Vertiv Liebert NXL 500kVA User manual

Liebert®
NXL™ UPS
Installation Manual
500 kVA – 750 kVA, 0.9 PF, 60 Hz, Three-phase, Single-module and Mulit-module

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information or for any errors or omissions. Refer to other local
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tools, and materials to be used in performing procedures not
specifically described in this document.
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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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
2.3 Sizing the Input Breaker feeding a Liebert®NXL™UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3.1 Power Cable Connection Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4 Control Cable and Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.4.1 Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.4.2 Multi-Module Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.4.3 Remote Input Breaker (RIB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.4.4 Inverter Output Breaker (IOB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.5 Digital LBS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
2.6 Configuring Neutral and Ground Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.6.1 Four-Wire Input connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.6.2 Three-Wire Input connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.6.3 Preferred Grounding Configuration, Battery Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.6.4 Multi-Module Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.6.5 High Resistance Ground Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.7 Grounding Diagrams, Single- and Multi-Module Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
3.0 OPTIONAL EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
3.1 Single-Module System Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
3.1.1 Matching Maintenance Bypass Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.1.2 Battery Temperature Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.1.3 Matching Liebert®NXL™Battery Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.1.4 Matching Module Battery Disconnect—MBD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
3.1.5 Load Bus Synch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.1.6 Remote Alarm Status Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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3.2 Communication and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
3.2.1 Alber®Monitoring System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.2.2 Programmable Relay Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
3.2.3 Input Contact Isolator Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.0 INSTALLATION DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.1 Programmable Relay Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
5.0 SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
FIGURES
Figure 1 Cabinet arrangement—Liebert NXL, battery cabinets, maintenance bypass cabinet.
6
Figure 2 Cabinet EMI plates - 625kVA and 750kVA only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 3 Kick plate and filter locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 4 Low-voltage cable installation—top entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 5 External Interface Board connections layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 6 Inter-Module Communication Board wiring diagram—Multi-modules . . . . . . . . . . . . . . 12
Figure 7 Remote Input Breaker diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 8 Remote Output Breaker diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 9 Inter-Module Communication Board wiring diagram—Digital LBS. . . . . . . . . . . . . . . . . . 16
Figure 10 Grounding diagram, three-wire single-module system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 11 Grounding diagram, four-wire single-module system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 12 Grounding diagram, three-wire multi-module system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 13 Grounding diagram, four-wire multi-module system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Figure 14 Control wiring, Programmable Relay Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Figure 15 Programmable relay board dialog box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Figure 16 Input contact isolator dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Figure 17 Optional Input Contact Isolator Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Figure 18 Main components, 500kVA Liebert NXL SMS and 1+N multi-module unit with static
bypass26
Figure 19 Outline drawing, Liebert NXL 500kVA UPS SMS and 1+N multi-module unit with stat-
ic
bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Figure 20 Input terminal details, Liebert NXL 500kVA UPS, SMS and 1+N multi-module unit with
static
bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Figure 21 Output terminal details, Liebert NXL 500kVA UPS, SMS and 1+N multi-module unit
with
static bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Figure 22 Base drawing, Liebert NXL 500kVA UPS, SMS and 1+N multi-module unit with static
bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Figure 23 Field connections, shipping split 500kVA Liebert NXL, multi-module or SMS with
static
bypass, Page 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 24 Field connections, shipping split 500kVA Liebert NXL, multi-module or SMS with
static
bypass, Page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

