IMPORTANT! Wait 10 minutes for the internal DC bus capacitance discharging. Then the UPS is completely shuts
down.
WARNING! Hazardous battery voltage. The battery terminals still have hazardous voltage after the UPS is
completely shutdown.
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 keeping the power supply to the load. Refer
to the procedures in Transfer from normal mode to maintenance mode on page114.
6.6 EPO Procedures
The EPO is designed to switch off the UPS in emergency conditions (such as fire, flood, and so on). 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 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.
6.7 UPS Reset Procedures after EPO
After shutting down the UPS through EPO or the UPS fault condition, clear the fault according to the alarm message
appearing on TOUCH SCREEN. Then carry out the following reset procedures to make UPS resume normal operation.
After confirming the fault has been cleared and no remote EPO signal is received, the user can carry out the following
procedures:
1. Click the Reset Fault button (see Operator controls on page68), the system will exit the EPO/abnormal OFF
state, and the alarm indicator flashes in red color.
2. After the rectifier start up is finished, normally start the UPS according to Transfer from Bypass Mode to Normal
Mode on page113.
NOTE: The rectifier will start automatically when the overtemperature fault disappears five minutes after the
disappearance of overtemperature signal.
3. After the EPO button is pressed, if the mains input is switched off, the UPS will shutdown completely. When the
mains input restored, the UPS will enable the bypass. Restore the power at the output terminal of the UPS.
WARNING! If the maintenance bypass switch Q3 is closed, and UPS has input power, it means UPS has
outputs.
6.8 Automatic Restart
The UPS uses the battery system to supply power to the load equipment in the event of mains failure until the batteries are
discharged. When the UPS reaches its EOD threshold, it will shutdown.
The UPS will automatically restart and enable output power only when the following conditions are met:
118 Proprietary and Confidential ©2023 Vertiv Group Corp. 6 Single UPS Operation
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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