17
2
Symptom
Possible Cause
Measure
The mains switch is ON. The
LCD does not display
anything. The system does
not perform self-tests.
The input power supply
is not connected.
The input voltage
exceeds the limit.
Check the input power cable connection.
Use a multimeter to check that the UPS
input voltage meets specifications.
The mains is normal, but the
AC input indicator is off. The
UPS runs in battery mode.
The mains switch is OFF.
The input power cable is
not securely connected.
Turn on the mains switch.
Check the input power cable connection.
The UPS does not report
faults, but has no output
voltage.
The output power cable
is not securely
connected.
Check the output power cable connection.
The UPS does not start after
you press .
is not pressed long
enough.
Overload occurs.
Press for more than 5 seconds until
you hear a beep sound.
Disconnect all loads, and restart the UPS.
The Mains indicator is off.
The mains voltage or
frequency exceeds the
UPS input range.
Use a multimeter to check that the input
voltage and frequency meet specifications.
The battery discharge time is
much less than the standard
time.
Batteries are not fully
charged.
The battery performance
deteriorates.
Charge batteries for more than 8 hours
when the mains is normal. Test the
discharge time again.
Contact local Huawei technical support
to replace batteries.
Abnormal noises or smell is
generated in the UPS
cabinet.
The UPS is faulty.
Shut down the UPS immediately and cut
off the input power supply. Contact local
Huawei technical support.
The battery indicator is
blinking yellow. The buzzer
buzzes 1 second and then
stops 1 second. The battery
capacity is insufficient. The
UPS is shutting down.
The remaining battery
capacity is insufficient.
The UPS is shutting
down, and the loads are
powering off.
Save load data immediately and power
off critical loads.
Connect UPS input terminals to the
backup AC power supply.
Troubleshooting
