34 Chapter 4 UPS Operation Instructions
Liebert ITA 16kVA/20kVA User Manual
4.4 EPO Procedure
There is an EPO switch on the UPS operation and display panel. The EPO button is designed to switch off the UPS in
emergency conditions (such as fire, flood, and so on). The system will turn off the rectifier, inverter and stop powering
the load immediately (inverter and bypass included), 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 mains power from the UPS, the external input switch should be disconnected.
4.5 Auto Restart
When the mains power failure, the UPS draws power from the battery to supply the load until the batteries are
depleted. Then the UPS will shut down.
The UPS will automatically restart and recover output power:
z
After the mains power is restored.
z
The UPS Auto Restart function is enabled.
z
After the Auto Restart is delayed (default: 10 minutes). During the Auto Restart delay, the UPS will charge the
battery to provide a safety margin for equipment shutdown if input power fails again.
If the Auto Restart function is disabled, you can restart the UPS manually by pressing the FAULT CLEAR button.
4.6 UPS Reset Procedure
The EPO action or the following reasons such as inverter overtemperature, power-off overload, battery overvoltage
and excessive switching may result in the UPS power-off. Once all appropriate measures have been taken to correct
the problem indicated by the alarm message appearing on the LCD, you can carry out the following procedures to
restore the UPS to normal operation state.
1. Press the FAULT CLEAR button to make the system exit the EPO state.
2. Press the ON button for 2s.
Note
1. The rectifier restarts, and the bypass supplies power to the load. When the rectifier starts, the fault indicator flashes. When the
rectifier runs in normal operation (about 30 seconds later), the fault indicator will turn off.
2. 5 minutes after the overtemperature signal disappears, that is, when the overtemperature fault is eliminated, the rectifier will
automatically start.
3. After the EPO button is pressed, if the mains input is disconnected, the UPS will shut down completely. When the mains input is
available, the UPS will start and run in Bypass mode, and also the output is available.
4.7 Language Selection
The LCD menus are available in two languages: Chinese, English.
Procedures for selecting the language:
1. From the ‘AC Output’ menu, press F3 or F4 (left or right arrow) to select the ‘Language’ menu.
2. Press F5 (Enter) to move the cursor to the UPS Data Window of the LCD.
3. Use F3 and F4 (up and down arrows) to select the required language.
4. Press F5 (Enter) for confirmation.
5. Return to the ‘AC Output’ menu by repeatedly pressing F2 (ESC). At this point, all texts on the LCD will be
displayed in the selected language.
4.8 Changing Current Date And Time
Procedures for changing the system date and time:
