Vertiv | Liebert EXS 80kVA UPS | User Manual
65
UPS Operating Instructions
5.7. EPO
The REPO is designed to switch off the UPS under emergency conditions (such as fire, flood). To perform EPO,
you just need to unplug the EPO terminal, 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 REPO, if the mains input is present, the UPS control circuit will remain active; however, the output is
interrupted.
To completely remove all mains power from the UPS, open the main input switch Q1, bypass input switch Q2,
output switch Q5 and N line switch QN in turn, and then open the battery terminals.
5.8. UPS Reset Procedures After EPO
After the UPS has been shut down through EPO or due to inverter overtemperature, overload, battery
overvoltage and DC bus voltage, clear the fault according to the alarm message displayed on the LCD screen.
Then carry out the following reset procedures to normalize the UPS operation.
After confirming the fault has been cleared, just plug the EPO terminal, and the user can perform the following
procedures:
1.
Access the main menu screen (see
or
key to select the ‘Control’ page, see
. Click the ‘Clear faults’ button, and press
key to make the system exit the REPO/abnormal OFF state,
and the alarm indicator in red color is turned off.
Figure 5-11 Control Page
2.
Press the power button to start the inverter. After the inverter runs normally, the UPS will be transferred
from Bypass mode to Normal mode, and the run indicator (green) will be solid on. Now the UPS restore is
complete.
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