Emerson 250-400kVA User Manual
AC Power
For Business-Critical Continuity™
Liebert® NXL
Operation and Maintenance Manual – 250-400kVA, 60Hz, Three Phase Single-Module
™
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 and
3.4 - 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).
Contacting Liebert 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: _____________________________________________________
Battery Reserve Time: _________________________________________________________
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2.1 Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2.2 Bypass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.3 Battery Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.4 Maintenance Bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.0 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Touchscreen Navigation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2.1 Main Display Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2.2 Configurations Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.3 Status Reports Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.4 Startup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.5 Shutdown Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.2.6 Transfer Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.2.7 Battery Management Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.2.8 Metering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.2.9 Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.2.10 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.2.11 Silence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3 Modes of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.1 Load on Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.2 OK to Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.3.3 Input Power Failure—Load on Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.3.4 Off Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.3.5 Emergency Module Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.3.6 Remote Emergency Power Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.4 Manual Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.4.1 Startup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.4.2 Load Transfer Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.4.3 Maintenance Bypass Load Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.5 Shutdown Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.5.1 Module Shutdown Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.6 Automatic Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.6.1 Overloads (Without Transfer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.6.2 Automatic Transfers to Bypass (Overload Condition) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.6.3 Automatic Transfers to Bypass, UPS System Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.6.4 Automatic Retransfers to UPS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.0 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
3.1 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
i
3.2 Liebert Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.2.1 Professional Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.3 Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.3.1 Record Log. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.3.2 Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.3.3 Limited Life Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.4 Battery Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.4.1 Battery Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.4.2 Torque Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.5 Detecting Trouble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.6 Reporting a Problem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
3.7 Corrective Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
3.8 Upstream Feeder Circuit Breaker Setting Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.0 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
4.1 Battery Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4.2 Environmental Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
APPENDIX A-UPS ALARM AND STATUS MESSAGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A43
ii
FIGURES
Figure 1 Typical UPS system one-line diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Figure 2 Main component locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3 Main Display Screen, typical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4 Mimic display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 5 Monitor/mimic display example: Normal power flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 6 Monitor/mimic display example: Utility fail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 7 Monitor/mimic display example: Load on bypass, UPS On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 8 Monitor/mimic display example: Load on bypass, UPS module off . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 9 Menu tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 10 Rating Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 11 System Settings parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 12 Adjustable setpoints parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 13 Battery Management Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 14 Typical Event Management Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 15 Shutdown menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 16 UPS shutdown popup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 17 System shutdown popup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 18 Transfer/retransfer commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 19 Time remaining display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 20 Battery cycle monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 21 Battery cycle monitor summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 22 Battery cycle monitor—clear log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 23 Load on bypass (UPS not available). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 24 Load on bypass, UPS available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 25 Load on UPS, bypass available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 26 Input power fail, load on battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 27 Load on UPS, battery not available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 28 Emergency modules off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 29 Remote emergency power off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 30 Startup commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 31 UPS with two-breaker bypass cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 32 Current-versus-time curves of overload capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
TABLES
Table 1 UPS component service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 2 Battery voltage, nominal and float . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 3 Battery retorque values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 4 Torque specifications, unless otherwise labeled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 5 Environmental specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 6 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 7 Liebert NXL alarm and status messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
iii
iv
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 batteries.
WA R N I NG
!
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 battery safety precautions in 3.0 - Maintenance 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.
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 battery disconnected, high voltage at filter capacitors and power
circuits should be discharged within 30 seconds. 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.
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 battery precautions when near the battery 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 battery.
1
1.0 INTRODUCTION
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 batteries— into AC power for the load. The batteries 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 maintenance bypass.
Figure 1 Typical UPS system one-line diagram
Bypass
BFB
Introduction
Input
Battery
System
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 batteries.
MBD
DC Bus
Module
CB2CB1
Output
2
1.2.2 Bypass Mode
When the Liebert NXL is in bypass mode, the load is directly supported by utility power and is without battery 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.
1.2.3 Battery Mode
When utility AC power fails, the Liebert NXL protects the critical load by instantaneously channeling
battery 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.
Introduction
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 - Opera-
tion.
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. The first three battery
items are required to complete the UPS system. The remaining options provide improved system performance or convenience. 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. This option is required to complete the UPS system.
• 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. This
option is required to complete the UPS system.
• Input Current Distortion Filter—This filter reduces input current reflected harmonic distortion to less than 7% reflected THD at full load. The filter is factory-installed in the UPS. This filter also improves the input power factor to better than 0.92 lagging at full load.
• Two Breaker Maintenance Bypass—This switchboard provides make-before-break maintenance bypass. It includes: Maintenance Bypass Breaker (MBB) and Maintenance Isolation
Breaker (MIB).
3
Introduction
• Load Bus Synchronization—The Load Bus Sync (LBS) option keeps two independent UPS sys-
tems (and therefore their critical load buses) in sync, even when the modules are operating on batteries 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 of up to 19 characters. The following attributes can be programmed for each alarm: latching, audible, event log and
time delay (0 to 99.9 seconds).
• 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. The UPS then compares the test results to data collected during the
UPS commissioning to see if the battery system appears to meet specifications.
The Liebert NXL will display status events for Battery Equalize, Battery Self-Test and Battery Commissioning when those options are active.
