Vertiv Liebert EXM2 - UPS Shutdown Procedures; Procedures for Completely Powering down UPS; Procedures for Completely Powering down UPS While Maintaining Power to Load; EPO Procedures

6.5 UPS Shutdown Procedures
6.5.1 Procedures for Completely Powering Down UPS
Complete UPS shutdown and load power-off should follow this procedure. All power switches, isolating switches and breakers
are disconnected, and then UPS no longer supplies power to load.
CA U T IO N: The follow ing procedures w ill cut off the load pow er, m aking the load com pletely
pow er off.
1. Click the INVERTER OFF key to stop the operation of the inverter (Refer to Operator Controls ). Then press the
EPO button to stop the operation of the rectifier, static switch and battery.
2. Disconnect the switch of the external battery.
3. Disconnect the rectifier input switch Q1, bypass input switch Q2, output switch Q5. At the moment, all the internal
power supply is off and the TOUCHSCREEN does not display any more.
W A RN IN G!
1. Post a lab el at the AC input distribution (generally far aw ay from the U P S) to alert that the
UP S m aintenance is being operated.
2. W ait 10 m inutes for the internal D C bus capacitance discharg ing . Then the U PS is
com pletely shut down.
W A RN IN G! hazardous battery voltage
The battery term inals still have hazardous voltage after the U PS is com pletely shut dow n .
6.5.2 Procedures for Completely Powering Down UPS while Maintaining Power to
Load
The following procedures are suitable for completely powering down the UPS and still keeping the power supply to the load.
Refer to the procedures in Transfer from Normal Mode to Maintenance Mode
6.6 EPO Procedures
The EPO is designed to switch off the UPS in emergency conditions (that is, fire, flood, etc.). To carry out EPO, you just need to
press the EPO button, then the system will turn off the rectifier, inverter and stop powering the load immediately (including
the inverter and bypass), and the battery stops charging or discharging.
After EPO, if the input mains is present, the UPS's control circuit will remain active; however, the output will be turned off. To
remove all power from the UPS, first disconnect the external power switch of the UPS.
6 Single UPS Operation Introduction
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Vertiv™ Liebert® EXM2 UPS User Manual