ETP48400-C9A2 Embedded Power
User Manual
7 Maintenance
Issue 05 (2020-04-07)
Copyright © Huawei Technologies Co., Ltd.
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2.
Remove the SMU, reinstall it, and check whether the alarm is cleared. If the alarm still
exists, replace the SMU.
7.2.7 LLVD Disconnected
Possible Causes
An AC power failure has occurred.
Loads are manually disconnected.
The load disconnection voltage has been set to a very high value on the SMU.
Measures
1.
Check whether an AC power failure has occurred. If so, rectify the fault to restore the
AC power supply.
2.
Check whether loads are manually disconnected. If so, check with other maintenance
personnel whether the loads can be reconnected.
3.
Check whether the load disconnection voltage (44 V DC by default) has been set to a
very high value on the SMU. If so, adjust it to a normal value.
7.2.8 BLVD Disconnected
Possible Causes
An AC power failure has occurred.
Batteries are manually disconnected.
The battery disconnection voltage has been set to a very high value on the SMU.
Measures
1.
Check whether an AC power failure has occurred. If so, rectify the fault to restore the
AC power supply.
2.
Check whether batteries are manually disconnected. If so, check with other maintenance
personnel whether the batteries can be reconnected.
3.
Check whether the battery disconnection voltage (43 V DC by default) has been set to a
very high value on the SMU. If so, adjust it to a normal value.
7.2.9 Batt Loop Trip
Possible Causes
The battery circuit breaker or fuse detection cable is loosely connected.
The battery circuit breaker has tripped or the battery fuse has blown.
The contactor is faulty.
Measures
1.
Check whether the battery circuit breaker or fuse detection cable is loosely connected. If
so, reconnect the cable.
2.
Check whether the battery circuit breaker has tripped or the battery fuse has blown. If so,
rectify the battery loop fault and then switch on the circuit breaker or replace the fuse.
