Emerson 40-200KVA User Manual

Liebert NX™ UPS

User Manual–40-200kVA, 480V, 60Hz

AC Power
For Business-Critical Continuity™

TABLE OF CONTENTS

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

GLOSSARY OF SYMBOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

2.0 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

2.1 External Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 Internal Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2.1 Storing for Delayed Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3 Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3.1 Identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4 UPS Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4.1 Positioning the UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4.2 Environmental Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4.3 Special Considerations for Parallel Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.5 Considerations in Moving the Liebert NX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.6 Mechanical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.6.1 Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.6.2 Floor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.6.3 Cable Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.6.4 Optional Cabinets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.0 ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

3.1 Power Cabling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.1.1 Cable Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.1.2 UPS Input Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.1.3 Cabling Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.1.4 Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.1.5 Safety Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.1.6 Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.1.7 Cabling Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.2 Control Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.2.1 Monitor Board Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.3 Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.3.1 Input Dry Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.3.2 Maintenance Bypass Cabinet Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.3.3 Battery Circuit Breaker Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.3.4 Output Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.3.5 EPO Input—Optional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4.0 BATTERY INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

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4.3 External Battery Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.3.1 Battery Cabinets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.3.2 Connecting the Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4.3.3 Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4.3.4 Connecting the Battery Cabinet to the UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.4 Non-Standard Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.5 BCB Shunt Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.6 Alber Monitoring System—Optional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.0 OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

5.1 Load Bus Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.1.1 Performance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.1.2 LBS Cable and Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.2 Configuring Parallel Sbasystem Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

5.2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

5.2.2 Features of Parallel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

5.2.3 Operating Principles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

5.2.4 Operation Modes Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

5.3 Installing Parallel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

5.3.1 Conditions for Parallel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

5.3.2 Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.3.3 Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.3.4 Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.3.5 Parallel Control Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.3.6 Emergency Power Off (EPO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

6.0 UPS SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

6.1 Conformity and Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.2 UPS Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.3 UPS Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.4 UPS Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

6.4.1 Input Rectifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

6.4.2 DC Intermediate Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

6.4.3 Inverter Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

6.4.4 Bypass Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

7.0 LIEBERT® BDC

7.1 Normal (UPS) Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

7.1.1 Bypass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7.2 Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7.3 Locating the Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7.4 Cable Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7.4.1 Wiring Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7.4.2 Power Cable Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7.4.3 Input/Output Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

7.5 Bolting Cabinets Together . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

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8.0 INSTALLATION DRAWINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

9.0 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

9.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

9.1.1 Bypass Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

9.1.2 Operating Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

10.0 OPERATOR CONTROL AND DISPLAY PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

10.1 Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

10.1.1 Display Panel Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

10.2 Mimic Display Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

10.3 Control Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

10.4 Audible Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

10.5 LCD Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

10.6 Navigation Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

10.7 UPS System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

10.8 LCD Menus and Data Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

10.9 Language Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

10.10 Current Date and Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

10.11 UPS Status Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

10.12 Types of LCD Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

10.12.1 Opening Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

10.12.2 Default Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

10.12.3 UPS Help Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

10.12.4 Screen Saver Window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

10.13 Pop-Up Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

10.13.1 From Bypass to Inverter Mode With Power Interruption . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

10.13.2 From Inverter to Bypass Mode With Interruption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

10.13.3 System Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

10.13.4 Battery Capacity Test Confirmation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

10.13.5 Battery Self-Test Aborted, Condition Not Met . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

10.13.6 Battery Refresh Charge Aborted, Condition Not Met . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

11.0 OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94

11.1 Liebert® NX™ Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

11.1.1 Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

11.2 UPS Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

11.2.1 Startup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

11.2.2 Verify Switching Between Operation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

11.3 Partially De-Energize the Liebert Nx 480 with Internal Maintenance Bypass . . . . . . . . . . 98

11.4 Partially De-Energize the Liebert Nx 480 with Bypass Distribution Cabinet (BDC) . . . . . 99

11.5 De-Energize the Liebert Nx 480 with Bypass Distribution Cabinet (BDC) . . . . . . . . . . . . 100

11.6 Energize Nx 480 with Bypass Distribution Cabinet (BDC). . . . . . . . . . . . . . . . . . . . . . . . . 100

11.7 Auto Restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

11.8 Emergency Shutdown With EPO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

11.9 Reset After Shutdown for Emergency Stop (EPO Action) or Other Conditions . . . . . . . . . 101

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11.10 Battery Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

11.10.1 Battery Undervoltage Pre-Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

11.10.2 Battery End-of-Discharge (EOD) Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

11.11 Multi-Module System Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

11.11.1 Isolating One Module in a Multi-Module System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

11.11.2 Inserting One Module into a Multi-Module System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

11.11.3 Shutdown Procedure—Complete UPS and Load Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . 105

11.12 Commissioning a Parallel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

11.13 Parallel System Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

12.0 OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106

12.1 Communication and Other User Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

12.1.1 Analog Input Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

12.1.2 Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

12.1.3 Liebert IntelliSlot Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

12.1.4 Communication and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

12.1.5 Configuring Baud Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

12.2 LBS Mode—Load Bus Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

12.2.1 Remote Alarm Monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

12.3 Replacing Dust Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

13.0 SPECIFICATIONS AND TECHNICAL DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

13.1 Lug Size and Torque Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

13.2 Cable Lengths: Floor to Connection Point Inside UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

13.3 Cable size and tightening torques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

13.4 Battery Run Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

APPENDIX A-UPS STATUS MESSAGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

FIGURES

Figure 1 Cabinet arrangement—Liebert® NX™ units and battery cabinets . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 2 Cabinet arrangement—Liebert

distribution cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 3 Single module block diagram—dual input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 4 Monitor board U2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 5 Auxiliary terminal block detail (Monitoring Board) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 6 Input dry contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 7 Output dry contacts and EPO wiring for firmware before M170 . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 8 EPO wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 9 Battery cabinets for Liebert

