Ac Under Volt; Dc Over Volt; Dc Under Volt - Huawei SMU01C User Manual

SMU01C
User Manual
Measures
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2.

9.5.3 AC Under Volt

Possible Causes
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Measures
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9.5.4 DC Over Volt

Possible Causes
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Measures
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9.5.5 DC Under Volt

Possible Causes
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Measures
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Issue 03 (2015-01-05)
Check the AC input voltage. If the AC input voltage exceeds the AC overvoltage alarm
threshold (280 V by default), rectify the AC input fault.
Adjust the AC overvoltage alarm threshold to a proper range.
The AC voltage exceeds the alarm threshold.
The AC undervoltage alarm threshold is not properly set on the monitoring unit.
Check the AC input voltage. If the AC input voltage under the AC undervoltage alarm
threshold (180 V by default), rectify the AC input fault.
Adjust the AC undervoltage alarm threshold to a proper range.
A rectifier is faulty.
The DC overvoltage alarm threshold is not properly set on the monitoring unit.
Check the Fault indicator on the rectifier. If the indicator is on, replace this rectifier
because it is subject to overvoltage.
Check the DC output voltage. If the DC output voltage (between the RTN+ busbar to the
–48 V copper bar) exceeds the DC overvoltage alarm threshold (58 V by default), rectify
the rectifier fault. Reset the rectifiers one by one and replace the faulty one.
Adjust the DC overvoltage alarm threshold to a proper range.
The AC power fails and storage batteries are discharging.
A rectifier is faulty.
The DC undervoltage alarm threshold is not properly set on the monitoring unit.
The alarm is automatically cleared after the AC input restores.
If the Fault indicator on a rectifier is steady on, replace the rectifier.
Adjust the DC undervoltage alarm threshold to a proper range.
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