Rectifying Common Faults; Ac Power Failure; Ac Overvoltage - Huawei DPU40D-N06A3 User Manual

DPU40D-N06A3, DBU20B-N12A3, and
DBU50B-N12A1 Distributed Power System
User Manual
No.
5
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5.2 Rectifying Common Faults

5.2.1 AC Power Failure

Possible Causes



Solution
1.
2.
3.

5.2.2 AC Overvoltage

Possible Causes


Solution
1.
Issue 04 (2020-02-29)
Item
Check whether
cables overheat or
deteriorate.
Check whether
cables are squeezed
and distorted by
metal parts.
Check whether
cables and wiring
terminals are intact.
 Determine alarm handling measures based on the blinking frequency of the indicator. If the indicator
blinks at 4 Hz, replace the module. If the indicator blinks at 0.5 Hz, rectify the fault onsite.
 This method applies to scenarios with the NMS.
The mains power fails.
The AC input circuit breaker is OFF.
The AC input power cable is loose.
Measure the AC input voltage. If the voltage is abnormal, rectify the power grid fault.
Check whether the AC input circuit breaker is OFF. If yes, rectify the back-end circuit
fault and switch on the circuit breaker.
Check whether the AC input power cable is loose. If yes, secure the input power cable.
The grid power is unstable.
The AC overvoltage alarm threshold is incorrectly set.
Measure the AC input voltage. If the voltage is abnormal, rectify the power grid fault.
Copyright © Huawei Technologies Co., Ltd.
Possible Fault
Cause
Cables are not
properly installed.
Cables are not
properly installed.
They are damaged.
5 Maintenance
Suggestion
Replace cables and
optimize the cable
routing.
Replace cables and
optimize the cable
routing.
Replace the cables
or wiring terminals.
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