Vertiv Liebert Maintenance Bypass Cabinet Installation and maintenance instructions

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 fromUPStoMaintenanceBypassOperation 30
8.4 Transferring the System fromMaintenanceBypasstoUPSOperation 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.
SYMBOL DESCRIPTION
Risk of Electrical Shock
Indicates Warning or Caution
Followed by Important Instructions
AC Input
AC Output
Table 1.1 Glossary of Symbols
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SYMBOL DESCRIPTION
Requests the user to consult the manual
Equipment Grounding Conductor
On/Off
Table 1.1 Glossary of Symbols (con-
tinued)
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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-sourcecompatibleforincreased 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 page29 for instructions on use.
Figure 3.1 Bypass operation modes
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4 MAJOR COMPONENTS
The following is a general description of each component and its functions. Please review this section
carefully, as it will give you a better understanding as to how the Maintenance Bypass Cabinet operates.
4.1 Bypass Switch
The Bypass Switch allows easy and rapid transfer of connected loads between the UPS and Bypass
source.
4.2 User Selectable Output Distribution
Several receptacle and hardwire options are available as user selectable output distribution. These are
factory configured when ordered and also allow for field upgrades.
15 AMP OPTIONS 20 AMP OPTIONS 30 AMP OPTIONS
5-15R2 5-20R2 (T-slot) L5-30R
L5-15R2 L5-20R L6-30R-208
6-15R2-208 L6-20R-208 L6-30R-240
6-15R2-240 L6-20R-240 L14-30R-240
L6-15R2-208 L14-20R-240 30A,120V, 1 pole breaker w/ 1/2" & 3/4"
knockouts
L6-15R2-240 20A,120V, 1 pole breaker w/ 1/2" & 3/4"
knockouts
30A,208V, 2 pole breaker w/ 1/2" & 3/4"
knockouts
15A,120V, 1 pole breaker w/ 1/2" & 3/4"
knockouts
20A,208V, 2 pole breaker w/ 1/2" & 3/4"
knockouts
30A,240V, 2 pole breaker w/ 1/2" & 3/4"
knockouts
15A,208V, 2 pole breaker w/ 1/2" & 3/4"
knockouts
20A,240V, 2 pole breaker w/ 1/2" & 3/4"
knockouts
15A,240V, 2 pole breaker w/ 1/2" & 3/4"
knockouts
Table 4.1 Common receptacle and hardwire options
Other Options
•Single Position Blanking Plate
•Hardwire Option
4.2.1 Optional Transformer
Models offering a transformer are designed to accept the same input voltage as the UPS and provide 240
/ 208 / 120 / 120 output. Models with transformers are provided with redundant cooling fans and user
serviceable fan filters. The fans operate only when the system is in Bypass mode.
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5 PREPARATION
These installation instructions provide all the information needed for positioning the Maintenance Bypass
Cabinet (including environmental requirements) and for connecting the input and output power cables.
5.1 Inspection
Upon receiving the Maintenance Bypass Cabinet, examine the packaging for any signs of mishandling or
damage. If any damage is noted, contact your local dealer or Vertiv™ representative and notify your
carrier.
5.2 Environment
The Maintenance Bypass Cabinet environment must be free of conductive contaminants and excessive
moisture (water condensation), flammable vapors, chemical fumes, or corrosive gases and liquids.
5.3 Required Setup Equipment
The tools below are required in order to properly set up your Maintenance Bypass Cabinet:
•pallet jack
•1/2" (13 mm) wrench
•torque wrench
•flat-head screwdriver
•#2 Phillips screwdriver
•3/16" (5 mm) Allen wrench
5.4 Site Preparation
When deciding where to locate your Maintenance Bypass Cabinet, consider the weight and size of the
unit. Make sure that the structural integrity of the floor can withstand the weight. Refer to the table below
for dimensional considerations:
DIMENSIONS
Model With Transformer Without Transformer
W x D x H
In (mm)
9.5 x 26.5 x 30.4
(241.3 x 673.1 x 772.16)
Weight 287 lb (130 kg) 85 lb (38 kg)
Table 5.1 Maintenance Bypass
Cabinet physical data
Check to make sure that your Maintenance Bypass Cabinet will be located in a well-ventilated area with at
least 12 inches (304mm) in front of and behind it. Transformer based models are forced air cooled with the
aid of two internal cooling fans.
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Figure 5.1 Clearances
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6 UNLOADING
The unit frame is bolted to the shipping pallet to ensure safety. We recommend using a pallet jack to
transport the unit to its operating location prior to unbolting the unit.
6.1 Unloading the Maintenance Bypass Cabinet
CAUTION: This Maintenance Bypass Cabinet is heavy (see weight in Table 5.1 on page15). At
least two people should assist to unload it from the pallet.
1. Once the Maintenance Bypass Cabinet is near the desired operating location, remove the
cardboard cover.
2. Use a 1/2" (13mm) wrench to remove the eight
mounting bolts (four per bracket) from the pallet
brackets. Remove mounting brackets from the
pallet and Maintenance Bypass Cabinet. Keep
brackets and bolts for future transportation of the
cabinet or for securing the cabinet to the floor.
3. Remove the metal ramp from the bottom of the
pallet, rotating it 180°. Fit ramp onto opposite side
of pallet (in slot) as shown below.
4. Using two people, slowly roll the cabinet down the ramp until the unit is on a level surface (see
below, left).
5. Once the cabinet is in the desired location, adjust the leveling feet to secure its position (see
below, right).
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6.2 Stationary Mounting
Additional stability can be added by bolting the mounting brackets (used in shipping) to the floor.
For greater stability, use a higher-grade bolt. Refer to the dimensions below when drilling holes for
stationary mounting.
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