Huawei UPS5000-A-400 kVA User Manual page 187

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