Vertiv Liebert NX 225 kVA User manual

Liebert®NX™ UPS
Installation Manual — 225-600kVA, 1.0PF, 60Hz, Three-Phase, Single-Module &
Multi-Module

CONTACTING VERTIV FOR SUPPORT
To contact Vertiv Liebert Services for information or repair service in the United States, call 800-543-2378.
Liebert Services offers a complete range of startup 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 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.

Vertiv |Liebert
®NX™225-600kVA Installation Manual | Rev. 8 | 07/2017 i
TABLE OF CONTENTS
CONTACTING VERTIV FOR SUPPORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INSIDE FRONT COVER
IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
SAVE THESE 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
1.3.3 Installation Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.4.1 Moving the Cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.2 Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.3 Raised-Floor Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.4 Kick Plates and Floor Anchors for Special Seismic Certification—Optional . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.5 Kick Plate Installation—Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.6 Special Considerations for 1+N Parallel Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.7 Unpacking and Unloading the Cabinet from the Pallet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
1.5 System Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
1.6 Cable Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2.0 UPS ELECTRICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 External Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Power Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3 Sizing the Input Breaker Feeding a Liebert NX UPS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.3.1 Single or Dual Input Feeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3.2 Automatic Transfer Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3.3 Power Cable Connection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4 Control Cable and Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
2.4.1 Slot for Liebert IntelliSlot™or ManageUPS™Communication Cards—XS3 . . . . . . . . . . . . . . . . . . . . . . . . . . .12
2.4.2 Slot for LIFE Services Products—XS6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
2.4.3 Serial Interface for Liebert LIFE Services Cards (Serial Input/Output)—X6 . . . . . . . . . . . . . . . . . . . . . . . . . .13
2.4.4 Connector for REPO (Input and Status)—XT3/8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
2.4.5 Customizable Output—TB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.4.6 Customizable Input Contact—TB1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.4.7 Contact Control for Eco Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
2.4.8 Connector for Parallel UPS Connection—X19A, X19B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
2.4.9 RJ-45 Interface for Synchronization with External Signal—X20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
2.4.10 UPS Control Contacts with Battery Cabinet or Module Battery Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . .15
2.4.11 UPS Control Contacts with Global Maintenance Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
2.5 Configuring Ground Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
2.5.1 Three-Wire Input Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
2.5.2 Preferred Grounding Configuration, Battery Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
2.5.3 High-Resistance Ground Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

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2.6 Distributed Static Switch (1+N) System Cabling Layouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
3.0 OPTIONAL EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.1 Single-Module System Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.1.1 Input Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.1.2 External Battery Temperature Sensor—Optional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.1.3 Matching Liebert NX Battery Cabinet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.1.4 Battery Interface Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.1.5 Local EPO Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.2 Communication and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.2.1 Remote Status Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.2.2 Alber Monitoring System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.2.3 Capacity on Demand (Softscale) Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.3 Multi-Module System Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.3.1 Paralleling Cable Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.3.2 Load Bus Sync Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.3.3 Multi-Bus Synch Module (MBSM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.0 INSTALLATION DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.0 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
FIGURES
Figure 1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Figure 2 Cabinet arrangement—Liebert NX matching battery cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Figure 3 Grounding diagram—Three-wire single-module systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 4 Grounding diagram—Three-wire multi-module systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Figure 5 System layout, 1+N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 6 SKRU connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Figure 7 Control wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Figure 8 REPO connections 1+N system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 9 Main components, 225-300kVA Liebert NX UPS, SMS and 1+N multi-module unit with static
bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 10 Outline drawing, 225-300kVA Liebert NX, SMS and 1+N multi-module unit with static
bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 11 225-300kVA low-voltage cable routing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 12 Base Drawing, 225-300kVA Liebert NX, SMS and 1+N multi-module unit with static
bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 13 Terminal details, 225-300kVA Liebert NX, SMS and 1+N multi-module unit with static
bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 14 Terminal details Liebert NX 225kVA - 300kVA UPS 1+N multi-module or SMS . . . . . . . . . . . . . . . . . 29
Figure 15 Main components, 400-600kVA Liebert NX UPS, SMS and 1+N multi-module unit with
static bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 16 Outline drawing, 400-600kVA Liebert NX, SMS and 1+N multi-module unit with static
bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 17 Base Drawing, 400-600kVA Liebert NX, SMS and 1+N multi-module unit with static bypass . . . 32
Figure 18 Terminal details, 400-600kVA Liebert NX, SMS and 1+N multi-module unit with static
bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

