Emerson Liebert NXL User manual

AC Power
For Business-Critical Continuity™
Liebert®NXL™
Installation Manual – 500-750, 60Hz, Three-Phase, Single-Module & Multi-Module

CONTACTING LIEBERT FOR SUPPORT
To contact Liebert Services for information or repair service in the United States, call
1-800-LIEBERT (1-800-543-2378). Liebert Services offers a complete range of start-up services, repair
services, preventive maintenance plans and service contracts.
For repair or maintenance service outside the 48 contiguous United States, contact Liebert Services,
if available in your area. For areas not covered by Emerson Network Power Liebert Services, the
authorized distributor is responsible for providing qualified, factory-authorized service.
For Liebert Services to assist you promptly, please have the following information available:
Part numbers: _________________________________________________________________
Serial numbers:________________________________________________________________
Rating: _______________________________________________________________________
Date purchased: _______________________________________________________________
Date installed:_________________________________________________________________
Location: ______________________________________________________________________
Input voltage/frequency:________________________________________________________
Output voltage/frequency: ______________________________________________________
Battery reserve time:___________________________________________________________
Product Warranty Registration
To register for warranty protection, visit the Service and Support section of our Web site at:
www.liebert.com
Click on Product Registration and fill out the form.

i
TABLE OF CONTENTS
IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.0 MECHANICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Environmental Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3.1 UPS Room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3.2 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4.1 Moving the Cabinets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4.2 Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4.3 Floor Installation/Anchoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 System Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.6 Cable Entry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.0 UPS ELECTRICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.1 External Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Power Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2.1 Power Cable Connection Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Control Cable and Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3.1 Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3.2 Analog Load Bus Synch Connection to Non-Liebert NXL Equipment . . . . . . . . . . . . . . . . . . 11
2.3.3 Multi-Module Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.3.4 Remote Input Breaker (RIB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3.5 Inverter Output Breaker (IOB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.4 Digital LBS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.5 Configuring Neutral and Ground Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.5.1 Four-Wire Input connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.5.2 Three-Wire Input connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.5.3 Preferred Grounding Configuration, Battery Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.5.4 Multi-Module Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.0 OPTIONAL EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3.1 Single-Module System Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.1.1 Matching Maintenance Bypass Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.1.2 Battery Temperature Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.1.3 Matching Liebert NXL Battery Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.1.4 Matching Module Battery Disconnect—MBD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.1.5 Load Bus Synch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.1.6 Remote Alarm Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.2 Communication and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.2.1 Alber Monitoring System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.0 INSTALLATION DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
5.0 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

ii
FIGURES
Figure 1 Cabinet arrangement—Liebert NXL, battery cabinets, maintenance bypass cabinet . . . . . . . . . . 5
Figure 2 Cabinet grounding plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3 Kick plate and filter locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4 Low-voltage cable installation—top entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5 External Interface Board connections layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 6 Inter-Module Communication Board wiring diagram—Multi-modules . . . . . . . . . . . . . . . . . . . . 14
Figure 7 Remote Input Breaker diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 8 Remote Output Breaker diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 9 Inter-Module Communication Board wiring diagram—Digital LBS . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 10 Main components, 500kVA Liebert NXL 1+N multi-module or SMS with static bypass. . . . . . . 21
Figure 11 Outline drawing, Liebert NXL 500kVA UPS 1+N multi-module or SMS with static bypass . . . 22
Figure 12 Output terminal details, Pg. 1, Liebert NXL 500kVA UPS 1+N multi-module or SMS with
static bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 13 Output terminal details, Pg. 2, Liebert NXL 500kVA UPS 1+N multi-module or SMS with
static bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 14 Base drawing, Liebert NXL 500kVA UPS 1+N multi-module or SMS with static bypass . . . . . . 25
Figure 15 Main components, 750kVA Liebert NXL UPS without static bypass . . . . . . . . . . . . . . . . . . . . . . 26
Figure 16 Main components, 750kVA Liebert NXL UPS with static bypass (SMS OR 1+N) . . . . . . . . . . . . 27
Figure 17 Outline drawing, 750kVA Liebert NXL without static bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 18 Outline Drawing, 750kVA Liebert NXL 1+N multi-module or SMS with static bypass . . . . . . . 29
Figure 19 Base detail drawing, 750kVA Liebert NXL, N+1 multi-module without static bypass . . . . . . . . 30
Figure 20 Base Drawing, 750kVA Liebert NXL 1+N multi-module or SMS with static bypass. . . . . . . . . . 31
Figure 21 Input/output terminal detail, 750kVA Liebert NXL without static bypass. . . . . . . . . . . . . . . . . . 32
Figure 22 Detail 750kVA Liebert NXL with static bypass (SMS/1+N). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 23 Input/output terminal detail, 750kVA Liebert NXL without static bypass (continued). . . . . . . . 34
Figure 24 Input/output terminal detail, 750kVA Liebert NXL with static bypass (SMS or
1+N) continued . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 25 Shipping split 750kVA Liebert NXL without static bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 26 Shipping Split, 750kVA Liebert NXL with static bypass (SMS/1+N) . . . . . . . . . . . . . . . . . . . . . . 37
Figure 27 Shipping Split, 750kVA Liebert NXL with static bypass (SMS/1+N) continued. . . . . . . . . . . . . . 38
Figure 28 Single-input wire cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 29 Control cable layout, UPS active analog load bus sync, 250-750kVA units . . . . . . . . . . . . . . . . . 40
Figure 30 Control cable layout, UPS passive analog load bus sync, 250-750kVA units . . . . . . . . . . . . . . . . 40
Figure 31 Control cable layout, UPS analog load bus sync, ELBS, 250-750kVA units . . . . . . . . . . . . . . . . . 41

