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7. Trouble Shooting
This section describes how to find the troubles when UPS is abnormal. We suggest you to follow the
service procedure below:
1. Check the UPS status via LED and LCD display, the sound of the buzzer, or listen to the
description of end users.
2. Inspect failure board for static checking.
3. Replace failure components.
4. Static checking.
5. Power-on checking.
6. Test after repair.
Following section will help service person to solve the most problems.
7.1 LCD Panel Display Pattern Definition
7.1.1 Trouble shooting for warning icon in LCD display
Any warning display implies some abnormity happened to the UPS, indicating that some situation that
may endanger the reliability of the UPS has occurred, but these situations don’t immediately lead to
interruption of power supply.
LCD icon (Flashing)
Alarm
Possible cause
Action
1 Beeping / second
Low battery
Check the battery voltage
2 Beeping / second
Over load
Check the loads
1 Beeping / second
Battery disconnected
Check the battery wiring
1 Beeping / second
Battery/Charger voltage too high
Check the output voltage of the
battery and the charger
1 Beeping / second
EPO plug or cable not connected
Check the EPO plug and EPO cable
1 Beeping / second
Fan failure, or high internal
temperature
Check the fans, loads, ventilation,
ambient temperature
1 Beeping / second
Charger broken or low output
voltage
Check the charger
1 Beeping / second
I/P fuse broken
Check the I/P fuse
1 Beeping / second
Overload 3 times in 30min
Check the loads
Note:
When the UPS alarms, the UPS is still working on the original mode.
