Rectifying Common Faults; Mains Failure; Ac Over Volt; Ac Under Volt - Huawei ETP4830-A1 User Manual

ETP4830-A1
User Manual

7.2 Rectifying Common Faults

7.2.1 Mains 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 06 (2014-02-20)
The AC input power cable is faulty.
The upper-level AC input circuit breaker is OFF.
The mains grid is faulty.
Check whether the AC input cable is loose. If yes, secure the AC input cable.
Check whether the upper-level AC input circuit breaker is OFF. If yes, handle the
back-end circuit failure and then switch on the circuit breaker.
Check whether the AC input voltage is lower than 50 V AC. If yes, handle the mains
grid fault.
The AC overvoltage alarm threshold is not set properly on the SMU.
The power grid is faulty.
Check whether the AC overvoltage alarm threshold is properly set. If no, adjust it to a
proper value.
Check whether the AC input voltage exceeds the AC overvoltage alarm threshold (280 V
AC by default). If yes, handle the AC input fault.
The AC undervoltage alarm threshold is not set properly on the SMU.
The power grid is faulty.
Check whether the AC undervoltage alarm threshold is properly set. If no, adjust it to a
proper value.
Check whether the AC input voltage is below the AC undervoltage alarm threshold (180
V AC by default). If yes, handle the AC input fault.
The DC overvoltage alarm threshold is not set properly on the SMU.
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