iii
TABLES
Table 1 UPS input dry contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 2 UPS control contacts with battery cabinet or module battery disconnect . . . . . . . . . . . . . . . . . . . 10
Table 3 UPS control contacts with maintenance bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 4 UPS control contacts to remote status panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 5 UPS control contacts with analog LBS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 6 Parallel from UPS module Inter-Module Communication Board to other Inter-Module
Communication Board in system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 7 RIB UV coil, aux. contacts from UPS RIB CB interface board to remote CB1 . . . . . . . . . . . . . . . 15
Table 8 Remote IOB contacts from remote breaker to UPS IOB CB interface board . . . . . . . . . . . . . . . . 17
Table 9 Wire size, length for digital LBS connection of UPS Inter-Module Communication
Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 10 Liebert NXL UPS specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 11 Current ratings—rectifier input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 12 Current ratings—bypass input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 13 Current ratings—output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 14 Current ratings—battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Table 15 Recommended conduit and cable sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Table 16 Recommended lug sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Table 17 Recommended torque values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

iv

1
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions that should be followed during installation of your
Liebert NXL™UPS. 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 per-
sonnel.
!
WARNING
Risk of electrical shock. Can cause personal injury or death.
This UPS has several circuits that are energized with high DC as well as AC voltages. Check
for voltage with both AC and DC voltmeters before working within the UPS. Check for voltage
with both AC and DC voltmeters before making contact.
Only properly trained and qualified personnel wearing appropriate safety headgear, gloves,
shoes and glasses should be involved in installing the UPS or preparing the UPS for
installation. When performing maintenance with any part of the equipment under power,
service personnel and test equipment should be standing on rubber mats.
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 installation and maintenance.
Special safety precautions are required for procedures involving handling, installation and
maintenance of the UPS system. Observe all safety precautions in this manual before
handling or installing the UPS system. Observe all precautions in the Operation and
Maintenance Manual, SL-25425, before as well as during performance of all maintenance
procedures. Observe all DC safety precautions before working on or near the DC system.
!
WARNING
Risk of heavy unit falling over. Improper handling can cause equipment damage, injury or
death.
Exercise extreme care when handling UPS cabinets to avoid equipment damage or injury to
personnel. The UPS module weight is up to 13,200lb (5988kg).
Locate center of gravity symbols and determine unit weight before handling each
cabinet. Test lift and balance the cabinets before transporting. Maintain minimum tilt from
vertical at all times.
Slots at the base of the module cabinets are intended for forklift use. Base slots will support
the unit only if the forks are completely beneath the unit.
Read all of the following instructions before attempting to move, lift, or remove packaging
from unit, or prepare unit for installation.
!
WARNING
Risk of electrical shock and fire. Can cause equipment damage, personal injury or 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.
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 potential electric
charges may exist at the capacitor banks and at the DC connections.
All wiring must be installed by a properly trained and qualified electrician. All power and
control wiring must comply with all applicable national, state and local codes.
One person should never work alone, even if all power is disconnected from the equipment. A
second person should be standing by to assist and to summon help in case of an accident.

2
NOTICE
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. Operation of this unit in a residential area may cause
harmful interference that the user must correct at his own expense.
NOTE
Materials sold hereunder cannot be used in the patient vicinity (e.g., use where UL, cUL or
IEC 60601-1 is required). Medical applications such as invasive procedures and electrical life
support equipment are subject to additional terms and conditions.

