Vertiv EXM 0080kTK16FN01000, User Manual

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82 Chapter 5 UPS Operation Introduction
Liebert EXM 80kVA ~ 200kVA UPS User Manual
Caution
The following procedures will cut off the load power, making the load completely power off.
1. Click the INVERTER OFF key to stop the operation of the inverter (Refer to Section 4.3.3). 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.
Warning
1. Post a label at the AC input distribution (generally far away from the UPS) to alert that the UPS maintenance is
being operated.
2. Wait 10 minutes for the internal DC bus capacitance discharging. Then the UPS is completely shut down.
Warning: hazardous battery voltage
The battery terminals still have hazardous voltage after the UPS is completely shut down.
5.5.2 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
5.3.4 Transfer From Normal Mode To Maintenance Mode .
5.6 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.
5.7 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 Section 4.3.3), 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 Section 5.3.2.
Note
The rectifier will start automatically when the overtemperature fault disappears five minutes after the disappearance