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Figure 19 Terminal details Liebert NX 400kVA - 600kVA UPS 1+N multi-module or SMS. . . . . . . . . . . . . . . . . 34
Figure 20 Recommended control wiring for Liebert NX 225-600kVA single module, Eco Mode . . . . . . . . . . . 35
Figure 21 Recommended control wiring for Liebert NX 225-600kVA multi-module, Eco Mode. . . . . . . . . . . . 36
TABLES
Table 1 REPO connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Table 2 Customizable output contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Table 3 Customizable input contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Table 4 Battery interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Table 5 Maintenance bypass key status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Table 6 Maintenance Bypass SKRU Enable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Table 7 Liebert NX UPS specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 8 UPS rating at altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 9 Current ratings—rectifier input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 10 Current ratings—battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 11 Recommended DC circuit breaker rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 12 Current ratings—bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 13 Current ratings—output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 14 Current-versus-time curves of overload capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 15 Recommended conduit and cable sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Table 16 Recommended torque values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 17 Recommended lug sizes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 18 Components required for seismic configuration meeting OSHPD regulations . . . . . . . . . . . . . . . . . . 43

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Vertiv™|Liebert®NX™225-600kVA Installation Manual | Rev. 8 | 07/2017 1
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions that should be followed during installation of your Liebert NX 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-25434, 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 4450 lb. (2019kg).
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.

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NOTICE
This unit complies with the limits for a Class A digital device, pursuant to Part 15 Subpart J of 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.
!
WARNING
Risk of electrical shock and fire. Can cause equipment damage, injury and death.
Internal battery strapping must not be removed. Failure to heed this warning could result in smoke, fire or
electric hazard. If strapping is removed, consult your local representative before attempting to transport
the battery cabinet.
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.

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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 NX 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
Risk of incorrect input power connection. Can cause equipment damage.
The standard Liebert NX UPS is suitable for connection to three-phase, three-wire plus ground input power.
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.
NOTE
Do not apply electrical power to the UPS equipment before the arrival of the commissioning engineer.
Connecting power before the commissioning engineer determines the system is properly installed may void the
warranty.

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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 7).
The Liebert NX 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 NX 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.
NOTICE
There is a potential risk to the operational integrity of an installed UPS system by the presence of foreign material inside or
in the vicinity of the UPS module.
This risk is especially high if conductive materials find their way inside the UPS module.
The risk potentially involves damage to the installed UPS equipment and subsequent degradation or loss of power to the
connected critical site load.
Vertiv applies the highest safety standards in equipment design to ensure that no live parts are exposed to external
contact, and also to ensure that the equipment is protected against the introduction of foreign bodies during operation.
However, it is not possible for Vertiv to ensure that foreign bodies will not be introduced during on-site installation, or
when the UPS doors and covers are “open” and the electrical terminals are exposed to allow power line connections to be
made by the electrical contractor/installer.
To prevent major disruption to site operations and risk to property and personnel, including the possibility of a fatality,
each site’s facility manager or construction manager must prevent foreign bodies from being introduced into the UPS
module.
All UPS modules are thoroughly inspected by Vertiv engineers prior to placement into service and testing on-site.
However, the person responsible for the site must ensure that the UPS module, and the immediate surroundings, are kept
clean and free from any possible conductive material such as metal foil, food wrappers, cable shields, washers and other
hardware, scrap metal and dust.
If the UPS system is shut down after placement into service and testing are completed, the UPS room must be kept clean
to avoid the possibility (during restart) of the considerable volume of air-flow produced by UPS operation to dislodge
and/or drag any foreign bodies into the equipment, which would result in system failure and possible supply interruption to
the critical site load, and several hours of downtime resulting from the damage typically associated with such events.
If the UPS is left running/operational at the completion of placement into service and testing, the room similarly needs to
be kept clean to prevent foreign bodies from entering the UPS module via its forced air-flow.
1.3.2 Storing the UPS and Batteries for Delayed Installation
If the Liebert NX system will not be installed immediately, it must be stored indoors in a clean, dry and cool
location (see Environmental Parameters in Table 7). 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.
NOTE
The UPS is suitable for mounting on concrete or other non-combustible surface only.

