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Theory of Operation
16
Figure 2 Typical UPS system one-line diagram with optional maintenance bypass
OUTPUT
CB
Controls
Battery
Bypass CB
INPUT
CB
Static
Bypass
Switch
RIB
BFB
Critical
Load
AC Output
MBD
Static
Switch
Disconnects
THREE BREAKER MAINTENANCE BYPASS SWITCHBOARD
CONTROL POWER
UPS MODULE
MAIN INPUT
SWITCHGEAR
Rectifier/
Charger
Inverter
BIB
MBB
MIB