Vertiv Liebert NXL User manual

Liebert®
NXL™ UPS
Installation Manual — 250-400kVA, 60Hz, Three-Phase, Single-Module and
Multi-Module Units

Technical Support Site
If you encounter any installation or operational issues with your product, check the pertinent
section of this manual to see if the issue can be resolved by following outlined procedures.
Visit https://www.VertivCo.com/en-us/support/ for additional assistance.
The information contained in this document is subject to change
without notice and may not be suitable for all applications. While
every precaution has been taken to ensure the accuracy and
completeness of this document, Vertiv assumes no responsibility
and disclaims all liability for damages resulting from use of this
information or for any errors or omissions. Refer to other local
practices or building codes as applicable for the correct methods,
tools, and materials to be used in performing procedures not
specifically described in this document.
The products covered by this instruction manual are manufactured
and/or sold by Vertiv This document is the property of Vertiv and
contains confidential and proprietary information owned by Vertiv.
Any copying, use or disclosure of it without the written permission of
Vertiv is strictly prohibited.
Names of companies and products are trademarks or registered
trademarks of the respective companies. Any questions regarding
usage of trademark names should be directed to the original
manufacturer.

i
TABLE OF CONTENTS
CONTACTING VERTIV FOR SUPPORT . . . . . . . . . . . . . . . . . . . . . . . . . . . INSIDE FRONT COVER
IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.0 SINGLE-MODULE AND MULTI-MODULE MECHANICAL INSTALLATION. . . . . . . . . . . . 3
1.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Environmental Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.1 UPS Room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.2 Storing the UPS and Batteries for Delayed Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.4 Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4.1 Moving the Cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.2 Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.3 Raised Floor Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.4 Kick Plate Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.5 Special Considerations for 1+N Parallel Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5 System Composition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.6 Cable Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.0 UPS ELECTRICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 External Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Power Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.1 Sizing the Input Breaker Feeding a Liebert NXL UPS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2.2 Power Cable Connection Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3 Control Cable and Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.3.1 Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.3.2 Multi-Module Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.4 Digital LBS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.5 Configuring Neutral and Ground Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
2.5.1 Four-Wire Input connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.5.2 Three-Wire Input Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.5.3 Preferred Grounding Configuration, Battery Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.5.4 Multi-Module Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.5.5 High Resistance Ground Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.6 Grounding Diagrams, Single- and Multi-Module Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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 Load Bus Synch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3.1.4 Remote Alarm Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3.2 Communication and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3.2.1 Alber®Monitoring System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3.2.2 Programmable Relay Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3.2.3 Input Contact Isolator Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

ii
4.0 INSTALLATION DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
5.0 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
FIGURES
Figure 1 Cabinet arrangement—Liebert NXL single-module, battery cabinets, maintenance
bypass
cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 2 Cabinet arrangement—Liebert NXL 400kVA, 575-600V multi-module and battery
cabinets7
Figure 3 Cabinet grounding plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 4 Kick plate and filter locations, typical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 5 External Interface Board connections layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 6 Inter-Module Communication Board wiring diagram—Multi-modules . . . . . . . . . . . . . . 15
Figure 7 Inter-Module Communication Board wiring diagram—Digital LBS. . . . . . . . . . . . . . . . . . 15
Figure 8 Grounding diagram, three-wire single-module system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 9 Grounding diagram, four-wire single-module system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 10 Grounding diagram, three-wire multi-module system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 11 Grounding diagram, four-wire multi-module system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 12 Control wiring, Programmable Relay Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 13 Programmable relay board dialog box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Figure 14 Input contact isolator dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Figure 15 Optional Input Contact Isolator Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Figure 16 Outline drawing, 250kVA, 480V Liebert NXL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Figure 17 Outline drawing, 250kVA, 575/600V; and 300kVA, 480/575/600V Liebert NXL. . . .26
Figure 18 Outline drawing, 400kVA, 480V Liebert NXL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Figure 19 Outline drawing, 400kVA, 575V/600V Liebert NXL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Figure 20 Outline drawing, 400kVA, 575V/600V Liebert NXL with DC I/O cabinet. . . . . . . . . . . .29
Figure 21 Main components, 250kVA, 480V Liebert NXL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Figure 22 Main components, 250kVA, 575/600V, and 300kVA, 480/575/600V Liebert NXL. . 31
Figure 23 Main components, 400kVA, 480V Liebert NXL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Figure 24 Main components, 400kVA, 575V/600V Liebert NXL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Figure 25 Main components, 400kVA, 575V/600V Liebert NXL with DC I/O cabinet . . . . . . . . .34
Figure 26 Input/output conduit detail drawing, 250-300kVA, all voltages, Liebert NXL . . . . . . .35
Figure 27 Input/output terminal detail, 400kVA, 480V Liebert NXL. . . . . . . . . . . . . . . . . . . . . . . . . . .36
Figure 28 Input/output terminal detail, 400kVA, 575V/600V Liebert NXL . . . . . . . . . . . . . . . . . . . . 37
Figure 29 Input/output terminal detail, 400kVA, 575V/600V Liebert NXL with DC I/O cabinet .
38
Figure 30 Top cable entry routing and installation order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Figure 31 Bottom cable entry routing and installation order. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 32 Single-input busbar arrangement—250-400kVA units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 33 Low-voltage cable entry—250-400kVA units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 34 Inverter overload data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 35 Bypass overload data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

