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86 Operation
3.2.8 Emergency Power Off
The Remote Emergency Power Off (REPO) mode is used to remove all power from the critical load.
The Remote Emergency Power Off control is a switch located remotely from the UPS system. It will normally be
in the same room as the critical load equipment. This mode can also be initiated by an automatic contact closure
in the same external circuit as the manually operated switch.
When you operate the Emergency Power Off switch, all UPS circuit breakers are opened including the bypass
circuit breaker. All power through the UPS is removed from the load. Typically, the REPO circuit also opens the
circuit breakers that provide power to the bypass lines and the UPS controls.
Refer to 3.3.3 - Shutdown Procedures.
Figure 55 Emergency Power Off
BIB
SKRU
MIB
MBB
I
R
#2UPS
CB1
CB2
System
Controls
RIB RIB
RIB BFB
SBB
SBS
RIB RIB
RIB BFB
#1UPS#3UPS
I
R
#1UPS
CB1
I
R
#3UPS
CB1
CB2 CB2
Output
SCCT
SCCT
(can accommodate up to 6 UPS modules)
To CriticalLoad
Battery
MBD
Battery
MBD
Battery
MBD