Figure 10 Battery cabinet—details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 11 Battery tray and supports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 12 Load Bus Synchronization cable connection in single module systems. . . . . . . . . . . . . . . . . . . . . 28

Figure 13 Load Bus Synchronization cable connection with multi-module systems . . . . . . . . . . . . . . . . . . . 29

Figure 14 Parallel system block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 15 Paralleling cabinet with input and bypass circuit breakers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 16 Paralleling cabinet with input, bypass and distribution circuit breakers. . . . . . . . . . . . . . . . . . . 31

Figure 17 Connecting system parallel control cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 18 Auxiliary dry contact cables for output breaker in multi-module system . . . . . . . . . . . . . . . . . . . 34

®

NX™ UPS, battery cabinets and Liebert NX bypass

®

NX™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

iv

Figure 19 Connecting EPO push button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 20 Single input UPS with external Liebert BDC with optional internal transformer—typical

configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Figure 21 Liebert
Figure 22 Liebert BDC connection to Liebert
Figure 23 Bolting a Liebert
Figure 24 Outline drawing, Liebert BDC

®

BDC connection to UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

®

NX™UPS to a Liebert BDC™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

®

NX™. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

™,

47" cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Figure 25 Outline drawing, Liebert NX 40-120kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Figure 26 Terminal details, 34" battery power pack system for Liebert
Figure 27 Liebert
Figure 28 Liebert
Figure 29 Liebert
Figure 30 Liebert
Figure 31 Liebert
Figure 32 Liebert
Figure 33 Liebert
Figure 34 Liebert
Figure 35 Liebert

®

NX™ 80-120kVA dimensions—front and left side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

®

NX™ 160-200kVA dimensions—front and left side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

®

NX™ 160-200kVA dimensions—front and left side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

®

NX™ 40-120kVA main components—typical unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

®

NX™ 160-200kVA dimensional view—front and left side . . . . . . . . . . . . . . . . . . . . . . . . 57

®

NX™ 160-200kVA dimensions continued—top and bottom view . . . . . . . . . . . . . . . . . . 58

®

NX™ 160-200kVA main components—typical unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

®

NX™ 40-120kVA cable connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

®

NX™ 160-200kVA cable connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

®

NX™ 480V UPS. . . . . . . . . . . . . . 52

Figure 36 Outline drawing, 33" battery power pack system, single cabinet . . . . . . . . . . . . . . . . . . . . . . . . . 62

Figure 37 Terminal details, 33" battery power pack system, single cabinet Liebert

®

NX™. . . . . . . . . . . . . 63

Figure 38 Outline drawing, 49" battery power pack system, single cabinet . . . . . . . . . . . . . . . . . . . . . . . . . 64

Figure 39 Terminal details, 49" battery power pack system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Figure 40 Liebert
Figure 41 Liebert
Figure 42 Outline drawing, Liebert
Figure 43 Outline drawing, Liebert
Figure 44 Liebert

®

NX™ 160-200kVA UPS to 49" battery cabinet interconnection . . . . . . . . . . . . . . . . . . . 66

®

NX™ 40-120kVA UPS to 33" battery cabinet interconnection . . . . . . . . . . . . . . . . . . . . 67

®

NX™ 480V paralleling cabinet with input and bypass circuit breakers, main

®

NX™ 480V 33" parallel cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

®

NX™ 480V 49" parallel cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Figure 45 Liebert

®

NX™ 480V paralleling cabinet main components—input, bypass and distribution

circuit breaker configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Figure 46 Main component location drawing Liebert
Figure 47 Liebert

®

NX™ 480V 40-120kVA UPS to Paralleling Cabinet

®

NX™ 480V, CB2, CB3, CB4 configurations . . . . . . 72

Interconnection—Configuration BB0, FB0, KB0 parallel connection to Liebert NX . . . . . . . . . . 73

Figure 48 Interconnecting details for Liebert

®

NX™ 40-120kVA UPS to paralleling cabinet with

input, bypass and distribution circuit breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Figure 49 Lineup detail—Configuration CB2, CB3, CB4 parallel connection to Liebert
Figure 50 Line-up detail, bolt together description, 40-120 kVA Liebert

®

NX™. . . . . . . . . . . . . . . . . . . . . . 76

®

NX™. . . . . . . . . . 75

Figure 51 Single module block diagram (dual input configuration) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Figure 52 Overview of control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Figure 53 Detailed view of control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Figure 54 Mimic display indicators location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Figure 55 Location of control buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Figure 56 Buzzer location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Figure 57 Sections of the LCD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Figure 58 Menu tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Figure 59 Language selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Figure 60 Set date and time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Figure 61 Current status and history log records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Figure 62 Opening display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Figure 63 Default screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

v

Figure 64 Help screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Figure 65 Screen saver window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Figure 66 Circuit breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Figure 67 Typical parallel system block diagram with common input supply, with separate batteries

and optional output / bypass distribution panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Figure 68 Monitoring board (U2) auxiliary terminal block detail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Figure 69 Liebert

®

IntelliSlot™ Web card display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Figure 70 MultiPort 4 card pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Figure 71 Dust filter replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

TABLES

Table 1 Input dry contacts at X3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 2 Maintenance bypass cabinet interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 3 BCB control interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 4 Output dry contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 5 EPO input contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 6 Environmental characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 7 UPS mechanical characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 8 UPS terminal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 9 Rectifier input power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Table 10 Input voltage window with derating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Table 11 Liebert-approved replacement batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Table 12 DC intermediate circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Table 13 Inverter output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 14 Bypass input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 15 Power cable size selection (Copper Wire Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Table 16 Control wiring for Liebert

