TP48200A-D17B3
Troubleshooting Guide
4 Troubleshooting
Issue 03 (2013-05-06)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
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4.3 Alarm Handling
4.3.1 AC Phase Loss
Possible Causes
The AC input cable is faulty.
The mains supply or D.G. is faulty.
Solution
Step 1
Check that the AC input cable is properly connected. Replace the cable if its insulation coat is
aged.
Step 2
Check whether the AC input voltage is excessively low using a multimeter or whether an AC
undervoltage (lower than 60 V AC) alarm is generated. If the AC input voltage is excessively
low or an AC undervoltage alarm is generated, check the AC input route for short circuits or
electric leakage. If short circuits or electric leakage occurs, replace the cable.
Step 3
If the AC input is the mains supply, contact the mains supplier for troubleshooting. If the AC
input is from the D.G., check the D.G. by referring to the diesel generator user manual.
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4.3.2 AC Power Off
Possible Causes
The AC input cable is faulty.
The mains supply or D.G. is faulty.
Solution
Step 1
Check that the DC input cable is properly connected.
Step 2
Check whether there is AC input.
If there is AC input, check whether the AC detection cable is properly connected. If the AC
detection cable is properly connected, replace the AC detection board.
If there is no AC input, check the AC input route for short circuits, open circuits, or other
faults. If the AC input route is in good condition, contact the mains supplier for
troubleshooting if the AC input is from the mains supply. If the AC input is from the D.G.,
check the D.G. by referring to the diesel generator user manual.
Step 3
If the power-off duration is short, supply DC power using batteries. If the power-off duration
is long, switch to another power supply system.
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