iii
TABLES
Table 1 UPS input dry contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 2 UPS control with battery cabinet or module battery disconnect . . . . . . . . . . . . . . . . . . . . 13
Table 3 UPS control contacts with global maintenance bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 4 UPS control contacts to remote status panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Table 5 Parallel from UPS module Inter-Module Communication Board to other Inter-Module
Communication Board in system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 6 Wire size, length for digital LBS connection of UPS Inter-Module Communication
Boards15
Table 7 Programmable Relay Board pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 8 Input Contact Isolator Board pre-assigned values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Table 9 Input Contact Isolator Board control wiring connections . . . . . . . . . . . . . . . . . . . . . . . . . . .24
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 17 Recommended torque values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

iv

Important Safety Instructions
Vertiv | Liebert NXL 250-400 Installation Manual 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
personnel.
!
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 ranges from 3965 to 6380 lb. (1768 to 2894kg).
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 modules 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, remove packaging
from or preparing unit for installation.

Important Safety Instructions
Vertiv | Liebert NXL 250-400 Installation Manual 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 communication.
Operation of this unit in a residential area may cause harmful interference that the user must correct at
his own expense.
!
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.
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.

Single-Module and Multi-Module Mechanical Installation
Vertiv | Liebert NXL 250-400 Installation Manual 3
1.0 SINGLE-MODULE AND MULTI-MODULE
MECHANICAL INSTALLATION
1.1 INTRODUCTION
This following section describes the requirements that must be taken into account when
planning the positioning 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
All equipment not referred to in this manual is shipped with details of its own mechanical and electrical
installation.
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, IT-IG or, three-phase, three-wire plus ground, IT-UG.
If using with 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 back of the main door 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.
!
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 connected together, the battery terminal voltage will exceed 400VDC
and is potentially lethal.

Single-Module and Multi-Module Mechanical Installation
Vertiv | Liebert NXL 250-400 Installation Manual 4
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
environment 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
prevent overheating or malfunctioning, do not cover the ventilation openings.
The Liebert NXL UPS is equipped with air filters located behind the front doors. 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.
1.3.2 Storing the UPS and Batteries for Delayed Installation
If the Liebert NXL system will not be installed immediately, it must be stored indoors in a clean,
dry and cool location (see Environmental Parameters in Table 10). If the UPS includes batteries,
either internally or in a battery cabinet, the batteries’ requirements will dictate the storage
conditions. Batteries should be unpacked, installed and charged as soon as possible after
delivery.
NOTICE
Risk of failure to properly charge batteries. Can cause permanent damage to batteries and void the
warranty.
Batteries will self-discharge during storage. Batteries must be recharged as recommended by the battery
manufacturer.
A notice of “Charge Before Date” is affixed to each unit that has batteries inside. The “Charge Before
Date” is calculated based on the batteries being stored at 77°F (25°C). Storage at a higher temperature
will increase the rate of self-discharge, requiring earlier recharge. Consult the battery manufacturer on
how to determine when the batteries need to be recharged.
1.4 POSITIONING
The cabinet is structurally designed to handle lifting from the base.
Access to the power terminals, auxiliary terminals blocks and power switches is from the front.
The door can be opened to give access to the power connections bars, auxiliary terminal blocks
and power isolators. Front door can be opened at 180° for more flexibility in installations.
NOTE
To ensure proper airflow, the unit must be installed only on a solid surface made of a
noncombustible material, such as concrete.
NOTE
The UPS is suitable for mounting on concrete or other non-combustible surface only.
NOTE
The UPS must be placed a solid surface. There must be no openings in the surface except those
required for conduit landing areas. All provided kick plates must be installed.