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1.3.3 Installation Altitude
The maximum operating altitude of the UPS, without derating, is 3300ft. (1000m). At higher altitudes the load
must be reduced according to Table 8.
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. The front door can be opened 90 degrees for more flexibility in installations.
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 7.
Move the UPS with a forklift or similar equipment to ease the relocation and to reduce vibration. The optional
battery cabinets should be moved with a forklift or similar equipment.
When handling the UPS 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 NX 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 allow the module to
be serviced and 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.
!
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 4450 lb. (2019kg).
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.

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1.4.4 Kick Plates and Floor Anchors for Special Seismic Certification—Optional
For seismic resistant installations and OSHPD compliance, special floor anchors and kickplates must be used for
the UPS and matching battery cabinets; see Table 18.
The California Office of Statewide Health Planning and Development (OSHPD) enforces International Building
Code requirements for Special Seismic Certification except that the office reduces the required scope of
certifications.
1.4.5 Kick Plate Installation—Standard
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.
1.4.6 Special Considerations for 1+N Parallel Systems
Consider the grounding configuration of your system before finalizing module placement See 2.5 - Configuring
Ground Connections.
Vertiv recommends matching the impedance in the bypass path of paralleled systems as closely as possible to
ensure good bypass current sharing.
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.
For Liebert NX Systems, the total combined cable length of the bypass feeder cables and the module output
cables for each module must be within 5% from maximum to minimum. The combined cable length is the sum of
the length from the common source feeding all the modules to the common output switchboard.
If the cabling impedances need to be greater than 5%, 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 5%, the bypass impedances must be balanced or the load must be limited to less than the maximum rating.
The output switchboard for any 1+N system must be configured with one Module Output Circuit Breaker (MOB)
for each UPS module that is to be connected to that switchboard. The breaker must be equipped with auxiliary
contacts that will be monitored by the UPS in order for interlocks to function properly and for the HMI to indicate
the bypassed status of the module.
Vertiv recommends using magnetic or thermomagnetic breakers. If molded case switches will be used, Vertiv
recommends installing breakers without electronic trip units or to set the trip units high enough to
accommodate high instantaneous currents that may be present when switching a module into an active bus.
For 225-250kVA Modules—Set instantaneous trip settings to allow for 2000A for 2 milliseconds.
For 400-600kVA Modules—Set instantaneous trip settings to accommodate 3000A for 2 milliseconds

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1.4.7 Unpacking and Unloading the Cabinet from the Pallet
The utmost care must be taken when removing the packaging to prevent damage to the equipment. Check all
packaging materials to ensure that no important items are discarded. Once the packaging has been removed,
the UPS must be taken off the pallet by removing the retaining screws, as illustrated in Figure 1, and lifting the
unit off using a fork lift Do not remove the retaining brackets securing the UPS to the pallet because they are
used to fasten the UPS to the floor, except where OSHPD compliance is required and the optional OSHPD
seismic anchoring kits are used.
Figure 1 Unpacking
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 2.

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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 2 Cabinet arrangement—Liebert NX matching battery cabinets
If the cabinets are to be bolted together, the side panels must be removed before beginning.
Liebert
NX
UPS
Liebert
NX
Battery
Cabinet
Liebert
NX
UPS
Additional
Liebert
NX
Battery
Cabinets
Battery Cabinets must
be installed on left of
UPS to wire internally

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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 Figure 14 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 9 through 12, 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 12.
The following are guidelines only and are superseded by local regulations and codes of practice where
applicable:
• 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.
!
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.

