Vertiv Liebert EXS 80kVA UPS, User Manual

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Vertiv™ Liebert EXS 80kVA UPS User Manual
9 Options
9.7 Output Transformer
This UPS includes an isolation transformer (see Figure 9-4 for its position) at the UPS output. This
transformer is installed in the cabinet and provides electrical isolation between the UPS output and the
load.
NOTE: When there is an inner transformer, the C-type breaker of 200A should be installed at upstream
of the UPS.
Figure 9-4 Output transformer and its working principle
Output transformer
Battery BCB
Maintenance bypass switch Q3
Automatic bypass switch
UPS
Bypass input
Shorting copper bar
of common input
configuration
Mains input
Neutral line
input
Bypass input switch Q2
Rectifier input
switch Q1
Rectifier
DC bus
Inverter
Charger
Automatic
inverter switch
Output
switch Q5
ABC
Output
transformer
abc UPS output
Neutral line
output
N
n
WARNING! 1. The optional output transformer is only suitable for 3-in 3-out mode.
2. When switching on the maintenance bypass switch, the output transformer is still live. During
the transformer maintenance, you must shut down the UPS completely.