Table 17 Circuit breaker schedule - Main circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Table 18 Main panelboard circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Table 19 Panelboard branch circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Table 20 Subfeed circuit breaker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Table 21 Square D I-Line panelboard circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Table 22 Weights, Liebert NX 40-120kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Table 23 Battery cabinet ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Table 24 Battery cabinet circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Table 25 UPS terminal specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Table 26 Electrical specifications, Liebert NX 160-200kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Table 27 Mimic display status indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Table 28 Control buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Table 29 Icons for navigation keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Table 30 Description of items in UPS system window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Table 31 Descriptions of UPS menus and data window items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Table 32 UPS operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Table 33 Liebert

®

NX™ communication options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Table 34 Torque specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Table 35 Battery torque rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Table 36 Distance to connection points on the Liebert NX UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Table 37 Parallel system current table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Table 38 External cabinet dimensions, including side panels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Table 39 Cable size tightening torque at Liebert

Table 40 Cable size tightening torque at Liebert NX 60kVA UPS terminals. . . . . . . . . . . . . . . . . . . . . . . 112

®

NX™ UPS to Liebert BDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

®

NX™ 40kVA UPS terminals . . . . . . . . . . . . . . . . . . . . 112

vi

Table 41 Cable size tightening torque at Liebert NX 80kVA UPS terminals. . . . . . . . . . . . . . . . . . . . . . . 112

Table 42 Cable size tightening torque at Liebert

®

NX™ 100kVA UPS terminals . . . . . . . . . . . . . . . . . . . 113

Table 43 Cable size tightening torque at Liebert NX 120kVA UPS terminals. . . . . . . . . . . . . . . . . . . . . . 113

Table 44 Cable size tightening torque at Liebert NX 160kVA UPS terminals. . . . . . . . . . . . . . . . . . . . . . 113

Table 45 Cable size tightening torque at Liebert NX 200kVA UPS terminals. . . . . . . . . . . . . . . . . . . . . . 113

Table 46 Cable size tightening torque at Liebert NX 480V Battery Cabinet DC input bus terminals. . . 113

Table 47 Enersys battery run times in minutes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Table 48 C&D Dynasty battery run times in minutes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Table 49 UPS status messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

vii

viii

IMPORTANT SAFETY INSTRUCTIONS

!

!

!

SAVE THESE INSTRUCTIONS

This manual contains important instructions that should be followed during installation of your
Liebert

Read this manual thoroughly, paying special attention to the sections that apply to your installation,
before working with the UPS. Retain this manual for use by installing personnel.

®

NX™ UPS and ancillary equipment.

WARNING

Risk of heavy unit tipping over. Can cause property damage, injury and death.

Exercise extreme care when handling UPS cabinets to avoid equipment damage or injury to
personnel. The UPS module weight ranges from 1180 to 2205 lb. (535 to 1000kg).

Determine unit weight and locate center of gravity symbols
before handling the UPS. Test lift and balance the cabinet
before transporting. Never tilt equipment more than 15 degrees from vertical.

Battery manufacturers supply details of the necessary precautions to be observed when
working on, or in the vicinity of, a large bank of battery cells. These precautions should be
followed implicitly at all times.

Follow all battery safety precautions when installing, charging or servicing batteries. In
addition to the hazard of electric shock, gas produced by batteries can be explosive and
sulfuric acid can cause severe burns. When connected, the nominal battery voltage is 480VDC
and is potentially lethal.

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

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

Check for voltage with both AC and DC voltmeters prior to making contact.

WARNING

Risk of electric shock. Can cause injury and death.

Dangerous voltages are present within the UPS and battery enclosure. The risk of contact
with these voltages is minimized as the live component parts are housed behind a hinged,
lockable door. Further internal safety screens make the equipment protected to IP20
standards.

No risk exists to any personnel when operating the equipment in the normal manner,
following the recommended operating procedures.

All equipment maintenance and servicing procedures involve internal access and should be
carried out only by trained personnel.

WARNING

Risk of electric shock from high leakage current. Can cause injury, property damage and
death.

High ground leakage current: Ground connection is essential before connecting the input
supply.

This equipment must be grounded in accordance with local electrical codes.

Maximum load must not exceed that shown on the UPS rating label.

1

!

WARNING

!

Risk of electric shock. Can cause injury and death.

Under typical operation and with all UPS doors closed, only normal safety precautions are
necessary. The area around the UPS system should be kept free of puddles of water, excess
moisture and debris.

Special safety precautions are required for procedures involving handling, installation and
maintenance of the UPS system and the batteries. Observe all safety precautions in this
manual before handling or installing the UPS system. Observe all precautions in this manual,
before as well as during performance of all maintenance procedures. Observe all battery
safety precautions before working on or near the battery.

This equipment contains several circuits that are energized with high voltage. Only
test equipment designed 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 electric charges
may exist within the UPS.

All power and control wiring should be installed by a qualified electrician. All power
and control wiring must comply with the NEC and applicable local codes.

ONLY qualified service personnel should perform maintenance on the UPS system.
When performing maintenance with 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).

Never work alone, even if all power is removed from the equipment. A second person should
be standing by to assist and summon help in case an accident should occur.

CAUTION

This equipment is fitted with RFI suppression filters.
Ground leakage current exceeds 3.5 mA and is less than 30 mA.
Transient and steady-state ground leakage currents, which may occur when starting the

equipment, should be taken into account when selecting instantaneous residual current
circuit breakers (RCCBs) or residual current devices (RCDs).