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2.3 SIZING THE INPUT BREAKER FEEDING ALIEBERT NX UPS
Nominal input current (considered continuous) is based on full-rated output load. Maximum current includes
nominal input current and maximum battery recharge current (considered noncontinuous).
Continuous and noncontinuous current are defined in the NEC.
Maximum input current is controlled by the current limit setting, which is adjustable. Values shown are for
maximum current limit. If a smaller input feed breaker is used, the input current limit can be adjusted; see your
Vertiv representative for more information. 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 Single or Dual Input Feeds
The Liebert NX 225-600 kVA may be fed from single reference sources or dual asynchronous sources. If a
single-input configuration will be used, the utility source must be cabled to the rectifier input busbars. See
Figures 13 and 18.
2.3.2 Automatic Transfer Switches
If the UPS is to be fed from an automatic transfer switch, the transfer switch must have a programmed delay of
100 milliseconds for transfers between two sources.
NOTE
See 3.2.3 - Capacity on Demand (Softscale) Upgrades.

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2.3.3 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.
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.
2. Check that these supplies are electrically isolated and post any necessary warning signs to prevent their inadvertent
operation.
3. Open exterior and interior panels on the front of the I/O sections.
4. Connect the ground to the equipment ground busbar located in the I/O sections.
5. Make power connections and tighten the connections to the proper torque.
Ensure correct phase rotation.
6. For control connection details, see 2.4 - Control Cable and Communication.
7. Close and secure the interior and exterior doors.
8. Attach the kick plates to the bottom of the unit.
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.
!
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 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.

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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). Refer to Figures 9 and 15.
The Liebert NX is equipped with the following interfaces:
• XS3 - Slot for Liebert IntelliSlot™or ManageUPS™communication card
• XS6 - Slot for LIFE™Services modem
•X3-Reserved
• X6 - Serial interface for external LIFE Services
•XT1/2-NotUsed
•X9-Reserved
• XT3/8 - 4-pole screw connector for REPO Input and REPO Status
•XT4-Reserved
• TB1 - 16-pole screw connector for input contacts
• TB2 - 16-pole screw connector for output contacts
• X19A/B - 2x15-pole connectors for parallel UPS connection
• X20 - RJ-45 interface for synchronization with external signal
•XT1-NotUsed
• TB3 - Battery Interface and Key Status
• TB4 - SKRU Enable
2.4.1 Slot for Liebert IntelliSlot™or ManageUPS™Communication Cards—XS3
This slot is the interface for the Liebert network communication cards. This adapter provides an independent
external network interface for communication with network monitoring and building management systems.
Units built since June 2016 are equipped with either the Liebert IntelliSlot system or the ManageUPS system.
Previous units included a factory-installed ManageUPS system, which provided connectivity to SNMP and
Modbus.
The Liebert IntelliSlot platform includes the Liebert IS-UNITY-DP™and Liebert IS-485 EXI™ cards. The platform
communicates with Vertiv software tools and services, including Trellis®, Liebert SiteScan®Web and Liebert
Nform®.
The Liebert IS-UNITY-DP supports up to two third-party protocols along with HTTP/S (Web), Vertiv Protocol,
SMTP and SMS.
Third-party protocols available on the Liebert IS-UNITY-DP card are:
• BACnet IP—BACnet over Internet Protocol
• BACnet MSTP—BACnet Master-Slave/Token-Passing (MSTP) communications protocol over an RS-485 serial network
(also known as BACnet MSTP RS-485)
•ModbusRTU
•ModbusTCP
•SNMPversions1,2cand3
The Liebert IS-485 EXI Card connects to a Liebert SiteLink-E™, allowing Liebert SiteScan Web 4.0 monitoring
and control.
NOTE
No more than two protocols may be enabled on one card.
Only one version of BACnet may be selected, either BACnet IP or BACnet MSTP.
Only one version of Modbus may be selected, either Modbus TCP or Modbus RTU.
Only one of the protocols can use the 485 port; choosing two 485 protocols will cause conflicts.

