TP48200A-HT19C3 and TP48200A-HT19C4 Telecom
Power
User Manual
4 Maintenance
Issue 03 (2019-11-15)
Copyright © Huawei Technologies Co., Ltd.
48
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.
Measures
1.
Check whether an AC power failure has occurred. If so, rectify the fault to restore the
AC power supply.
2.
Check whether the DC undervoltage alarm threshold (45 V DC by default) is correctly
set. If not, set the threshold to the correct value.
3.
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.
4.
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.
5.
Check whether faulty rectifiers have resulted in insufficient power system capacity for
the loads. If so, replace the faulty rectifiers.
4.2.6 Batt Chg. Overcur.
Possible Causes
Rectifier communication is interrupted.
SMU connections are loose.
The SMU is faulty.
Measures
1.
Check whether an alarm has been generated for interrupted rectifier communication. If
so, remove the rectifier, reinstall it, and check whether the alarm is cleared. If the alarm
still exists, replace the rectifier.
2.
Remove the SMU, reinstall it, and check whether the alarm is cleared. If the alarm still
exists, replace the SMU.
4.2.7 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.