RCCBs must be selected sensitive to DC unidirectional pulses (Class A) and insensitive to
transient current pulses.

Note also that the ground leakage currents of the load will be carried by this RCCB or RCD.

NOTICE

Risk of improper improper electromagnetic shielding. Can cause radio communication
interference.

This unit complies with the limits for a Class A digital device, pursuant to Part 15 Subpart J
of the FCC rules. These limits provide reasonable protection against harmful interference in a
commercial environment. This unit generates, uses and radiates radio frequency energy and,
if not installed and used in accordance with this instruction manual, may cause harmful
interference to radio communications. This unit is not designed for use in a residential area.
Operation of this unit in a residential area may cause harmful interference that the user must
correct at his own expense.

2

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 4.0 - Battery Installation.

WARNING

Risk of electric shock. Can cause injury, property damage and death.
Special care should be taken when working with the batteries associated with this equipment.

Batteries are always live. Battery terminal voltage will exceed 480VDC and is potentially
lethal.

In addition to the hazard of electric shock, gas produced by batteries can be explosive and
sulfuric acid can cause severe burns.

Batteries should be installed, serviced and replaced only by properly trained and qualified
service personnel trained in safe battery handling methods and who have the correct PPE
(Personal Protection Equipment) and tools.

The following precautions should be observed when working with the batteries:

• Eye protection should be worn to prevent injury from electrical arcs.

• Remove rings, watches and all other metal objects.

• Use only tools with insulated handles.

• Wear rubber gloves and boots.

• When replacing batteries, replace them with the same type and number of batteries or bat­tery packs.

• Do not dispose of batteries in a fire. The batteries may explode.

• Do not open or mutilate batteries. Released electrolyte is harmful to the skin and eyes. It is
toxic.

• Never lay metal objects of any type on top of the batteries.

• Disconnect the charging source before connecting or disconnecting battery terminals.

• Determine whether the battery is grounded. If the battery is grounded, remove source of
the ground. Contact with any part of a grounded battery can result in electrical shock. The
likelihood of such shock can be reduced if such grounds are removed during installation and
maintenance.

WARNING

Risk of heavy unit tipping. Can cause property damage, injury and death.

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).

WARNING

Risk of electric shock. Can cause injury and death.

The Liebert
Off. To minimize the risk of injury, a properly trained and qualified service person should
disconnect the batteries before any maintenance is performed on the unit.

Servicing of batteries should be performed or supervised only by properly trained and
qualified personnel knowledgeable about batteries and the required precautions.

When replacing batteries, replace with the same manufacturer and type, or equivalent. See
your local Emerson

®

NX’s internal batteries are connected and energized even if the UPS is turned

®

representative for a list of approved batteries.

3

!

CAUTION

Risk of replacing battery with an incorrect type. Can cause property damage injury and
death.

Dispose of used batteries according to the instructions.

When replacing batteries, replace with the same manufacturer and type, or equivalent. See
your local Emerson representative for a list of approved batteries.

4

GLOSSARY OF SYMBOLS

!

PbH2SO4

-

+

R

Risk of electrical shock

Indicates caution followed by important instructions

AC input

AC output

i

Requests the user to consult the manual

Indicates the unit contains a valve-regulated lead acid battery

Recycle

DC voltage

Equipment grounding conductor

Bonded to ground

AC voltage

5

1.0 INTRODUCTION

The Liebert® NX™ Uninterruptible Power Supply system provides continuous, high-quality AC power
to your business-critical equipment, such as telecommunications and data processing equipment.

The Liebert NX UPS is a SmartAisle
approach.

The Liebert NX 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 NX 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.

Introduction

™

technology, appropriate for use with the SmartAisle design

6

2.0 INSTALLATION

!

!

!

This section describes the Liebert® NX™ environmental requirements and mechanical considerations
that must be taken into account when planning the positioning and cabling of the UPS equipment.

Because every site is unique, this section presents a guide to general procedures and practices that
should be observed by the installing engineer, rather than step-by-step installation instructions.

WARNING

Do not apply electrical power to the UPS equipment before the arrival of the commissioning
engineer.

WARNING

The UPS equipment should be installed by a qualified engineer in accordance with the
information contained in this section.

WARNING

Risk of electric shock. Can cause injury and death.

Special care should be taken when working with the batteries associated with this equipment.
When connected together, the nominal battery voltage is 480VDC and is potentially lethal.

• Eye protection should be worn to prevent injury from accidental electrical arcs.

• Remove rings, watches and all other metal objects.

• Use only tools with insulated handles.

• Wear rubber gloves.

If a battery leaks electrolyte or is otherwise physically damaged, it must be replaced, stored in
a container resistant to sulfuric acid and disposed of in accordance with local regulations.

If electrolyte comes into contact with skin, the affected area should be washed immediately
with large amounts of water.

Installation

NOTE

The Liebert NX UPS can be used in TN utility system.

2.1 External Inspections

1. While the UPS system is still on the truck, inspect the equipment and shipping container(s) for
any signs of damage or mishandling. Do not attempt to install the system if damage is apparent.
If any damage is noted, file a damage claim with the shipping agency within 24 hours and contact
Emerson Network Power
claim and the condition of the equipment.

2. Compare the contents of the shipment with the bill of lading. Report any missing items to the
carrier and your local Liebert representative immediately.

2.2 Internal Inspections

1. Remove any packaging material, then visually examine the UPS and battery equipment for
transit damage, both internally and externally. Report any such damage to the shipper and to
Liebert immediately.

2. Check the nameplate inside the cabinet door to verify that the model number and rating
correspond to the ones specified. Record the model number and serial number in the front of this
installation manual. This information is necessary should service be required.

