alarm, verify all battery breakers are closed. Investigate any open breakers.

Press “SILENCE” to silence the audible alarm. Once power is restored, attempt a normal restart of the UPS. If the restart fails, contact your factory-authorized service provider.

Check to see if bypass is available by observing the One-Line Display. Acceptable bypass voltage is indicated by a green power line feeding the Static Bypass Switch (BPSS) box. If bypass is available, press “Transfer,” “Bypass” to transfer to bypass. If the bypass is qualified, the UPS transfers to the bypass source. If bypass is not available, prepare to shut down critical loads, or remove non-essential loads in order to extend battery run time so that critical loads may be shut down in an orderly manner.

Press “SILENCE” to silence the audible alarm. Evaluate the load on the UPS. For more information, contact your factory-authorized service provider

Liebert® NXL

™

Emerson Liebert NXL 750 kVA, Liebert NXL 400 kVA, Liebert NXL 625 kVA, Liebert NXL 1100 kVA, Liebert NXL 300 kVA Operation And Maintenance Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

BATTERY CABINET PRECAUTIONS

Contacting Emerson Network Power® for Support

SAVE THESE INSTRUCTIONS

Important Safety Instructions

1.0 INTRODUCTION

1.1 General Description

Figure 1 Typical single module UPS system one-line diagram

1.2 Modes of Operation

1.2.1 Normal Mode

1.2.2 Bypass Mode

1.2.3 Battery Mode

1.2.4 Maintenance Bypass

1.2.5 ECO Mode

1.2.6 Intelligent Paralleling

1.3 Options

2.0 OPERATION

2.1 Features

Figure 2 Main component locations—250 to 400kVA

Figure 3 Main component locations—500kVA

Figure 4 Main components, 625kVA Liebert NXL, N+1 multi-module unit without static bypass

Figure 5 Main components, 625kVA Liebert NXL UPS, SMS and 1+N multi-module unit with static bypass

Figure 6 Main component locations—750kVA with Static Bypass

Figure 7 Main component locations—750kVA without Static Bypass

Figure 8 Main components, 1+N multi-module or SMS with static bypass, 1100kVAw UPS

Figure 9 Main components, 1100kVA UPS N+1 multi-module without static bypass

Figure 10 Main Display Screen, typical

Figure 11 Mimic display

Figure 12 Monitor/mimic display example: Normal power flow

Figure 13 Monitor/mimic display example: Utility fail

Figure 14 Monitor/mimic display example: load on bypass, UPS On

Figure 15 Monitor/mimic display example: load on bypass, UPS module Off

2.2 Touchscreen Navigation

2.2.1 Main Display Screen

2.2.2 Configurations Menu

Rating

Figure 16 Rating Parameters

User Settings

Figure 17 System Settings parameters

Adjustable Setpoints

Figure 18 Adjustable setpoints parameters

Figure 19 Battery Equalize settings

Figure 20 Battery Management Parameters

2.3 Event Management

Figure 21 Typical Event Management Parameters

2.4 Status Reports Menu

2.5 Startup Menu

2.6 Shutdown Menu

Figure 22 UPS shutdown popup

Figure 23 System shutdown popup

2.7 Transfer Menu

2.8 Battery Management Menu

Figure 24 Time remaining display

Figure 25 Battery cycle monitor

Figure 26 Battery cycle monitor summary

2.9 System View—1+N Systems Only

Figure 27 Status View - 1+N systems only

Figure 28 1+N status view

2.10 Metering

2.11 Help

2.12 Reset

2.13 Silence

2.14 Modes of Operation

2.14.1 Load on Bypass

Figure 29 Load on bypass (UPS not available)

2.14.2 OK to Transfer

Figure 30 Load on bypass, UPS available

Figure 31 Load on UPS, bypass available

2.14.3 Input Power Failure—Load on DC Source

Figure 32 Input power fail, load on DC source

2.14.4 Off DC Source

Figure 33 Load on UPS, DC source not available

2.14.5 Emergency Module Off (Optional)

Figure 34 Emergency modules off

2.14.6 Remote Emergency Power Off

Figure 35 Remote emergency power off

2.14.7 ECO Mode