Single-Module and Multi-Module Mechanical Installation
Vertiv | Liebert NXL 250-400 Installation Manual 5
1.4.1 Moving the Cabinets
The route to be traveled 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 support 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 24" (610mm) between the top of the
UPS and any overhead obstacles to permit adequate circulation of air coming out of the unit.
1.4.3 Raised Floor Installations
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.
The top of pedestal must be solid.
1.4.4 Kick Plate Installation
Kick plates must be installed. If the unit is to be installed in a position that does not permit access
to the rear kick plates, then kick plates must be installed before the unit is placed in its final
position.
!
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 ranges from 3965 to 6380 lb. (1768 to 2894kg).
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.
NOTE
The UPS must be placed on a solid surface. There must be no openings in the surface except
those required for conduit landing areas. All provided kick plates must be installed.

Single-Module and Multi-Module Mechanical Installation
Vertiv | Liebert NXL 250-400 Installation Manual 6
1.4.5 Special Considerations for 1+N Parallel Systems
Consider the grounding configuration of your system before finalizing module placement See
2.5 - Configuring Neutral and Ground Connections.
Vertiv recommends matching the impedance in the bypass path of paralleled systems as closely
as possible.
The impedance mismatch can be minimized by controlling the wiring length of each unit. The
design and the layout of the UPS system and associated panels and cabling should be examined
closely to ensure that cable lengths and impedances are closely matched. The Liebert 1+N UPS
module is supplied with a sharing reactor to minimize the impact of cable impedance mismatch.
The cabling impedance must be carefully controlled to ensure good bypass current sharing.
For Liebert NXL Systems, the cabling impedances must be within 10% from maximum to
minimum. If the cabling impedances need to be greater than 10%, contact your Vertiv
representative to calculate whether the system will result in an overload condition when
operating on bypass.
When bringing the 1+N system online for the first time or after removing one unit, Vertiv
recommends checking the bypass current mismatch. To check the bypass current mismatch:
1. Place a load on the bypass of each UPS module.
2. View the output current of each unit.
The accuracy of the currents displayed on the UPS module is sufficient for this check. If the mismatch is
greater than 10%, the bypass impedances must be balanced or the load must be limited to less than the
maximum rating.
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
Figures 1 and 2.
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.

Single-Module and Multi-Module Mechanical Installation
Vertiv | Liebert NXL 250-400 Installation Manual 7
Figure 1 Cabinet arrangement—Liebert NXL single-module, battery cabinets, maintenance bypass cabinet
Figure 2 Cabinet arrangement—Liebert NXL 400kVA, 575-600V multi-module and battery cabinets
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)
The side panels and
hangers must be removed
before the cabinets can
be bolted together.
Applicable to:
250 - 400 kVA 480V, 250 - 300 kVA
575/600V except without
Maintenance Bypass Cabinet
Liebert
NXL
UPS
I/O
Bypass
Section
DC I/O
Section
Battery
Cabinet
Battery
Cabinet
Liebert
NXL
UPS
The side panels and hangers must be
removed before the cabinets can be

UPS Electrical Installation
Vertiv | Liebert NXL 250-400 Installation Manual 8
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
system. 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.
Dual Input
When wiring the UPS with a separate rectifier and bypass input, each input must be protected
separately. Size the breakers according to the input currents shown in Table 10.
2.2 POWER CABLES
The UPS requires both power and control cabling. All control cables, whether shielded or not,
should be run separate from the power cables in metal conduits or metal ducts which 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 Table 10, 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).
For cable entry terminal, refer to Figures 26 28 and 29.
NOTICE
For dual input operation ensure that any busbars between the bypass and the rectifier input are removed.
When sizing battery cables, a maximum volt drop of 2VDC is permissible at the current ratings
given in Table 14.
!
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
Vertiv | Liebert NXL 250-400 Installation Manual 9
The following are guidelines only and 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 protection,
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.
2.2.1 Sizing the Input Breaker Feeding a Liebert NXL UPS
The rectifier nominal input current value (Table 11) is based on providing enough power to
operate the inverter at full rated load when the input voltage is nominal. The published rectifier
maximum input current value is based on the maximum input current limit setting of 125%.
The recommended input breaker ampacity is based on the NEC calculation for a branch circuit
with the current limit set at the maximum value. The calculation for an 80% rated breaker is 125%
of the nominal current (continuous) plus 100% of the difference between the nominal and the
maximum currents (non-continuous). The calculation for a 100% rated breaker is 100% of the
nominal current (continuous) plus 100% of the difference between the nominal and maximum
currents (noncontinuous).
The rectifier input current limit can be adjusted from 25% to 125% of the nominal value. This
setting is accessible only to a factory-trained service engineer. The effect of changing this setting
is similar to that of changing the setting of the trip unit on a solid-state circuit breaker. With a
lower current limit setting, the calculation for the branch circuit will result in a lower value.
The input current limit should not be set less than 105% of the current needed to support the
inverter at full load for normal operation. This results in sufficient power to recharge the battery in
a reasonable time and to operate over the published input voltage range.
2.2.2 Power Cable Connection Procedure
The rectifier input, bypass, output and battery power cables (all require lug type terminations) are
connected to busbars situated in the I/O section as shown in Figures 26 through 31.
Equipment Ground
The equipment ground busbar is located in the I/O section as shown in Figures 26 through 31.
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.
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
Vertiv. 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.

