TP48200E-H12C1 (Nepal, Ncell)
User Manual
4 Maintenance
Issue 01 (2015-05-05)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
20
4.2.6 DC Under Volt
Possible Causes
An AC power failure occurs.
The DC undervoltage alarm threshold is not set properly on the SMU.
The system configuration is not proper.
The power system voltage is set too low in manual mode.
Rectifiers are faulty.
Measures
1.
Check whether an AC power failure occurs. If yes, resume the AC power supply.
2.
Check whether the DC undervoltage alarm threshold (45 V DC by default) is properly
set. If no, adjust it to a proper value.
3.
Check whether the load current is greater than the current power system capacity. If yes,
expand the power system capacity or reduce the load power.
4.
Check whether the system voltage is set too low in manual mode. If yes, confirm the
reason and adjust the voltage to a proper value after the operation.
5.
Check whether the power system capacity is insufficient for the loads due to rectifier
failures. If yes, replace the faulty rectifier.
4.2.7 Batt Chg.Overcur.
Possible Causes
The rectifier communication is interrupted.
Poor contact of the SMU.
The SMU is faulty.
Measures
1.
Check whether an alarm is generated for rectifier communication interruption. If yes,
remove the rectifier and reinstall it to check whether the alarm is cleared. If the alarm
still exists, replace the rectifier.
2.
Remove the SMU and reinstall it to check whether the alarm is cleared. If the alarm still
exists, replace the SMU.
4.2.8 LLVD Disconnected
Possible Causes
An AC power failure occurs.
Loads are manually disconnected.
The load disconnection voltage is set too high on the SMU.
Rectifiers are faulty.
The system configuration is not proper.