3. Check for loose connections or unsecured components in the cabinet.

4. Check for shipping damage to internal components.

®

Liebert Services at 1-800-LIEBERT to inform them of the damage

7

2.2.1 Storing for Delayed Installation

If the equipment will not be installed immediately, it must be stored indoors where the humidity is no
higher than 90% and the temperature is no higher than 104°F (40°C). The storage area must protect
the Liebert

®

NX™ from excessive moisture (see 6.2 - UPS Environmental).

NOTE

If the battery cabinet must remain disconnected from power for more than six (6) months, the
battery must be recharged before use. To charge the batteries, the battery cabinet must be
connected to the Liebert NX UPS and the UPS must be connected to utility power and started
up because the charger operates only while the Liebert NX UPS is operating

NOTE

When batteries are installed in a cabinet adjacent to the UPS unit, the battery—not the
UPS—dictates the designed maximum ambient operating temperature.

2.3 Preliminary Checks

2.3.1 Identification

The equipment supplied has an identification tag on the back of the main door listing the type and
size of the UPS.

2.4 UPS Location

2.4.1 Positioning the UPS

Choose a location for the UPS that offers:

• Easy connection to inputs, outputs and auxiliary equipment

• Enough space to service the UPS

• Air circulation sufficient to expel heat produced by UPS

• Protection against moisture and excessive humidity

• Protection against dust and other particulate matter

• Compliance with fire prevention regulations and practices

• Operating environment temperature of 74-80°F (23-27°C) for maximum battery efficiency

2.4.2 Environmental Considerations

Installation

Before installing the Liebert NX, verify that the UPS room satisfies the environmental conditions
stipulated in 6.2 - UPS Environmental, paying particular attention to the ambient temperature
and air exchange system.

The UPS unit should be installed in a cool, dry, clean-air environment with adequate ventilation to
keep the ambient temperature within the specified operating range 32°F to 104°F (0°C to 40°C).

For optimal UPS and battery system performance and service life, maintain the operating
temperature within the range of 74-80°F, (23-27°C).

The Liebert NX UPS cooled by internal fans. Cooling air enters the unit through the front of the unit
and is exhausted out the top. To permit proper air flow and prevent overheating, do NOT block or
cover the ventilation openings or blow air down onto the unit. Ventilation clearance above the unit
must be a minimum of 8 in. (203mm).

See Table 7 for details on heat dissipation.

8

Battery Location

!

!

Batteries must be installed in Liebert® NX™ 480V battery cabinets or battery room. Temperature is a
major factor in determining battery life and capacity. Battery manufacturers recommend an
operating temperature of 77°F (25°C). Ambient temperatures higher than this reduce battery life;
temperatures lower than this reduce battery capacity. In a typical installation, battery temperature
should be maintained between 74°F and 80°F (23-27°C). Batteries should be placed where there are
no main heat sources or air inlets to prevent portions of batteries from being either much warmer or
much cooler than other parts of the batteries.

2.4.3 Special Considerations for Parallel Systems

1. Consider the grounding configuration of your system before finalizing module placement. For
optimal ground performance, the Liebert NX modules should be close together.

2. For optimal load-sharing performance, the UPS output cables should be approximately the same
length, plus or minus 20 percent.

3. Position modules in such a way as to minimize the length of power cables and control wiring
between UPS modules and the paralleling cabinet.

2.5 Considerations in Moving the Liebert NX

Ensure that the UPS weight is within the designated surface weight loading (lb./ft2 or kg/cm2) of any
handling equipment. See Table 7 for weights of various units.

To move the UPS and optional battery cabinets:

• The Liebert NX may be rolled on its casters when moving the unit a short distance. For longer dis­tances, move the UPS with a forklift or similar equipment to ease the relocation and to reduce
vibration.

Installation

The optional battery cabinets should be moved with a forklift or similar equipment.

WARNING

Risk of heavy unit falling. Can cause property damage, injury and death.

Ensure that any equipment that will be used to move the Liebert NX has sufficient lifting
capacity. The Liebert NX weight ranges from 1180 to 2201 lb. (535 to 1000kg). See Table 7 for
details. The UPS presents a tipping hazard. Do not tilt the Liebert NX further than 15
degrees from vertical.

The UPS is fitted with casters—take care to prevent movement when unbolting the
equipment from its shipping pallet. Ensure adequate personnel and lifting equipment are
available when taking the Liebert NX off its shipping pallet. Do not tilt the unit more than 15
degrees from center.

WARNING

Risk of heavy unit falling. Can cause property damage, injury and death.

The casters are strong enough for movement across even surfaces only. Casters may fail if
they are subjected to shock loading, such as being dropped or rolled over holes in the floor or
obstructions. Such failure may cause the unit to tip over, injuring personnel and damaging
the equipment.

Care must be taken when maneuvering cabinets fitted with batteries. Keep such moves to a
minimum. For further information, see Battery Cabinet Precautions on page 3.

Final Position

When the equipment has been finally positioned, ensure that the adjustable stops are set so that the
UPS will remain stationary and stable (see 8.0 - Installation Drawings).

9

2.6 Mechanical Considerations

!

The Liebert NX is constructed with a steel frame and removable panels. Top and side panels are
secured to the chassis by screws. The doors may be opened for access to power connections bars,
auxiliary terminal blocks and power switches.

The UPS comes with an operator control panel, which provides basic operational status and alarm
information. Cooling is provided by internal fans. The unit sits on four casters. Adjustable stops are
provided to prevent the UPS from moving once it has been moved to its final position.

2.6.1 Clearances

There are no ventilation grilles on the sides or rear of the UPS. The unit may be placed with the rear
against a wall and optional cabinets on either side.

