Liebert NXL UPS
Operation and Maintenance Manual
250-300-400-800kVA
Page 38
2.3.5
Emergency Power Off (EPO)
The local Emergency Power Off (EPO) action shuts down the rectifier, inverter and static
bypass and trips the battery circuit breaker. It does not however internally disconnect the
input mains supply. Lift the cover and press the pad.
The EPO is a guarded pad next to the display touch screen (Figure 2). Refer to 2.5 -
Shutdown Procedures
.
Figure 33 Emergency Power OFF
2.3.6
Remote Emergency Power Off (REPO)
The Remote Emergency Power Off control is a user-provided switch, located remotely from
the UPS system. It usually is installed 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 the Remote Emergency Power Off switch is operated all power through the UPS is
removed from the load. Typically, the REPO circuit also opens the input circuit breakers
that provide power to the bypass lines and the UPS controls. Refer to 2.6 –
System
Shutdown Procedures
.
Figure 34 Remote emergency power off
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