Mechanical Installation
3
1.0 MECHANICAL INSTALLATION
1.1 Introduction
This section describes the requirements that must be taken into account when planning the position-
ing and cabling of the Liebert NXL uninterruptible power supply and related equipment.
This chapter is a guide to general procedures and practices that should be observed by the installing
personnel. The particular conditions of each site will determine the applicability of such procedures.
NOTICE
Three-phase input supply required.
The standard Liebert NXL UPS is suitable for connection to three-phase, four-wire (+ Earth)
TN-C, TN-S, IT-G or IT-IG, or three-phase, three-wire plus ground IT-UG.
If the unit is used with an IT power system, a 4-pole disconnect device must be included as
part of building installation.
NOTICE
Do not apply electrical power to the UPS equipment before the arrival of the commissioning
engineer.
1.2 Preliminary Checks
Before installing the UPS, please carry out the following preliminary checks:
• Visually examine the UPS equipment for transit damage, both internally and externally. Report
any damage to the shipper immediately.
• Verify that the correct equipment is being installed. The equipment supplied has an identification
tag on the interior doors reporting the type, size and main calibration parameters of the UPS.
• Verify that the UPS room satisfies the environmental conditions stipulated in the equipment
specification, paying particular attention to the ambient temperature and air exchange system.
1.3 Environmental Considerations
1.3.1 UPS Room
The UPS module is intended for indoor installation and should be located in a cool, dry, clean-air envi-
ronment with adequate ventilation to keep the ambient temperature within the specified operating
range (see Environmental Parameters in Table 10).
The Liebert NXL UPS is cooled with the aid of internal fans. To permit air to enter and exit and pre-
vent overheating or malfunctioning, do not cover the ventilation openings.
The Liebert NXL UPS is equipped with air filters located behind the front doors and kick plates. A
schedule for inspection of the air filters is required. The period between inspections will depend upon
environmental conditions.
When bottom entry is used, the conduit plate must be installed.
!
WARNING
Risk of electrical shock. Can cause injury or death.
Special care must be taken when working with the batteries associated with this equipment.
When they are connected together, the battery terminal voltage will exceed 400VDC and is
potentially lethal.
NOTE
All equipment not referred to in this manual is shipped with details of its own mechanical and
electrical installation.
NOTE
The UPS is suitable for mounting on concrete or other non-combustible surface only.

Mechanical Installation
4
1.3.2 Storage
Should the equipment not be installed immediately, it must be stored in a room for protection against
excessive humidity and/or heat sources (see Environmental Parameters in Table 10).
1.4 Positioning
The cabinet is structurally designed to handle lifting from the base.
Access to the power terminals, auxiliary terminal blocks and power switches is from the front.
The door can be opened to give access to the power connection bars, auxiliary terminal blocks and
power isolators. Front door can be opened at 180 degrees, and interior doors can be removed for more
flexibility in installations.
1.4.1 Moving the Cabinets
The route to be travelled between the point of arrival and the unit’s position must be planned to make
sure that all passages are wide enough for the unit and that floors are capable of supporting its
weight (for instance, check that doorways, lifts, ramps, etc. are adequate and that there are no
impassable corners or changes in the level of corridors).
Ensure that the UPS weight is within the designated surface weight loading (kg/cm2) of any handling
equipment. For weight details, see Table 10.
The UPS can be handled with a forklift or similar equipment. Ensure any lifting equipment used in
moving the UPS cabinet has sufficient lifting capacity. When moving the unit by forklift, care must be
taken to protect the panels. Do not exceed a 15-degree tilt with the forklift. Bottom structure will sup-
port the unit only if the forks are completely beneath the unit.
Handling with straps is not authorized.
1.4.2 Clearances
The Liebert NXL has no ventilation grilles at either side or at the rear of the UPS. Clearance around
the front of the equipment should be sufficient to enable free passage of personnel with the doors fully
opened. It is important to leave a distance of 24in (610mm) between the top of the UPS and any over-
head obstacles to permit adequate circulation of air coming out of the unit.
1.4.3 Floor Installation/Anchoring
If the equipment is to be located on a raised floor, it should be mounted on a pedestal suitably
designed to accept the equipment point loading. Refer to the base view to design this pedestal. Kick
plates must be installed. If the unit is to be installed in a position that permits access to rear kick
plates, then kick plates must be installed before the unit is placed in its final position.
NOTE
The UPS must be placed a solid floor. There must be no openings in floor except those required
for conduit landing areas. All provided kick plates must be installed.
!
WARNING
Risk of heavy unit falling over. Improper handling can cause equipment damage, injury or
death.
Because the weight distribution in the cabinet is uneven, use extreme care while handling
and transporting. Take extreme care when handling UPS cabinets to avoid equipment
damage or injury to personnel.
The UPS module weight is up to 13,200lb (5988kg).
Locate center of gravity symbols and determine unit weight before handling each
cabinet. Test lift and balance the cabinets before transporting. Maintain minimum tilt from
vertical at all times.

