Chapter 5 Operating Instructions 43
Liebert APM 90 Integrated Modular UPS User Manual
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 UPS input switch should be opened.
5.9
UPS Reset Procedures
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 switch 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.
5.10
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 end of EOD threshold, it will shut down.
The UPS will automatically restart and enable output power:
After the mains power is restored
If Auto Recovery after EOD Enabling is enabled
After the Auto Recovery after EOD Delay Time expires (the default delay is 10min). during the
automatic recovery delay, the UPS will charge its batteries to provide a safety margin for equipment
shutdown if input power fails again
If the Auto Recovery after EOD Enabling feature is disabled, the user may restart the UPS manually by pressing
the FAULT CLEAR button.
5.11
Selecting Language
The UPS provides two LCD languages for your selection: Chinese and English.
Carry out the following procedures to select the language:
1. From the OutPut menu, press the F3 or F4 (left or right) key as needed to select the Language menu.
2. Press the F5 (enter) key to move the cursor to the data window on the screen.
3. Use the F3 or F4 (up or down) key to select the required language.
4. Press the F5 (enter) key to accept the language selection.
5. Return to the OutPut menu by repeatedly pressing the F2 (ESC) key as needed; all text on the LCD will now
be displayed in the selected language.