UPS Electrical Installation
Vertiv | Liebert NXL 250-400 Installation Manual 10
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.
3. Connect the ground and any necessary main bonding jumper to the equipment ground busbar located in the
I/O section.
4. Make power connections and tighten the connections to the proper torque according to one of the two
procedures below, depending on the type of installation:
Ensure correct phase rotation.
• Top Cable Entry (see Figures 19,20,25,28,29 and 30)
• Bottom Cable Entry (see Figures 19,20,25,28,29 and 31)
Top Cable Entry
When making the power connections for top cable entry, the recommended order of pulling and installing
cables is to start from the top connections to the bottom connections. The cables must be routed
around the fault braces (see Detail in Figure 30). This is to prevent the cables from contacting other
busbars. The recommended conduit layout is shown in Figure 26.
Bottom Cable Entry
When making the power connections for bottom cable entry, the recommended order of pulling and install-
ing cables is to start from the bottom connections to the top connections. The cables must be routed
around the fault braces (see Detail in Figure 31). This is to prevent the cables from contacting other
busbars. The recommended conduit layout is shown in Figure 26.
5. For control connection details, see 2.3 - Control Cable and Communication.
6. Close and secure the interior and exterior doors.
NOTE
For a single input configuration, linking busbars must be installed between the bypass and the
rectifier input.
!
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
Vertiv | Liebert NXL 250-400 Installation Manual 11
Figure 3 Cabinet grounding plates
Figure 4 Kick plate and filter locations, typical
NOTE
Kick plates must be installed. If the unit is to be installed in a position that does not permit 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)
Grounding plates are 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

UPS Electrical Installation
Vertiv | Liebert NXL 250-400 Installation Manual 12
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). The contacts are rated for 250VAC @ 2A.
Figure 5 External Interface Board connections layout
P66C P99C
TB0823
EPO
STATUS
TB0829
EXTERNA L
CAN
TB1154B TB1154A
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
Vertiv | Liebert NXL 250-400 Installation Manual 13
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.
(150m).
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
3 On Generator switch, closed = Not On Generator
Table 2 UPS control 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.
(300m).
2 Battery Interface Board TB1154-2
3 Battery Interface Board TB1154-3
4 Battery Interface Board TB1154-4
Table 3 UPS control contacts with global 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.
(150m)
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.
(150m)
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.
(150m)
2 Maintenance Bypass Cabinet, common
3Maintenance Bypass Cabinet,
closed = load on inverter
Remote EPO Input 1TB0825 1 REPO Switch, normally open contact 14AWG/500ft.
(150m)
2 REPO Switch, common contact
Key Status Input 1,3TB0820
1 Key status switch, closed = key removed
14AWG/500ft.
(150m)
2 Key status switch, common
3 Key status switch, closed = key inserted
Module Output Breaker
(MOB) Form C 2TB0815
1 CB aux. contact, closed = CB is closed
14AWG/500ft.
(150m)
2 CB aux. contact, common
3 CB aux. contact, closed = CB 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.
3. Key Status Input can be either Form-C, N.O. or N.C. contact.

UPS Electrical Installation
Vertiv | Liebert NXL 250-400 Installation Manual 14
2.3.2 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 4 UPS control contacts to remote status panel
Item
Termin
al
Block
Pi
n
Connects to
(Description of External
Item)
Wire Size/
Max Length
CAN Bus and
24V
Power Supply
TB082
9
1 Remote Status Panel TB-2
18
AWG/1000ft.
(300m)
2 Remote Status Panel TB-1
3 Remote Status Panel TB-3
4 Remote Status Panel TB-4
Table 5 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
1000ft.
(300m)
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 - Drain Wire
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
Redundant Connections
P3103-1 P3103-1 Redundant share CAN +24V
1000ft.
(300m)
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 - Drain Wire
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
1. Belden 810x or Belden 89901 cables are the only approved cables.
2. Belden 89901 cable can be used for underground installations.
3. If using multiple parallel cables for each run, all cables must be run in the same conduit.
4. Each cable group should be run in a separate grounded conduit to ensure redundancy.
5. 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.
6. 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 the ground (drain wire) to Pin 7.
7. Care must be taken to prevent the drain wire from touching any other component in the module.
8. Attach control wires to the side of the control door where the Inter-Module Board (IMC) is attached. Do not run wires across
the IMC board.