Mechanical Installation
5
1.5 System Composition
A UPS system can comprise a number of equipment cabinets, depending on the individual system
design requirements: e.g., UPS cabinet, battery cabinet, maintenance bypass cabinet. In general, all
the cabinets used in a particular installation are of the same height. Refer to the drawings provided in
4.0 - Installation Drawings for the positioning of the cabinets as shown in Figure 1.
1.6 Cable Entry
Cables can enter the UPS cabinet from bottom or top into the Input/Output (I/O) section of the unit;
see the figures in 4.0 - Installation Drawings.
Figure 1 Cabinet arrangement—Liebert NXL, battery cabinets, maintenance bypass cabinet
Note: If a maintenance bypass
cabinet is used, it must be
installed on the right side of
the Liebert NXL UPS
Liebert
NXL
UPS
Liebert
NXL
UPS
Maintenance
Bypass
Cabinet
Battery
Cabinet
Liebert
NXL
UPS
Maintenance
Bypass
Cabinet
Additional
Battery
Cabinet(s)
Battery
Cabinet
Liebert
NXL
UPS
Additional
Battery
Cabinet(s)
Battery
Cabinet
Liebert
NXL
UPS
Additional
Battery
Cabinet(s)
If the cabinets are to be bolted
together, the side panels and
hangers must be removed before
beginning.
Note: Battery cabinets can be
bolted to the right of the UPS.
However, the cabling must be
routed externally.

UPS Electrical Installation
6
2.0 UPS ELECTRICAL INSTALLATION
This chapter provides guidelines for qualified installers who must have knowledge of local wiring
practices pertaining to the equipment to be installed.
2.1 External Protective Devices
For safety, it is necessary to install circuit breakers in the input AC supply and external battery sys-
tem. Given that every installation has its own characteristics, this section provides guidelines for
qualified installation personnel with knowledge of operating practices, regulatory standards and the
equipment to be installed.
External overcurrent protection must be provided. See Table 10 - Liebert NXL UPS specifications
for overload capacity.
2.2 Power Cables
The UPS requires both power and control cabling. All control cables, whether shielded or not, should
be run separately from the power cables in metal conduits or metal ducts that are electrically bonded
to the metalwork of the cabinets to which they are connected.
The cable design must comply with the voltages and currents in Tables 11 through 14, follow local
wiring practices and take into consideration the environmental conditions (temperature and physical
support media), room temperature and conditions of installation of the cable and system’s overload
capacity (see 5.0 - Specifications).
When sizing battery cables, a maximum volt drop of 2VDC is permissible at the current ratings given
in Table 14.
The following are guidelines only and are superseded by local regulations and codes of practice where
applicable:
• Take special care when determining the size of the neutral cable (grounded conductor), because
current circulating on the neutral cable may be greater than nominal current in the case of non-
linear loads. Refer to the values in Table 10.
• The grounding conductor should be sized according to the fault rating, cable lengths, type of pro-
tection, etc. The grounding cable connecting the UPS to the main ground system must follow the
most direct route possible.
• Consideration should be given to the use of paralleled smaller cables for heavy currents, as this
can ease installation considerably.
• AC and DC cables must be run in conduits according to local codes, national codes and standard
best practices. This will prevent creation of excess EMI fields.
!
WARNING
Risk of electrical shock. Can cause injury or death.
The UPS contains high DC as well as AC voltages. Check for voltage with both AC and DC
voltmeters before working within the UPS.
Only properly trained and qualified personnel wearing appropriate safety headgear, gloves,
shoes and glasses should be involved in installing the UPS or preparing the UPS for
installation.
!
WARNING
Risk of electrical shock. Can cause injury or death.
Before cabling the UPS, ensure that you are aware of the location and operation of the
external isolators that connect the UPS input/bypass supply to the power distribution panel.
Check that these supplies are electrically isolated, and post any necessary warning signs to
prevent their inadvertent operation.

