Ac Over Volt; Ac Under Volt; Dc Over Volt; Dc Under Volt - Huawei TP48200A-HT19C4-1 User Manual

TP48200A-HT19C4-1 and TBC300A-TCA2 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 DC Over Volt

Possible Causes
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

Measures
1.
2.
3.

4.2.5 DC Under Volt

Possible Causes
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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 DC overvoltage alarm threshold is incorrectly set on the SMU.
The power system voltage has been manually set to a very high value.
Rectifiers are faulty.
Check whether the DC overvoltage alarm threshold (58 V DC by default) is correctly set.
If not, set the threshold to the correct value.
Check whether the system voltage has been manually set to a very high value. If so,
check with other maintenance personnel whether the voltage can be changed to a normal
value.
Remove the rectifiers one by one and check whether the alarm is cleared. If the alarm
still exists, reinstall the rectifier. If the alarm is cleared, replace the rectifier.
An AC power failure has occurred.
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