Ac Over Volt; Ac Under Volt; Ac Phase Failure; Dc Over Volt - Huawei TP48200A-DT19D1 Telecom Power User Manual

TP48200A-DT19D1 Telecom Power
User Manual

4.2.2 AC Over Volt

Possible Causes
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
Measures
1.
2.

4.2.3 AC Under Volt

Possible Causes
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
Measures
1.
2.

4.2.4 AC Phase Failure

Possible Causes
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

Measures
1.
2.
3.
4.

4.2.5 DC Over Volt

Possible Causes

Issue 03 (2019-11-15)
The AC overvoltage alarm threshold is incorrectly set on the SMU.
The power grid is faulty.
Check whether the AC overvoltage alarm threshold is correctly set. If not, set the
threshold to the correct value.
Check whether the AC input voltage exceeds the AC overvoltage alarm threshold (280 V
AC by default). If so, handle the AC input fault.
The AC undervoltage alarm threshold is incorrectly set on the SMU.
The power grid is faulty.
Check whether the AC undervoltage alarm threshold is correctly set. If not, set the
threshold to the correct value.
Check whether the AC input voltage is below the AC undervoltage alarm threshold (180
V AC by default). If so, handle the AC input fault.
The AC input power cable is faulty.
Rectifier connections are loose.
The SMU is faulty.
Check whether the AC input power cable is correctly and securely installed. If not,
reinstall the cable. If the insulation layer of the cable is damaged, replace the cable.
Check whether a short circuit exists in the AC input power cable or the insulation layer is
damaged. If so, replace the cable.
If the AC input is normal and the Alarm indicators on certain rectifiers are steady yellow,
reinstall the rectifiers.
If the alarm persists, replace the SMU.
The DC overvoltage alarm threshold is incorrectly set on the SMU.
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