UPS Electrical Installation
7
2.2.1 Power Cable Connection Procedure
The rectifier input, bypass, output and battery power cables (all require lug-type terminations) are
connected to busbars in the I/O sections (refer to 4.0 - Installation Drawings).
Equipment Ground
The equipment ground busbar is in the I/O sections as shown in (refer to 4.0 - Installation Draw-
ings). The grounding conductor must be connected to the ground busbar and bonded to each cabinet
in the system.
All cabinets and cabling should be grounded in accordance with local regulations.
Once the equipment has been positioned and secured, connect the power cables as described below
(refer to the appropriate cable connection drawing in 4.0 - Installation Drawings):
1. Verify that the UPS equipment is isolated from its external power source and all the UPS power
isolators are open. Check that these supplies are electrically isolated and post any necessary
warning signs to prevent their inadvertent operation.
2. Open exterior and interior panels on the front of the I/O sections.
3. Connect the ground and any necessary main bonding jumper to the equipment ground busbar
located in the I/O sections.
4. Make power connections and tighten the connections to the proper torque.
Ensure correct phase rotation.
5. For control connection details, see 2.3 - Control Cable and Communication.
6. Close and secure the interior and exterior doors.
7. Attach the cabinet grounding plates to the top of the UPS at each shipping split. See Figure 2.
8. Attach the kick plates and filters to the bottom of the unit. See Figure 3.
NOTE
Proper grounding reduces problems in systems caused by electromagnetic interference.
!
WARNING
Failure to follow adequate grounding procedures can result in electric shock hazard to
personnel, or the risk of fire, should a ground fault occur.
All operations described in this section must be performed by properly trained and qualified
electricians or technical personnel. If any difficulties are encountered, contact Emerson
Network Power. See the back page of this manual for contact information.
The grounding and neutral bonding arrangement must be in accordance with local and
national codes of practice.
!
WARNING
Risk of electrical shock. Can cause injury or death.
If the load equipment will not be ready to accept power on the arrival of the commissioning
engineer, ensure that the system output cables are safely isolated at their termination.
!
WARNING
Risk of electrical shock. Can cause injury or death.
When connecting the cables between the battery extremities to the circuit breaker, always
connect the circuit breaker end of the cable first.
NOTE
If fault bracing brackets were removed during installation, they MUST be replaced.

UPS Electrical Installation
8
Figure 2 Cabinet grounding plates
Figure 3 Kick plate and filter locations
Figure 4 Low-voltage cable installation—top entry
NOTE
Kick plates must be installed. If the unit is to be installed in a position that permits access to
rear kick plates, then kick plates must be installed before the unit is placed in its final position.
Note location
of larger cutouts.
Orient ground plate
as shown.
A
Mounting
Hardware
(Supplied)
Installed at Each Shipping Split
Detail A
INSTALL M6X25 BOLT,
LCKW AND WSHR
(4) PLACES, FRONT SIDE
INSTALL M6X25 BOLT,
LCKW AND WSHR
(2) PLACES, EACH SIDE
FRONT
KICKPLATE
KICKPLATE
REAR
KICKPLATE
KICKPLATE
INSTALL M6X25 BOLT,
LCKW AND WSHR
(4) PLACES, REAR SIDE
INSTALL M6X60 BOLT,
LCKW AND WSHR
(2) PLACES, FRONT SIDE
D
DETAIL D
E
DETAIL E
G
DETAIL G
F
Low-voltage cables can be install through the top of each unit. The entry conduit landing plate is shipped inverted.
To install, remove conduit plate, flip and reinstall. Removal of side plate is for access to pull wires.
REMOVE PLATES FLIP PLATES INSTALL

UPS Electrical Installation
9
2.3 Control Cable and Communication
Based on your site’s specific needs, the UPS may require auxiliary connections to manage the battery
system (external battery circuit breaker), communicate with a personal computer or provide alarm
signaling to external devices, or for Remote Emergency Power Off (REPO). The External Interface
Board, arranged for this purpose, is next to the option box in the Rectifier section (refer to 4.0 -
Installation Drawings).
Figure 5 External Interface Board connections layout
P66C P99C
TB0823
EPO
STATUS
TB0829
EXTERNA L
CAN
TB1154B TB1154 A
TB0825
TB0824
TB0826
TB0820 TB0818
TB0817
TB0819
TB0816
TB0830
TB035TB0821
P0801
TB0811
TB0810
TB0813
TB0812
TB0815
P0832
P0831
P0808
OPT
PS
INT BATT
CAN
EXT BATT
CAN
REPO
J4
REPO
FORM C
LBS VO LTAGE
EXTERNA L
CAN MOB
MIB
RIB
MBB
BIB
KEY
STATUS
INV
CNTRLN
RECT
CNTL
BYP CNTL
ON GEN
ACT FILT
STATUS
BATT GND
FLT
ACT FILT
CNTL
MAINT BYP
ENABLE
AUX SPARE
TEMP
J5
BATT MTR
OP TB1156

