Chapter 5 Operating Instructions 43
APM 300 Integrated UPS Single Module And Parallel System User Manual
5.6.2
Procedures For Completely Powering Down UPS While Maintaining Power To Load
Caution
Ensure that the UPS has been installed with an external maintenance bypass cabinet before carrying out these
procedures.
The following procedures are applicable for completely powering down the UPS and still keeping the power
supply to the load. In a parallel system, perform each step of the procedures in every UPS module before
proceeding to the next step.
1. Use the procedures in
5.3.4 Transfer From Normal Mode To Maintenance Mode
to transfer the UPS to
maintenance mode.
2. Close the maintenance bypass switch of the external maintenance bypass cabinet.
3. Open the rectifier input switch and bypass input switch of the UPS.
4. Open the output switch of the UPS.
5.7
EPO Procedures
The EPO key on the UPS operator control and display panel is designed to switch off the UPS in emergency
conditions, for example, fire, flood, and so on. The system will turn off the rectifiers, inverters and stop
powering the load immediately (including the inverters and bypass), and the battery stops charging or
discharging.
If the mains input is present, the UPS control circuit will remain active; however, the output will be turned off.
To remove all power from the UPS, the rectifier input switch, bypass input switch of the UPS should be
opened.
5.8
UPS Reset Procedures After EPO
After UPS shutdown due to an EPO action, inverter over-temperature or overload, battery overvoltage,
excessive transfer, and so on, once all appropriate measures have been taken to correct the problem indicated
by the alarm message appearing on the LCD, carry out the following reset procedures to restore the UPS to
normal operation
1. Press the FAULT CLEAR key to let the system exit the emergency off state.
2. Press and hold the INVERTER ON key for two seconds.
Note
1. The rectifiers will start again, and the bypass will begin to power the load. The Rectifier indicator flashes while the
rectifiers are starting up. When the rectifiers enter the normal operation state (about 30 seconds), the rectifier indicator
turns solid green.
2. The rectifiers will turn on automatically when the overtemperature fault disappears five minutes after the
disappearance of overtemperature signals.
3. After the EPO key is pressed, if the mains input is removed, 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.
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