Huawei UPS5000-E Series Quick Manual page 18

10
Common Alarms and Troubleshooting Measures
Alarm Possible Cause
Mains ph. The mains input phase sequence
reversed is reversed.
Bypass ph. The bypass input phase
reversed sequence is reversed.
The ready switch is OFF.
Not ready
The ECM ejector lever is not
fastened.
Battery There is a battery with the lowest
overvoltage voltage in the battery string.
•
The UPS has worked in
Battery
battery mode for a long time.
undervoltage
•
The charger is faulty.
The mains voltage exceeds the
Mains voltage upper threshold or is below the
abnormal lower threshold, or the frequency
is abnormal.
Abnormal
The bypass voltage or frequency
bypass
is abnormal.
voltage
Emergency power-off is
EPO
performed.
Troubleshooting Measures
Verify that the mains input phase sequence is
correct using a phase sequence meter.
Verify that the bypass input phase sequence is
correct using a phase sequence meter.
Close the ready switch
module or power module.
1. Fasten the ECM ejector lever.
2. If the fault persists, replace the ECM.
Check whether battery strings are deteriorating.
1. Check whether the battery voltage is normal.
2. Check whether the output is overloaded.
3. Check whether any battery is damaged. If yes,
replace the battery.
4. Check whether a charger alarm is triggered. If
a charger is faulty, replace the related faulty
power module.
Check the mains input voltage and frequency.
•
Check the bypass input voltage, frequency,
and cable connections.
•
Check whether the output voltage level and
upper and lower thresholds of the bypass
voltage are properly set on the LCD. Check
whether the rated frequency and frequency
range are properly set.
Check the EPO button status. If this is caused by
mistake, restore the button and perform Clear
Fault on the LCD.
18
on the bypass