TP48200E-H12C1 (Nepal, Ncell)
User Manual
4 Maintenance
Issue 01 (2015-05-05)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
18
Maintenan
ce Item
Maintenance Task
Check That…
By…
If…
Do…
Preventive
maintenance
Indicators are
normal.
Observing
An alarm is
generated.
Appearance
The paint or the
electroplated
coating on the
cabinet does not
flake off and is
not scratched.
Observing
The cabinet is
damaged or
deformed.
Repaint and repair
the enclosure.
4.2 Rectifying Common Faults
4.2.1 AC Failure
Possible Causes
The AC input power cable is faulty.
The AC input circuit breaker is OFF.
The mains grid is faulty.
Measures
1.
Check whether the AC input cable is loose. If yes, secure the AC input cable.
2.
Check whether the AC input circuit breaker is OFF. If yes, handle the back-end circuit
failure and then switch on the circuit breaker.
3.
Check whether the AC input voltage is lower than 50 V AC. If yes, handle the mains
grid fault.
4.2.2 AC Over Volt
Possible Causes
The AC overvoltage alarm threshold is not set properly on the SMU.
The power grid is faulty.
Measures
1.
Check whether the AC overvoltage alarm threshold is properly set. If no, adjust it to a
proper value.
2.
Check whether the AC input voltage exceeds the AC overvoltage alarm threshold (280 V
AC by default). If yes, handle the AC input fault.