Vertiv Liebert EXM2 - UPS Reset Procedures after EPO; Automatic Restart

6.7 UPS Reset Procedures after EPO
After shutting down the UPS through EPO or reasons of inverter overtemperature, overload, battery overvoltage and DC bus
voltage, clear the fault according to the alarm message displaying on TOUCHSCREEN 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 (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 Normal Mode to Bypass
Mode .
N O T E: T he rectifier will start autom atically w hen the overtem peratu re fault disappears five m inutes
after the disap pearance 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 A RN IN G! If the m aintenance bypass sw itch Q3 is closed and the U PS has input power, it
m eans U P S has outputs.
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 Enabling 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: D uring the autom atic restart process, m anual startup is disabled. A utom atic restart m ust be
set b y Vertiv's authorized service engineer through V ertiv setting softw are.
6 Single UPS Operation Introduction
117
Vertiv™ Liebert® EXM2 UPS User Manual