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Figure 25 Main components, 625/750kVA Liebert NXL, N+1 multi-module unit without static
bypass34
Figure 26 Main components, 625/750kVA Liebert NXL UPS, SMS and 1+N multi-module unit
with
static bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Figure 27 Outline drawing, 625/750kVA Liebert NXL, N+1 multi-module unit without static by-
pass36
Figure 28 Outline Drawing, 625/750kVA Liebert NXL, SMS and 1+N multi-module unit with stat-
ic
bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Figure 29 Base detail drawing, 625/750kVA Liebert NXL, N+1 multi-module unit without static
bypass38
Figure 30 Base Drawing, 625/750kVA Liebert NXL, SMS and 1+N multi-module unit with static
bypass39
Figure 31 Input terminal detail, 625/750kVA Liebert NXL, N+1 multi-module unit without static
bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 32 Input terminal detail, 625/750kVA Liebert NXL, SMS and 1+N multi-module unit with
static
bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 33 Output terminal detail, 625/750kVA Liebert NXL, N+1 multi-module unit without stat-
ic
bypass, cont’d . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Figure 34 Output terminal detail, 625/750kVA Liebert NXL, SMS and 1+N multi-module unit
with
static bypass, cont’d. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Figure 35 Shipping split 625/750kVA Liebert NXL without static bypass . . . . . . . . . . . . . . . . . . . . 44
Figure 36 Shipping split 625/750kVA Liebert NXL without static bypass (continued) . . . . . . . 46
Figure 37 Shipping Split, 625/750kVA Liebert NXL, SMS and 1+N multi-module unit with static
bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 38 Shipping Split, 625/750kVA Liebert NXL, SMS and 1+N multi-module unit with static
bypass, continued . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 39 Single-input wire cabinet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Figure 40 Alternate Liebert NXL 500kVA bottom cable entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Figure 41 Control wiring, Programmable Relay Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Figure 42 Inverter overload data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Figure 43 Bypass overload data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
TABLES
Table 1 UPS input dry contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 2 UPS control contacts with global maintenance bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 3 UPS control contacts to remote status panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 4 UPS control contacts with battery cabinet or module battery disconnect . . . . . . . . . . 11
Table 5 Parallel from UPS module Inter-Module Communication Board to other Inter-Module
Communication Board in system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 6 RIB UV coil, aux. contacts from UPS RIB CB interface board to remote CB1. . . . . . . . . 14
Table 7 Remote IOB contacts from remote breaker to UPS IOB CB interface board . . . . . . . . . 15

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Table 8 Wire size, length for digital LBS connection of UPS Inter-Module Communication
Boards16
Table 9 Programmable Relay Board pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Table 10 Input Contact Isolator Board pre-assigned values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Table 11 Input Contact Isolator Board control wiring connections . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Table 12 Programmable Relay Board pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Table 13 Liebert NXL UPS specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Table 14 Current ratings—rectifier input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Table 15 Current ratings—bypass input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Table 16 Current ratings—output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Table 17 Current ratings—battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Table 18 Recommended conduit and cable sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
Table 19 Recommended torque values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Table 20 Recommended lug sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Vertiv | Liebert®NXL™500-750kVA UPS 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 is up to 13,800lb. (6260kg).
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.

Vertiv | Liebert®NXL™500-750kVA UPS 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 communications.
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.

Vertiv | Liebert®NXL™500-750kVA UPS Installation Manual | 3
1.0 MECHANICAL INSTALLATION
1.1 Introduction
This 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
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.
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.

Vertiv | Liebert®NXL™500-750kVA UPS 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 13).
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 13). 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 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.
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.

Vertiv | Liebert®NXL™500-750kVA UPS Installation Manual | 5
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 13.
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 24in (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 the 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 rear kick plates, then the 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 is up to 13,800lb. (6260kg).
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.

Vertiv | Liebert®NXL™500-750kVA UPS 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
2.6 - 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 on-line 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 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.

Vertiv | Liebert®NXL™500-750kVA UPS Installation Manual | 7
Figure 1 Cabinet arrangement—Liebert®NXL™, battery cabinets, maintenance bypass cabinet
Liebert®
NXL
™
UPS
Liebert®
NXL
™
UPS
Maintenance
Bypass
Cabinet
(Matching)
Battery
Cabinet
(Matching)
Liebert®
NXL
™
UPS
Maintenance
Bypass
Cabinet
(Matching)
Additional
Battery
Cabinet(s)
(Matching)
Battery
Cabinet
(Matching)
Liebert®
NXL
™
UPS
Additional
Battery
Cabinet(s)
(Matching)
Battery
Cabinet
(Matching)
Liebert®
NXL
™
UPS
Additional
Battery
Cabinet(s)
(Matching)
The side panels and hangers must be
removed before the cabinets can be
bolted together.
Note: Battery cabinets can be
bolted to the right of the UPS.
However, the cabling must be

Vertiv | Liebert®NXL™500-750kVA UPS 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 13 - 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 14 through17, 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 17.
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.

Vertiv | Liebert®NXL™500-750kVA UPS Installation Manual | 9
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 13.
• 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.
2.3 Sizing the Input Breaker feeding a Liebert®NXL™UPS
The rectifier nominal input current value (Table 14) 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 a 100% rated breaker is 100%
of the nominal current (continuous) plus 100% of the difference between the nominal and the
maximum currents (noncontinuous).
The rectifier input current limit can be adjusted from 25% to 125% of the nominal value. This
setting is only accessible 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.
2.3.1 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
DRAWINGS). 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.

