Vertiv Liebert Maintenance Bypass Cabinet Installer/user Manual
Liebert® Maintenance Bypass
Cabinet
Installer/User Guide
Technical Support Site
If you encounter any installation or operational issues with your product, check the pertinent section of
this manual to see if the issue can be resolved by following outlined procedures. For additional assistance,
visit https://www.VertivCo.com/en-us/support/
TABLE OF CONTENTS
1 Important Safety Instructions 5
2 General Description 7
2.1 System Description 7
2.1.1 Features 7
2.1.2 Standard Components 7
2.1.3 Options 7
3 Modes of Operation 11
3.1 UPS Mode 11
3.2 Bypass Mode 11
4 Major Components 13
4.1 Bypass Switch 13
4.2 User Selectable Output Distribution 13
4.2.1 Optional Transformer 13
5 Preparation 15
5.1 Inspection 15
5.2 Environment 15
5.3 Required Setup Equipment 15
5.4 Site Preparation 15
6 Unloading 17
6.1 Unloading the Maintenance Bypass Cabinet 17
6.2 Stationary Mounting 18
7 Cable Installation 21
7.1 Wiring Preparation 21
7.2 Preparing Internal Wiring 21
7.3 Dual Source Configuration 21
7.4 Removing the Cover Plates 23
7.5 REPO Connection 23
7.6 Input and Output Wiring 23
8 Operation 29
8.1 Start-Up and Initialization 29
8.2 Shutting Down the UPS 29
8.3 Transferring the System fromUPStoMaintenanceBypassOperation 30
8.4 Transferring the System fromMaintenanceBypasstoUPSOperation 30
9 Maintenance 31
9.1 Proper Care 31
9.2 Scheduled Maintenance 31
9.2.1 Replacing Fan Filters—Transformer Models Only 31
10 Specifications 33
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1 IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions that should be closely followed during installation and
maintenance of this Maintenance Bypass Cabinet.
This product is designed for commercial/industrial use only. This product is not intended for use with life
support and other designated “critical” devices. Maximum load must not exceed that shown on the UPS
and the Maintenance Bypass Cabinet rating label.
WARNING! Lethal voltages may be present within this unit even when it is apparently not
operating. Observe all cautions and warnings in this manual. Failure to do so may result in
serious injury or death. Never work alone.
The Liebert Maintenance Bypass Cabinet is designed for use on properly grounded (earthed)
208/240VAC, 60Hz supply, for installation by qualified personnel. This UPS equipment is intended to be
installed by a qualified / certified electrician who must review and approve customer supplied wiring,
circuit breakers, intended loads and verify correct input, output and grounded (earthed) connections to
ensure compliance with technical standards and national and local electrical codes. Installation
instructions and warning notices are located in the Installation section of this manual.
WARNING! To reduce the risk of fire:
The NMB1x and NMB4x models must be connected to a circuit provided with 100 amperes
maximum branch circuit overcurrent protection in accordance with applicable national and local
electrical codes.
The NMB5x and NMB8x models must be connected to a circuit provided with 125 amperes
maximum branch circuit overcurrent protection in accordance with applicable national and local
electrical codes.
Operate the UPS equipment in an indoor environment only in an ambient temperature range of 32°F to
104°F (0°C to 40°C). Install it in a clean environment, free from conductive contaminants, moisture,
flammable liquids, gases, or corrosive substances.
Never block or insert any object into the ventilation holes or other openings.
Table 1.1 Glossary of Symbols
SYMBOL DESCRIPTION
Risk ofElectrical Shock
Indicates Warningor Caution
Followed by ImportantInstructions
AC Input
AC Output
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Table 1.1 Glossary of Symbols (con-
tinued)
SYMBOL DESCRIPTION
Requests the user to consult the manual
Equipment Gr oundingConductor
On/Off
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2 GENERAL DESCRIPTION
Congratulations on your purchase of Liebert’s Maintenance Bypass Cabinet with Configurable Output
Distribution. As with every Vertiv™ product, we stand behind our quality. If you have any questions
concerning this Maintenance Bypass Cabinet, please feel free to contact your local dealer, Vertiv™
representative, or call Technical Support at 1-800-222-5877.
To ensure proper installation and operation of this unit, please read this manual thoroughly.
Installation must be done by a qualified/certified electrician, but general operation may be performed
without special training.
2.1 System Description
The Liebert Maintenance Bypass Cabinet is intended for use with the Liebert UPS units. Typical
applications include supporting workstations, servers, network, telecom or other sensitive electronic
equipment.
The Maintenance Bypass Cabinet was designed to provide maximum system availability to business
critical equipment. The Maintenance Bypass Cabinet allows for transfer of connected loads to an
alternate power path allowing full isolation of the UPS. The UPS can then be turned “OFF” and removed
from service with no interruption of power to connected loads.
2.1.1 Features
• Supports up to 20 kVA loads
• High speed transfer switch
• Compact design
• Highly configurable
• Multiple power path indicators
2.1.2 Standard Components
• Casters and leveling feet
• Easily accessible terminal blocks
• Supports Lockout/Tagout Program
• Support/mounting brackets for additional stability
• Provisions for hardwire output
• Dual-sourcecompatibleforincreased availability
2.1.3 Options
• Output transformer for isolation
• Field-installable output distribution
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Figure 2.1 Front view
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Figure 2.2 Rear view (without transformer)
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Figure 2.3 Rear view (with transformer)
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3 MODES OF OPERATION
The Maintenance Bypass Cabinet is designed to operate in two modes: UPS Mode and Bypass Mode.
3.1 UPS Mode
While the Maintenance Bypass Cabinet is in UPS Mode, the UPS is supplying the connected load with
continuous, high quality AC power. In this mode of operation, the load is protected by the UPS. The Bypass
Switch rotated toward the green lamp indicates this mode.
3.2 Bypass Mode
When the Maintenance Bypass Cabinet is in the Bypass Mode, it provides an alternate path for power to
the connected equipment. Should the UPS need to be taken out of service for limited maintenance or
repair, manual activation of the bypass will cause an immediate transfer of the equipment from the UPS
inverter to the bypass source.
The amber lamp illuminated in the Maintenance Bypass Switch compartment indicates bypass is
available. In this mode of operation the load is NOT protected by the UPS. The Bypass Switch rotated
toward the amber lamp indicates this mode. See Operation on page29 for instructions on use.
Figure 3.1 Bypass operation modes
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