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Protocols available on the ManageUPS card, depending on the card model, are:
• Modbus RTU—Modbus Remote Terminal Unit (RTU) communication protocol over RS-232, RS-422 and RS-485
• Modbus TCP—Modbus Transmission Control Protocol over Internet Protocol (also known as Modbus TCP/IP)
•SNMPversion1
•Ethernet
•HTTP/Web
2.4.2 Slot for LIFE Services Products—XS6
This slot is the reserved interface for LIFE Services modem card. This card provides an independent external
modem interface for communication with LIFE Services service station. Ask your local Vertiv representative for
more details on LIFE Services and its benefits for your UPS system.
2.4.3 Serial Interface for Liebert LIFE Services Cards (Serial Input/Output)—X6
The service interface is a SUB-D nine-pin male connector for RS-232 serial communication. It is used for
communications with external LIFE Services or other special Liebert applications.
2.4.4 Connector for REPO (Input and Status)—XT3/8
This four-pole screw connector allows:
• Switching off the UPS from a remote source (e.g., push button)
• Providing status to an external system regarding whether the REPO is active
To perform a remote emergency power off, it is necessary to connect an emergency stop button to the UPS via a
shielded cable not exceeding 66ft. (20m) in length. The switch must be “Closed” under normal operating
conditions and be equipped with a mechanism that maintains it in the “Open” position after it has been pressed.
If this button is not installed, a jumper lead must be connected between Pins 1 and 2. For an indication of REPO
status, connect Pin 3 and Pin 4 to an external system.
Use 16-22AWG cable.
Table 1 REPO connection
Pin Signal Explanation
1 & 2 REPO Input Contact REPO active when open
3 & 4 REPO Status Contact Open when REPO is active
!
WARNING
The external push button must be voltage free and isolated from all sources and GND. The external REPO
system must not exceed 24V and 20mA.
NOTE
The external EPO switch must latch open when activated.

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2.4.5 Customizable Output—TB2
This 16-pole screw connector allows the connection of six individual configurable output contacts. Each contact
is rated for 24VDC 1A. The maximum potential difference between the pins must not exceed 24VDC.
Use 16-22AWG cable. The selectable contacts can be customized (by qualified technicians only) to perform
various functions.
2.4.6 Customizable Input Contact—TB1
This 16-pole screw connector allows the connection of four individual configurable input contacts.
Each contact is rated for 24VDC 1A. The maximum potential difference between the pins must not exceed 24VDC.
Use 16-22AWG cable. All input contacts can be programmed using service software.
Table 2 Customizable output contacts
Pin Signal Explanation
1 Normally Closed Alarm Summary
2 Normally Open
3 Normally Closed Bypass Active
4 Normally Open
5 Normally Closed Low Battery
6 Normally Open
7 Normally Closed AC Fail
8 Normally Open
9 Common Pins 1-8
10 Not Available
11 Normally Closed Selectable
12 Normally Open
13 Common Pins 11-12
14 Normally Closed Selectable
15 Normally Open
16 Common Pins 14-15
Table 3 Customizable input contacts
Pin Signal Explanation
1 Input #1 (24VDC out)
Selectable 1
2 Input #1 (24VDC signal)
3 Input #2 (24VDC out)
Selectable 2
4 Input #2 (24VDC signal)
5 Input #3 (24VDC out)
Selectable
6 Input #3 (24VDC signal)
7 Input #4 (24VDC out)
Selectable
8 Input #4 (24VDC signal)
9-16 Common Pins 1-8 Not Available
1. This contact is used for the MBB auxiliary contacts. See Figure 5.
2. For 1+N systems, the auxiliary contacts for the MOB breaker must be connected to these inputs. See Figure 5. A shorting switch may be connected here for
Load Bank Breaker/Testing.
!
WARNING
To drive the inputs, use no-voltage contacts. Do not use voltages supplied by external power supply.