Vertiv | Liebert®NXL™500-750kVA UPS 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 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 2.4 - Control Cable and Communication.
6. Close and secure the interior and exterior doors.
7. Attach the cabinet EMI plates to the top of the UPS at each shipping split (625kVA or 750kVA only). See
Figure 2.
8. Attach the kick plates and filters to the bottom of the unit. See Figure 3.
Figure 2 Cabinet EMI plates - 625kVA and 750kVA only
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.
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.
Note location
of larger cutouts.
Orient ground plate
as shown.
A
Mounting
Hardware
(Supplied)
Installed at Each Shipping Split
Detail A

Vertiv | Liebert®NXL™500-750kVA UPS Installation Manual | 11
Figure 3 Kick plate and filter locations
Figure 4 500-kVA Models Low-voltage cable installation—top entry
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 the kick plates must be installed before the unit is placed in its final
position.
Install Factory-Supplied
Bolt, Lockwasher and
Washer, 4 Places,
Front Side
Install Factory-Supplied
Bolt, Lockwasher and
Washer, 4 Places,
Rear Side
Install Factory-Supplied
Bolt, Lockwasher and
Washer, 2 Places
Each Side
Install Factory-Supplied
Bolt, Lockwasher and
Washer, 2 Places,
Each Side
FRONT
Kickplate
Kickplate
REAR
Kickplate
Kickplate
Kickplate
D
DETAIL D
E
DETAIL E
G
DETAIL G
F
Cable Entry

Vertiv | Liebert®NXL™500-750kVA UPS Installation Manual | 12
Figure 5 625 - 750-kVA Models Low-voltage cable installation—top entry
2.4 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 6 External Interface Board connections layout
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
P66C P99C
TB0823
EPO
STATUS
TB0829
EXTERNAL
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 VOLTAGE
EXTERNAL
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

Vertiv | Liebert®NXL™500-750kVA UPS Installation Manual | 13
2.4.1 Dry Contacts
NOTE
If connection to more than one module is required, use a separate, isolated contact for each
module.
Table 1 UPS input dry contacts
Item
Termin
al
Block
Pi
n
Connects to
(Description of External Item)
Wire Size/
Max Length
Remote EPO
Input Form C
TB082
4
1 REPO Switch, normally open contact
14AWG/
500ft.
(150m)
2 REPO Switch, common contact
3
REPO 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
Termin
al
Block
Pi
n
Connects to
(Description of External Item)
Wire Size/
Max Length
CAN Bus and
24V Power Supply
TB1154
A
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
Termin
al
Block
Pi
n
Connects to
(Description of External Item)
Wire Size/
Max
Length
Maintenance
Isolation Breaker
(MIB) Form C1TB0811
1 CB aux. contact, closed = CB is closed 14AWG/500
ft.
(150m)
2 CB aux. contact, common
3 CB aux. contact, closed = CB is open
Maintenance
Bypass
Breaker (MBB) Form
C1
TB0813
1 CB aux. contact, closed = CB is closed 14AWG/500
ft.
(150m)
2 CB aux. contact, common
3 CB aux. contact, closed = CB is open
Maintenance
Bypass
Enable Form C1TB0821
1Maintenance Bypass Cabinet,
closed = load not on inverter 14AWG/500
ft.
(150m)
2 Maintenance Bypass Cabinet, common
3Maintenance Bypass Cabinet, closed = load on
inverter
Remote EPO Input1TB082
5
1 REPO Switch, normally open contact 14AWG/500
ft.
(150m)
2 REPO Switch, common contact
Key Status Input
Form C1,3TB082
0
1 Key status switch, closed = key removed 14AWG/500
ft.
(150m)
2 Key status switch, common
3 Key status switch, closed = key inserted

Vertiv | Liebert®NXL™500-750kVA UPS Installation Manual | 14
Module Output
Breaker
(MOB) Form C2TB0815
1 CB aux. contact, closed = CB is closed 14AWG/500
ft.
(150m)
2 CB aux. contact, common
3 CB aux. contact, closed = CB is open
1. For 1+N systems with a maintenance Bypass, these auxiliary contacts must be run to each module from an
isolated source.
2. For 1+N systems, these breaker Aux contacts go to the UPS that they are associated with.
3. Key Status Input can be either Form-C, N.O. or N.C. contact
Table 3 UPS control contacts with global maintenance bypass (continued)
Item
Termin
al
Block
Pi
n
Connects to
(Description of External Item)
Wire Size/
Max
Length