Installation

To enable routine tightening of power terminations within the UPS, make sure there is sufficient
clearance in front of the Liebert

Leave a minimum of 8 in. (203mm) between the top of the UPS and the ceiling to permit adequate air
circulation above the unit. Liebert recommends against using air conditioning or other systems that
blow air onto the top of the unit.

2.6.2 Floor Installation

The diagrams in 8.0 - Installation Drawings show the location of holes in the base plate for bolting
the equipment to the floor.

If the equipment is to be placed on a raised floor, it should be mounted on a pedestal that will support
the equipment point loading. Refer to the cabinet-bottom views in 8.0 - Installation Drawings to
design this pedestal.

2.6.3 Cable Entry

Cables can enter the Liebert NX from the top or bottom. Cable entry is made possible by removing a
metal plate attached to the UPS.

These plates are designed to allow the personnel to punch holes for fitting and securing the conduit.
Once the conduit holes are punched, these plates should be reattached to the UPS.

WARNING

Risk of explosion and fire. Can cause property damage, injury and death.

To reduce the risk of fire, connect only to a circuit provided with correct amperes maximum
branch circuit overcurrent protection (see Table 8) in accordance with the National Electric
Code, ANSI/NFPA 70.

®

NX™ to permit free passage of personnel with the door fully opened.

NOTE

When installing the UPS, the customer must provide a disconnect with overcurrent protection
at the output of the UPS.

System Composition

A UPS system can comprise a number of equipment cabinets, depending on the individual system
design requirements—e.g., UPS cabinet with External Bypass cabinet and Maintenance Bypass
cabinet. In general, all cabinets used will be the same height and are designed to be positioned side­by-side to form an aesthetically appealing equipment suite.

10

2.6.4 Optional Cabinets

Front of Units

Battery
Cabinet

Battery
Cabinet

Battery
Cabinet

Liebert

NX

UPS

Front of Units

Battery
Cabinet

Battery
Cabinet

Battery

Cabinet

Liebert

NX

UPS

Front of Units

Multi-Module

Parallel Cabinet

Battery
Cabinet

Battery
Cabinet

Battery
Cabinet

Liebert

NX

UPS

Liebert

NX

UPS

Liebert

NX

UPS

Liebert

NX

UPS

Battery
Cabinet

Front of Units

Front of Units

Battery

Cabinet

Liebert

NX

UPS

Battery

Cabinet

Liebert

NX

UPS

The Maintenance Bypass Cabinet must be cabled and bolted to the Liebert NX before the UPS and
bypass cabinet are moved into their final position. Connect the input wiring to the Maintenance
Bypass Cabinet ONLY after the units are connected and positioned.

Battery cabinets may be bolted to either side of the Liebert NX; see Figure 1.

Figure 1 Cabinet arrangement—Liebert

®

NX™ units and battery cabinets

Installation

11

Installation

Front of Units

Liebert NX

Bypass

Distribution

Cabinet

Battery
Cabinet

Liebert

NX

UPS

Front of Units

Liebert NX

Bypass

Distribution

Cabinet

Battery

Cabinet

Battery

Cabinet

Battery
Cabinet

Liebert

NX

UPS

Figure 2 Cabinet arrangement—Liebert® NX™ UPS, battery cabinets and Liebert NX bypass distribution

cabinets

12

3.0 ELECTRICAL CONNECTIONS

!

The UPS requires both power and control cabling once it has been mechanically installed. All control
cables must run separate from power cables in metal conduits or metal ducts that are electrically
bonded to the metalwork of the cabinets to which they are connected.

WARNING

Risk of electrical shock. Can cause injury and death.

Before connecting input power to the Liebert
and operation of the overcurrent protection devices that connect the UPS input/bypass supply
to the power distribution panel.

De-energize and lockout or tagout all incoming high- and low-voltage power circuits before
installing cables or making any electrical connections.

3.1 Power Cabling

3.1.1 Cable Rating

The main factors affecting the choice and size of cable are voltage, current (also taking into account
overcurrent), room temperature and conditions of installation of the cable.

The power cables of the system must be sized with respect to the following description:

Electrical Connections

®

NX™, ensure that you are aware of the location

• UPS input cables - The UPS input cables must be sized for the maximum input current, includ­ing the maximum battery recharge current, given in Table 8, with respect to the unit rating and
the input AC voltage.

• UPS bypass and output cables - The bypass and output cables must be sized for the nominal
output current, given in Table 8, with respect to the unit rating and the output AC voltage.

• Battery cables - When connecting an external battery cabinet, the battery cables must be sized
for the battery discharge current at the end-of-discharge voltage, as given in Table 8, with
respect to the unit rating.

NOTE

Table 8 gives nominal currents for determining the size of UPS power cables. Other important
factors to consider include cable route length and coordination with protective devices.

The power cables can be sized to suit the UPS unit rating according to Table 8.

NOTE

When installing a Liebert NX with Softscale
bypass and output cabling for the UPS’s maximum rating. Properly sizing the cable will
reduce the work required to upgrade the UPS.

™

capability Liebert recommends sizing the input,

Lug Size and Torque Requirements

Refer to Table 34 for lug size and torque requirements.

13

3.1.2 UPS Input Configuration

3-Phase
3W + Gnd

3-Phase
3W + Gnd

AC Input

AC Output

3-Phase
3W + Gnd

Battery Cabinet

2W + Gnd

UPS Cabinet

Conv erter

InverterRectifier

Static Bypass

Internal Maintenance Bypass

Figure 3 illustrates the Liebert® NX™ in a split bypass (dual-input) configuration. In this
configuration, the Static Bypass and the Maintenance Bypass lines are supplied from a separate feed
from the Main input. Both sources must be protected externally with properly sized protective
devices. By default, the unit ships with internal links installed between the bypass input and main
input (Single Input configuration). To wire the unit as a dual input UPS, remove the links and wire
the bypass to the input bus bars, then wire the main input directly to CB1 (see Figure 3).

