Dc Over Volt; Dc Under Volt; Amb. Over Temp - Huawei ETP4830-A1 User Manual

ETP4830-A1 Embedded Power
User Manual

7.2.4 DC Over Volt

Possible Causes
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Measures
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7.2.5 DC Under Volt

Possible Causes
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Measures
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7.2.6 Amb. Over Temp

Possible Causes
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Issue 10 (2017-08-08)
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.
The DC undervoltage alarm threshold is incorrectly set on the SMU.
The system configuration is incorrect.
The power system voltage has been manually set to a very low value.
Rectifiers are faulty.
Check whether an AC power failure has occurred. If so, rectify the fault to restore the
AC power supply.
Check whether the DC undervoltage alarm threshold (45 V DC by default) is correctly
set. If not, set the threshold to the correct value.
Check whether the load current is greater than the present power system capacity. If so,
expand the power system capacity or reduce the load power.
Check whether the system voltage has been manually set to a very low value. If so,
check with other maintenance personnel whether the voltage can be changed to a normal
value.
Check whether faulty rectifiers have resulted in insufficient power system capacity for
the loads. If so, replace the faulty rectifiers.
This alarm is generated only for the power system that has ambient temperature sensors installed.
The ambient overtemperature alarm threshold is not set properly on the SMU.
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