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Table 6-1 Troubleshooting
Case
Symptom
Possible Cause
Measure
The
rectifier is
not
normal.
The UPS rectifier
cannot work, and
the bus voltage is
not boosted.
The mains voltage
exceeds the upper
threshold 280 V or is
less than the lower
threshold 80 V.
Check whether the
mains voltage is
beyond the allowed
range. If so, contact
the electric power
company.
PFC soft-startup fails. Replace the power
module.
The power module is
faulty.
Replace the power
module.
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.
Output overload or
short-circuit exists.
Reduce the load or
troubleshoot the
short circuit.
The power module is
faulty.
Replace the power
module.
The
charger
generates
an alarm.
The buzzer buzzes,
the fault indicator is
on, and the charging
function fails.
The charger fails.
Replace the power
module.
The charger
experiences
overcurrent.
Replace the power
module.
The charger
experiences
undervoltage.
Check whether the
configured number
of batteries is
correct. If the setting
is correct but the
alarm persists,
replace the power
module.
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.
The UPS is set to
ECO mode.
Set the working
mode correctly.
The number of
bypass transfer times
reaches the upper
limit.
On the LCD, choose
Clear Faults.
The
bypass is
abnormal
.
The buzzer buzzes,
and the fault
indicator is on.
The bypass thyristor
is damaged.
Replace the bypass
module.
UPS5000-E-(30 kVA–120 kVA)-FM
User Manual
6 Troubleshooting
Issue 03 (2022-01-30)
Copyright © Huawei Technologies Co., Ltd.
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