UPS Electrical Installation
10
2.3.1 Dry Contacts
NOTE
If connection to more than one module is required, use a separate contact for each module.
Table 1 UPS input dry contacts
Item
Terminal
Block Pin
Connects to
(Description of External Item)
Wire Size/
Max Length
Remote EPO
Input Form C TB0824
1 REPO Switch, normally open contact
14AWG/
500ft.
2 REPO Switch, common contact
3REPO Switch, normally closed contact, set jumper
J5: 1-2 to enable, 2-3 to disable
On Generator
Input Form C TB0816
1 On Generator switch, closed = On Generator
2 On Generator switch, common
3On Generator switch,
closed = Not On Generator
Table 2 UPS control contacts with battery cabinet or module battery disconnect
Item
Terminal
Block Pin
Connects to
(Description of External Item)
Wire Size/
Max Length
CAN Bus and
24V Power
Supply
TB1154A
1 Battery Interface Board TB1154-1
18 AWG
1000ft.
2 Battery Interface Board TB1154-2
3 Battery Interface Board TB1154-3
4 Battery Interface Board TB1154-4
Table 3 UPS control contacts with maintenance bypass
Item
Terminal
Block Pin
Connects to
(Description of External Item)
Wire Size/
Max Length
Maintenance
Isolation Breaker
(MIB) Form C 1TB0811
1 CB aux. contact, closed = CB is closed 14AWG/500ft.
(152m)
2 CB aux. contact, common
3 CB aux. contact, closed = CB is open
Maintenance Bypass
Breaker (MBB) Form C 1TB0813
1 CB aux. contact, closed = CB is closed 14AWG/500ft.
(152m)
2 CB aux. contact, common
3 CB aux. contact, closed = CB is open
Maintenance Bypass
Enable Form C 1TB0821
1Maintenance Bypass Cabinet,
closed = load not on inverter 14AWG/500ft.
(152m)
2 Maintenance Bypass Cabinet, common
3Maintenance Bypass Cabinet,
closed = load on inverter
Remote EPO Input 1TB0825 1 REPO Switch, normally open contact 14AWG/500ft.
(152m)
2 REPO Switch, common contact
Key Status Input Form C 1TB0820
1 Key status switch, closed = key removed 14AWG/500ft.
(152m)
2 Key status switch, common
3 Key status switch, closed = key inserted
Module Output Breaker
(MIB) Form C 2TB0815
1 CB aux. contact, closed = CB is closed 14AWG/500ft.
(152m)
2 CB aux. contact, common
3 CB aux. contact, closed = CB is open
Rectifier Input Breaker
(RIB) Form C TB0810
1 CB aux. contact, closed = CB is closed 14AWG/500ft.
(152m)
2 CB aux. contact, common
3 CB aux. contact, closed = CB is open
Bypass Input Breaker
(BIB) Form C TB0812
1 CB aux. contact, closed = CB is closed
14AWG/500ft.
(152m)
2 CB aux. contact, common
3CB or Switch aux. contact,
closed = CB or switch is open
1. For 1+N systems with a maintenance Bypass, these Aux contacts must be run to each module from an isolated source.
2. For 1+N systems, these breaker Aux contact go to the UPS that it is associated with.

UPS Electrical Installation
11
2.3.2 Analog Load Bus Synch Connection to Non-Liebert NXL Equipment
Refer to Figures 29 through 31 for layouts.
Table 4 UPS control contacts to remote status panel
Item
Terminal
Block Pin
Connects to
(Description of External Item)
Wire Size/
Max Length
CAN Bus and 24V
Power Supply TB0829
1 Remote Status Panel TB-2
18 AWG/1000ft.
(304m)
2 Remote Status Panel TB-1
3 Remote Status Panel TB-3
4 Remote Status Panel TB-4
Table 5 UPS control contacts with analog LBS
Terminal Designation
Signal Name Wire Range/Max LengthFrom To
ANALOG LBS SIGNALS FROM UPS POWER BUS BARS TO LBS TRANSFORMER BOX
V-OUT-A F72 CRITICAL BUS VOLTS PH A
#14-22AWG/500FtV-OUT-B F73 CRITICAL BUS VOLTS PH B
V-OUT-C F74 CRITICAL BUS VOLTS PH C
V-BYP-A F69 BYPASS VOLTS PH A
#14-22AWG/500FtV-BYP-B F70 BYPASS VOLTS PH B
V-BYP-C F71 BYPASS VOLTS PH C
ANALOG LBS SIGNALS FROM UPS LBS INTERFACE BOARD TO LBS TRANSFORMER BOX
TB0826-1 TB27-7 SYNCH PH A
#14-22AWG/500FtTB0826-3 TB27-8 SYNCH PH B
TB0826-5 TB27-9 SYNCH PH C
ANALOG LBS SIGNALS FROM UPS LBS TRANSFORMER BOX ASSEMBLY TO LBS BOX - SYSTEM #1
TB27-7 TB4-4 SYNCH PH A
#14-22AWG/500Ft
TB27-8 TB4-5 SYNCH PH B
TB27-9 TB4-6 SYNCH PH C
TB27-4 TB3-1 CRITICAL BUS VOLTS PH A
TB27-5 TB3-2 CRITICAL BUS VOLTS PH B
TB27-6 TB3-3 CRITICAL BUS VOLTS PH C
TB27-1 TB2-2 BYPASS VOLTS PH A (V&I BOARD IN LBS BOX)
TB27-2 TB2-5 BYPASS VOLTS PH B (V&I BOARD IN LBS BOX)
TB27-3 TB2-9 BYPASS VOLTS PH C (V&I BOARD IN LBS BOX)
TB27-11 TB1-1 LBS POWER SUPPLY
TB27-12 TB1-2 LBS POWER SUPPLY
ANALOG LBS SIGNALS FROM UPS INTER-MODULE COMMUNICATION BOARD TO LBS BOX - SYSTEM #1
P3105-3 TB1-1 SYNCH TO MASTER (LBS BOARD IN LBS BOX) #18AWG/500Ft
P3105-4 TB1-2 SYNCH TO MASTER RETURN (LBS BOARD IN LBS BOX)
P3107-2 TB5-5 SYSTEM ON BYPASS (N.C.) RETURN (V&I BOARD IN
LBS BOX) #14-22AWG/500Ft
P3107-1 TB5-4 SYSTEM ON BYPASS (N.C.) (V&I BOARD IN LBS BOX)
P3107-6 TB1-7 TRANSFERRED TO BYPASS (LBS BOARD IN LBS BOX) -
FOR ACTIVE LBS OPTION #14-22AWG/500Ft
P3107-5 TB1-8 TRANSFERRED TO BYPASS RETURN (LBS BOARD IN
LBS BOX) - FOR ACTIVE LBS OPTION