Figure 3 Single module block diagram—dual input configuration

Electrical Connections

3.1.3 Cabling Guidelines

The following are guidelines only and are superseded by local regulations and codes of practice where
applicable. Use wiring rated at 75°C or greater.

1. The ground conductor should be sized in accordance with the input overcurrent protection device
data in Table 8. The ground cable connecting the UPS to the main ground system must follow the
most direct route possible. Control wiring and power wiring must be run in separate conduit.
Output and input cables must be run in separate conduit.

2. Consider using paralleled smaller cables for heavy currents—this can ease installation.

3. When sizing battery cables, a maximum voltage drop of 4VDC is permissible at the current
ratings in UPS terminal. For terminal connection sizing, see Table 8.

4. In most installations, especially parallel multi-module systems, the load equipment is connected
to a distribution network of individually protected busbars fed by the UPS output, rather than
connected directly to the UPS itself. When this is the case, the UPS output cables can be rated to
suit the individual distribution network demands rather than being fully load-rated.

NOTE

If more load is added to the distribution panel, the unit’s cabling must be resized.

5. When laying power cables, do not form coils; this will help avoid increasing formation of
electromagnetic interference.

14

3.1.4 Cable Connections

!

Electrical Connections

The rectifier input, bypass and output are easily accessible from the front of the unit for installation.
All require lug type terminations. They are connected to busbars on the front side of the Liebert
and below the circuit breaker, as shown in Figure 3. These busbars are accessible when the front
side panel is removed. Busbars to connect external batteries are accessible from the front of the UPS.

NOTE

External connection access requires removal of a protective panel on the lower front of the UPS.

NOTE

There is no battery fuse in the UPS; the battery cabinet must include a circuit breaker
to cut off the current in case of short circuit. Refer to Table 8 for current ratings.

3.1.5 Safety Ground

The safety ground busbar is located below the Maintenance Bypass circuit breaker or to the right of
the UPS Output breaker for 160-200KVA models as shown in Figure 3. The safety ground cable must
be connected to the ground busbar and bonded to each cabinet in the system.

All cabinets and cable conduit should be grounded in accordance with local regulations.

WARNING

Risk of electrical shock from ground fault. Can cause injury and death.

Failure to follow proper grounding procedures can result in electric shock hazard to personnel
or the risk of fire, should a ground fault occur.

NOTE

Proper grounding significantly reduces electromagnetic interference problems in systems.

®

NX™

NOTE

The ground busbar is easily accessible when the lower protective cover plate is removed.

3.1.6 Protective Devices

For safety, it is necessary to install circuit breakers in the input AC supply and external battery
battery cabinets, external to the UPS system. Given that every installation has its own
characteristics, this section provides guidelines for qualified installation engineers with knowledge of
operating practices, regulatory standards and the equipment to be installed.

UPS Rectifier and Bypass Input Supply

• Protection from excessive overcurrents and short circuits in power supply input
External overcurrent protection for the AC output circuit is to be provided. See 6.4 - UPS

Electrical Characteristics and Table 9 for overload capacity.
When an external battery supply not made by Liebert is used, the customer must provide

overcurrent protection for the battery circuit.

• Dual Input

When wiring the UPS with dual inputs, the Rectifier input and the Bypass input must be
protected separately. Size the breakers according to the input currents shown in Table 8.

15

3.1.7 Cabling Procedure

NOTICE

Risk of improper installation. Can cause improper operation and void warranty.
The operations described in this section must be performed by authorized electricians or

qualified technical personnel. If you have any difficulties, contact your local Liebert
representative or Liebert Services.

NOTE

Hydraulic pressure pliers, combinative tools and piston ring pliers should be used to connect
AC wiring.

Once the equipment has been positioned and secured for operation, and the battery and ground
collars have been connected (see 3.1.4 - Cable Connections), connect the power cables as described
below. (Study the reference drawing in 8.0 - Installation Drawings.)

1. Verify that all incoming high and low voltage power circuits are de-energized and locked out or
tagged out before installing cables or making any electrical connections.

2. Remove the front protective cover to gain easier access to the connections busbars.

3. Connect the safety ground and bonding ground bus cables to the copper ground busbar located on
the bottom of the equipment below the power connections. All cabinets in the UPS system must be
connected to the user’s ground connection.

Electrical Connections

®

NOTE

The grounding bonding arrangement must comply with the National Electrical Code and all
applicable local codes.

4. Identify and make power connections with incoming cables according to Steps 5 through 11.

Common Input Connections

5. For common bypass and rectifier inputs, connect the AC input supply cables between the power
distribution panel and the UPS input busbars (A-B-C terminals) and tighten the connections to
88 lb-in. (10 N-m) using the M8 bolt provided.

Dual Input Connections

6. Remove the internal links installed between the Input circuit breaker (CB1) busbars and Bypass
Input busbars as shown in Figure 3.

7. For the bypass, connect the AC input supply cables between the power distribution panel and the
UPS Rectifier Input busbars (CB1 A-B-C terminals) and tighten the connections to 88 lb-in.
(10 N-m) using the M8 bolt provided.

8. For the Rectifier Input, connect AC input supply cables between the power distribution panel and
the UPS Rectifier Input busbars (CB1 A-B-C terminals).

16

Electrical Connections

!

