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2.15.5 Maintenance Bypass Load Transfers—Single Module System
Follow these instructions to manually transfer the load between the Maintenance Bypass and the
UPS bypass line. Do not transfer the load between the Maintenance Bypass and the UPS module
(inverter) output. Use the Monitor/Mimic Display screen to verify that the UPS bypass line is
available.
Figure 39 UPS with two-breaker bypass cabinet
MBFB
BIB
RIB
Main Input
Switchgear
NOTICE
Risk of equipment damage. Failing to follow the proper sequence when operating any circuit
breaker may cause damage to the connected equipment. Operating a Maintenance Bypass
circuit breaker out of sequence could cut off power to the critical load.
NOTICE
Risk of equipment damage. The UPS system must be on internal bypass before performing
the following procedures and operating the MIB or the MBB, or damage to the UPS may occur
and the critical load may be lost.
®
™
Liebert
NXL
Two Breaker Maintenance Bypass Cabinet
MBB
UPS Module
BFB
CB1
DC Source
MBD
DC Bus
38
CB2
Operation
Critical
Load
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