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 (press the button at least 1 s), 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.
6.7 UPS Reset Procedures after EPO
After shutting down the UPS through EPO or reasons of UPS fault, clear the fault according to the alarm message displayed
on TOUCHSCREEN. 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 (Refer to Operator Controls), 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.
N O T E: The rectifier w ill start autom atically w hen the overtem perature fault disappears five m inutes
after the d isappearance of overtem perature signal.
3. After pressing the EPO button, if the mains input is switched off, the UPS will shut down completely. When the
mains input returns, the UPS will start up on bypass. There will be power at the output terminals of the UPS.
W ARN ING ! If the m aintenance bypass sw itch Q3 is closed, and UP S has input p ow er, it m ean s
UPS has ou tputs.
6.8 Automatic Restart
In the case of a mains failure, the UPS draws power from the battery system to supply the load until the batteries are depleted.
When the UPS reaches its EOD threshold, it will shut down.
The UPS will automatically restart and enable output power only when the following conditions are met:
1. If Auto Recovery after EOD is enabled.
2. After the Auto Recovery after EOD Delay Time expires (the default delay is 10 minutes), the UPS restarts bypass,
then inverter. During the automatic recovery delay, the UPS will charge its batteries to provide a safety margin for
equipment shutdown if input power fails again.
N O T E: During the au tom atic restart p rocess, manual startup is disabled. Autom atic restart m ust be
set by Vertiv 's authorized service engineer through V ertiv setting softw are.
3. If the UPS disables Automatic Restart function, the user can first execute ‘Reset Fault’. After the rectifier start-up
is finished, start the UPS following normal procedures.
6 Single UPS Operation Introduction
108
Vertiv™ Liebert® APM Plus User Manual
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