4
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)
• Adjustment output voltage before performing a manual load transfer.
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.
Operation
Figure 2 Main component locations
EXTERNAL
INTERFACE
BOARD
(CB2)
5
(CB1)
Figure 3 Main Display Screen, typical
Mimic
Display
Active
Event
Window
Operation
Multipurpose
Display
Menu
Bar
Figure 4 Mimic display
BYPASS
Bypass
Input
UPS
Input
Power
Battery
Block
ABC
L-L 0 0 0 V
Freq 0.0Hz
INPUT
ABC
L-L 0 0 0 V
I000A
Freq 0.0Hz
BATTERY 1 OF 4
Voltage Disable
Temp Disable
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.
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 battery voltage and the charge or discharge current to or from the battery. Pressing this icon switches among the connected battery strings. 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 battery charger.
Load—Displays the output line voltage, phase voltage, current, kVA, kW, power factor and fre-
quency. 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.
BIS1
CB1
BFB
T
MBD
DC BUS
Voltage 0V
Curr ent Float
CB2
MODULE OUTPUT
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
Legend
Inlet Air Temp 0°C
Load
6
Figure 5 Monitor/mimic display example: Normal power flow
Green – Normal
Orange – Marginal
Gray – Absent
Black – Unknown
Operation
Figure 6 Monitor/mimic display example: Utility fail
Green – Normal
Orange – Marginal
Gray – Absent
Black – Unknown
7
Figure 7 Monitor/mimic display example: Load on bypass, UPS On
Green – Normal
Orange – Marginal
Gray – Absent
Black – Unknown
Operation
Figure 8 Monitor/mimic display example: Load on bypass, UPS module off
Green – Normal
Orange – Marginal
Gray – Absent
Black – Unknown
8
2.2 Touchscreen Navigation
2.2.1 Main Display Screen
Several menu items can be accessed from the main display screen (see Figure 3). These menu items
are detailed in subsequent sections.
Figure 9 Menu tree
Operation
Liebert NXL Menu
Help Menu
Metering
Silence
Reset
Configurations Status Reports Startup Shutdown Transfer
Rating
Syste m Se ttings
Adjustable
Setpoints
Batte ry
Management
Event
Management
Interna l Op tio n
Setti ng s
Event Log
System Status
Manual Start
Device Control
Open Trap
Open MBD
UPS
System
UPS
Bypass
Batte ry
Management
Time Remaining
Grap h
Manual Battery
Test
Manual Battery
Equalize
Commissio ning
Batte ry C ycle
Monitoring
9
2.2.2 Configurations Menu
Rating
This menu item will display a popup showing the following parameters (see Figure 10). 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
Figure 10 Rating Parameters
Operation
10
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, French, Spanish, German, Italian, Portuguese
• Audio level—Range 1 to 10 (default: 5)
• Phase labeling—Auto, ABC, RST, XYZ, RYB, RWB, UVW, 123, L1L2L3 (default: Automatic)
• Unit Locator
• Location ID—Alphanumeric
• System Number—Alphanumeric
• Unit Number—Number (1 through 99)
• Unit Label—Alphanumeric
Figure 11 System Settings parameters
Operation
11
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
• Phase A (%)—10% to 105% (default: 95%)
• Phase B (%)—10% to 105% (default: 95%)
• Phase C (%)—10% to 105% (default: 95%)
• Delay (second)—0 to 60 (default: 5 seconds)
Manual Xfer Bypass Voltage Limits
• 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 12 Adjustable setpoints parameters
Operation
Battery Management
These battery 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:
• Equalize Voltage, Vpc - 2.30 to 2.40 (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.
12
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—Automatic, 0.5 minute to 30% of full load Operating Time
(default: automatic)
• 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, depending 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.
Figure 13 Battery Management Parameters
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)
13
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 7 for a list of alarms, fault and status messages.
Figure 14 Typical Event Management Parameters
Operation
2.2.3 Status Reports Menu
This menu accesses the events records.
• Event Log—Up to 1024 time/date stamped events are captured in the log. The oldest record will
be overwritten with a new record once the buffer reaches 1024 events.
•System Status
• Total Operating Hours—Total number hours the UPS has been operational
• Battery Operating Time—A running total of the battery discharge time for all events since
the log was last cleared
2.2.4 Startup Menu
This menu is used to start the UPS and individual devices.
Manual—This will begin the UPS startup. See 2.4 - Manual Procedures for details.
Devices
• Close Trap—This will start the Input filter, if installed
• Close MBD/BCB—If MBD is motor operated, the Close command will Enable and energize the
motor to close. If MBD is not motorized, the Close command will Enable the breaker UVR. The
MBD/BCB must be closed manually. If no MBD is selected, do not display this setting.
14
2.2.5 Shutdown Menu
This menu permits shutting down the UPS and individual devices.
Figure 15 Shutdown menu
Operation
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 battery 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.
Figure 16 UPS shutdown popup
System—Turns off inverter, rectifier and trips all battery breakers. Will shutdown 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 shutdown the
UPS, an operator must press OK.
Figure 17 System shutdown popup
15
2.2.6 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 18).
Figure 18 Transfer/retransfer commands
Operation
16
Loading...