Rectifying Common Faults; Ac Failure; Ac Over Volt; Ac Under Volt - Huawei ETP48400-C9A2 User Manual

ETP48400-C9A2 Embedded Power
User Manual

7.2 Rectifying Common Faults

7.2.1 AC Failure

Possible Causes
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Measures
1.
2.
3.

7.2.2 AC Over Volt

Possible Causes
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Measures
1.
2.

7.2.3 AC Under Volt

Possible Causes
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Measures
1.
2.

7.2.4 DC Over Volt

Possible Causes
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Issue 05 (2020-04-07)
The AC input power cable is faulty.
The AC input circuit breaker is OFF.
The power grid is faulty.
Check whether the AC input cable is loose. If so, secure the AC input cable.
Check whether the AC input circuit breaker is OFF. If so, handle the fault which caused
the AC input circuit breaker to turn OFF and then switch on the circuit breaker.
Check whether the AC input voltage is lower than 50 V AC. If so, handle the power grid
fault.
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.
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