UPS Electrical Installation
12
Analog LBS Signals from UPS LBS Transformer Box Assembly to LBS Box - System #2
TB27-7 TB3-4 SYNCH PH A
#14-22AWG/500Ft
TB27-8 TB3-5 SYNCH PH B
TB27-9 TB3-6 SYNCH PH C
TB27-4 TB4-1 CRITICAL BUS VOLTS PH A
TB27-5 TB4-2 CRITICAL BUS VOLTS PH B
TB27-6 TB4-3 CRITICAL BUS VOLTS PH C
TB27-1 TB3-1 BYPASS VOLTS PH A (V&I BOARD IN LBS BOX)
TB27-2 TB3-5 BYPASS VOLTS PH B (V&I BOARD IN LBS BOX)
TB27-3 TB3-10 BYPASS VOLTS PH C (V&I BOARD IN LBS BOX)
TB27-11 TB2-1 LBS POWER SUPPLY
TB27-12 TB2-2 LBS POWER SUPPLY
Analog LBS Signals from UPS Inter-Module Communication Board to LBS Box - System #2
P3105-3 TB2-1 SYNCH TO MASTER (LBS BOARD IN LBS BOX) #18AWG/500Ft
P3105-4 TB2-2 SYNCH TO MASTER RETURN (LBS BOARD IN LBS BOX)
P3107-2 TB5-2 SYSTEM ON BYPASS (N.C.) RETURN (V&I BOARD IN
LBS BOX) #14-22AWG/500Ft
P3107-1 TB5-1 SYSTEM ON BYPASS (N.C.) (V&I BOARD IN LBS BOX)
P3107-6 TB2-7 TRANSFERRED TO BYPASS (LBS BOARD IN LBS BOX) -
FOR ACTIVE LBS OPTION #14-22AWG/500Ft
P3107-5 TB2-8 TRANSFERRED TO BYPASS RETURN (LBS BOARD IN
LBS BOX) - FOR ACTIVE LBS OPTION
Analog LBS Signals from UPS LBS Transformer Box Assembly to ELBS BOX
TB27-7 TB4-4 SYNCH PH A
#14-22AWG/500Ft
TB27-8 TB4-5 SYNCH PH B
TB27-9 TB4-6 SYNCH PH C
TB27-4 TB3-4 CRITICAL BUS VOLTS PH A
TB27-5 TB3-5 CRITICAL BUS VOLTS PH B
TB27-6 TB3-6 CRITICAL BUS VOLTS PH C
TB27-1 TB2-2 BYPASS VOLTS PH A
TB27-2 TB2-5 BYPASS VOLTS PH B
TB27-3 TB2-9 BYPASS VOLTS PH C
TB27-11 TB1-1 LBS POWER SUPPLY
TB27-12 TB1-2 LBS POWER SUPPLY
Analog LBS Signals from UPS/SCC Inter-Module Communication Board to ELBS Box
P3105-3 TB1-1 SYNCH TO MASTER (LBS BOARD IN LBS BOX) #18AWG/500Ft
P3105-4 TB1-2 SYNCH TO MASTER RETURN (LBS BOARD IN LBS BOX)
P3107-2 TB5-5 SYSTEM ON BYPASS (N.C.) RETURN (V&I BOARD IN
LBS BOX) #14-22AWG/500Ft
P3107-1 TB5-4 SYSTEM ON BYPASS (N.C.) (V&I BOARD IN LBS BOX)
Table 5 UPS control contacts with analog LBS (continued)
Terminal Designation
Signal Name Wire Range/Max LengthFrom To