NOTE

Both the rectifier and bypass feeds must come from the same utility source. The UPS can be
powered from separate sources provided all the following conditions are met:

1. The transformers are delta/wye isolation transformers where the wye secondary’s are
connected to the NX 480V UPS.

2. The individual transformer used to supply the Bypass of the NX 480V is solidly bonded to
earth ground at the transformer.

3. The individual transformer used to supply the Input (rectifier) of the NX 480V is solidly
bonded to earth ground at the transformer.

4. There are no appreciable ground currents flowing between the two transformers.

5. No delta/delta (ungrounded or corner grounded) transformers are used as a source to the
NX 480V UPS.

6. No high resistance or low resistance grounds can be used in the neutral bonding path to
ground of the delta/wye isolation transformers described above in Items 2 and 3.

7. All applicable NEC standards and wiring rules are enforced.

8. The internal bypass to input (rectifier) shorting bars in the NX 480V UPS are removed.

The above all apply to single-module systems.

9. For 1+N paralleled system, the Bypass to each unit must be fed from the same utility
source.

Output System Connections—Ensure Correct Phase Rotation

10. Connect the system output cables between the UPS output busbars (A-B-C terminals) and the
critical load and tighten the connections to 88 lb-in. (10 N-m) (M8 bolt).

WARNING

Risk of electric shock. Can cause injury and death.

If the load equipment will not be ready to accept power on the arrival of the commissioning
engineer, then ensure that the system output cables are safely isolated.

Observe the battery cable polarity. Be sure that the battery connector is made with the
correct polarity.

11. Refit all protective covers removed for cable installation.

Frequency Converter Mode

If a frequency converter configuration is used, connect the AC input supply cables to the rectifier
input busbars (A-B-C terminals). Torque to 88 lb-in (10N-m) for M8 bolts. Ensure correct phase
rotation. There will not be any AC bypass supply cables to the bypass input (A-B-C terminals) and
tighten the connections.

NOTE

The operations described in this section must be performed by authorized electricians or
qualified technical personnel. If any difficulties arise, contact Liebert

NOTE

For frequency converter operation, ensure that the linking busbars between the bypass and the
rectifier input are removed.

®

at 1-800-LIEBERT.

17

3.2 Control Cables

X1

User Interface

Board

U1

DSP Control

K1

Key & LED Board

U2

Monitor Board

M3

Parallel Logic

Board

M5

Auxiliary Power

3.2.1 Monitor Board Features

Based on your site’s specific needs, the UPS may require auxiliary connections to manage the battery
system (external battery circuit breaker, battery temperature sensor), communicate with a personal
computer or provide alarm signaling to external devices or for Remote Emergency Power Off (REPO).
The monitor board, arranged for this purpose, is located on the rear of the operator access door. The
main features are:

• Input and Output dry contacts signal (one pair of contacts of relay)

• Emergency Power Off control (EPO)

• Environmental parameter input interface

• User communication (for data setting and user background monitor)

•Liebert

• Modem interface

• Temperature detect interface

Figure 4 shows the relationship and connection between the monitoring (U2) board and other boards
in the UPS.

Figure 4 Monitor board U2

®

IntelliSlot® interface

Electrical Connections

18

Figure 5 Auxiliary terminal block detail (Monitoring Board)

NOTE: The black square ()
on each slot indicates Pin 1.

J3

J1

J13 J21 J25 J28 J4 J26 J30 J10

J22

J23

J12

J9

J15

J17

J24

X4

X4

J16

X1

X2

X3

Liebert IntelliSlot 2

Liebert IntelliSlot 1

Liebert IntelliSlot 3

J8

J2

LCD

BFP INV ACF EPO Dry in MBC BCB

X5

X6

X7

PWR
MODEM
SNMP CARD

Electrical Connections

19

3.3 Dry Contacts

+12V

GEN

BtG

ENV

GND

GND

+12V

AUX_I

T_IT

AUX_ 0

T_0T

F_F AN

FUSE

OL

FB

DRV

+12V

+12V+12V

+12V

X3

J4 J26 J30 J10

NOTE: The black square () on each slot indicates Pin 1.

The UPS provides input dry contacts and output dry contacts.

NOTE

When operating the Liebert® NX™ with dry contacts, ESD measures must be taken or the
contacts may be damaged.

3.3.1 Input Dry Contacts

There are several input dry contacts at the X3 slot.

Figure 6 Input dry contacts

Electrical Connections

Table 1 Input dry contacts at X3

Position

J4.1 ENV
J4.2 BtG Battery Ground Fault Detection (Normally Closed)
J4.3 GEN
J4.4 +12V +12V Power

1 - Must be configured using configuration software before becoming active.
2 - When activated, the charger current can be limited, via software, to a percentage of the full charger current (0-100%).
3 - Activating this feature turns the battery charger off.

Name

1,2

Description

3

Battery Room Alarm (Normally Closed)

Generator Detection (Normally Open)

3.3.2 Maintenance Bypass Cabinet Interface

J26 and J30 are the MBC interface.

Table 2 Maintenance bypass cabinet interface

Position

J26.1 T_IT

J26.2 AUX_I Reserved

J26.3 +12V +12V Power

J26.4 GND Power Ground

J30.1 FUSE Reserved

J30.2 F_FAN Fan Fail Alarm (N.C.)

J30.3 T_OT

J30.4 AUX_O Reserved

1

- Must be configured using configuration software before becoming active.

Name

Description

1

Input transformer over temperature (N.C.)

1

Output Transformer Overtemperature (N.C.)

NOTE

All auxiliary cables of terminal must be double-insulated. The wire must be 600V, 18-16 AWG
stranded for maximum runs between 82 and 197 feet (25-60m), respectively.

20