UPS5000-A-400 kVA
User Manual (50 kVA, PF=0.9)
7 Troubleshooting
Issue 03 (2020-01-10)
Copyright © Huawei Technologies Co., Ltd.
179
Case
Symptom
Possible Cause
Measure
PFC soft-startup fails.
Replace the power unit.
The power unit is faulty.
The
inverter is
not normal.
The buzzer is activated, the
Fault indicator is on, the
inverter is faulty, and the
UPS transfers to bypass
mode.
The load is overloaded or
short-circuited.
Reduce load or rectify short
circuits.
Inverter overtemperature
occurs.
Install more air conditioners
or ventilation devices to
ensure normal temperatures
inside the equipment room.
The power unit is faulty.
Replace the power unit.
The charger
generate an
alarm.
The buzzer is activated, the
Fault indicator is on, and the
charging function fails.
The charger fails.
Replace the power unit.
The charger experiences
overcurrent.
The charger experiences
undervoltage.
Check whether the configured
number of batteries is correct.
If the value is correct but the
alarm persists, replace the
power unit.
The UPS
works in
bypass
mode and
does not
transfer to
inverter
mode.
When the mains is normal,
the UPS works in bypass
mode and does not transfer
to inverter mode.
Set the UPS working mode to
ECO mode.
Set the working mode
correctly.
The bypass transfer times
reach the upper threshold.
Clear the bypass transfer
times on the LCD.
The bypass
is not
normal.
The buzzer is activated, and
the Fault indicator is on.
The bypass thyristor is
damaged.
Replace the bypass unit.
The bypass unit experiences
overtemperature.
Reduce the load, or improve
ventilation.
For details about component replacement and maintenance involved in Troubleshooting and Alarm List,
consult Huawei maintenance engineers.