UPS Electrical Installation
13
2.3.3 Multi-Module Communication
Paralleling cables that connect the module to the system are connected to terminals P3101 and P3103
on the Inter-Module Communication (IMC) board (refer to 4.0 - Installation Drawings).
Table 6 Parallel from UPS module Inter-Module Communication Board to other Inter-Module
Communication Board in system
Terminal Designation
Signal Name
Wire Size/
Max LengthFrom To
Primary Connections
P3101-1 P3101-1 Share CAN +24V
#18AWG/
1000ft
P3101-2 P3101-2 Share CAN common
P3101-3 P3101-3 System CAN +24V
P3101-4 P3101-4 System CAN common
P3101-5 P3101-5 SER synch CAN+24V
P3101-6 P3101-6 SER synch CAN common
P3101-7 P3101-7 Ground
P3101-14 P3101-14 Ground
P3101-8 P3101-8 PWM synch CAN +24V
P3101-9 P3101-9 PWM synch CAN common
P3101-10 P3101-10 MMS synch CAN +24V
P3101-11 P3101-11 MMS synch CAN common
P3101-12 P3101-12 LBS synch CAN +24V
P3101-13 P3101-13 LBS synch CAN common
Redundant Connections
P3103-1 P3103-1 Redundant share CAN +24V
#18AWG/
1000ft
P3103-2 P3103-2 Redundant share CAN common
P3103-3 P3103-3 Redundant system CAN +24V
P3103-4 P3103-4 Redundant system CAN common
P3103-5 P3103-5 Redundant SER synch CAN +24V
P3103-6 P3103-6 Redundant SER synch CAN common
P3103-7 P3103-7 Ground
P3103-14 P3103-14 Ground
P3103-8 P3103-8 Redundant PWM synch CAN +24V
P3103-9 P3103-9 Redundant PWM synch CAN common
P3103-10 P3103-10 Redundant MMS synch CAN +24V
P3103-11 P3103-11 Redundant MMS synch CAN common
P3103-12 P3103-12 Redundant LBS synch CAN +24V
P3103-13 P3103-13 Redundant LBS synch CAN common
1. Must only use Belden 8106 or Belden 8102.
2. Each cable group should be run in a separate grounded conduit to ensure redundancy.
3. The maximum lengths must include all the parallel cables from the first module to the last module. The primary and redundant
cable lengths can be counted separately. The ground pins on the Inter-Module Communication Board (pins 7 and 14) are
connected together on the board. If using cable with only one (1) drain wire, then connect to the ground to pin 7.
4. If using (4) Belden 8102 cables, all (4) cables must be run in the same conduit.

UPS Electrical Installation
14
Figure 6 Inter-Module Communication Board wiring diagram—Multi-modules
2.3.4 Remote Input Breaker (RIB)
For systems that use Remote Input Breakers (RIB), the controls for the Aux contacts, UVR, Motor
Operator (optional) and voltage sense will go between the Remote breaker and the UPS Input I/O sec-
tion. See Figure 7.
Figure 7 Remote Input Breaker diagram
UPS 1 UPS 2
UPS 3
P3103
P3101
P3103
P3101
P3103
P3101
IMC
02-806730-xx IMC
02-806730-xx
IMC
02-806730-xx
A
B
C
E
RIB
10A 10A 10A
IN_LINE_A
IN_LINE_B
IN_LINE_C
INPUT EMI
FILTER
IN_LOAD_A
IN_LOAD_B
IN_LOAD_C
A
B
C
A
B
C
LINE LOAD
V_IN_R_A
V_IN_R_B
V_IN_R_C
4 CB1_COIL_RTN
3_CB1_NO (CB CLOSED)
2_CB1_NC (CB OPEN )
5CB1_COIL
1_CB1_COM
Inside UPS Cabinet
RIB
UVR Coil
(48VDC)
RIB Status
Contacts
120-240VAC
Close
RIB
RCB1
Electrical
Operator
120-240 Vac
(suppli ed by
switchgear vendor )
5_MTR_OP_CLOSE
2_MTR_OP_ENABLE
Circuit Breaker
Interface
Board
02-806711 -01
Inside Switchgear
To Customer
Input
Terminals
12 12 12
RIB-1
1
1
Fuses should be 10A class CC or J type time delay
fuse
2
Electrical operator power provided by switchgear
vendor and shall be powered from line side of RIB
TB1
TB1-1
TB1-2
TB1-3
2
TB1101
TB1102