Huawei DPU40D-N06A3 - Communication Failure; Rectifier Fault; Rectifier Power Failure

DPU40D-N06A3, DBU20B-N12A3, and
DBU50B-N12A1 Distributed Power System
User Manual
5 Maintenance
Issue 04 (2020-02-29)
Copyright © Huawei Technologies Co., Ltd.
35

The parallel power cable between rectifiers is loose.
Solution
Check whether the parallel communications or power cable between rectifiers is loose. If so,
secure the cable.
5.2.7 Communication Failure
Possible Causes
The rectifier communications cable is loose.
Solution
Check whether the rectifier communications cable is loose. If so, secure the cable.
5.2.8 Rectifier Fault
Possible Causes

The parallel power cable is loose.

The rectifier hardware is damaged.

The rectifier experiences external overvoltage.
Solution
1. Check whether the parallel power cable between rectifiers is loose. If so, secure the
cable.
2. Check whether the system output voltage is excessively high. If so, disconnect the
parallel cable, check the output voltage of each rectifier, locate the rectifier with
abnormally high output voltage, and replace it.
5.2.9 Rectifier Power Failure
Possible Causes

The upstream input circuit breaker for the rectifier is OFF.

The upstream input circuit breaker for the rectifier is incorrectly configured.
Solution
1. Check whether an input cable and terminal is short-circuited. If so, switch off the
upstream input circuit breaker, rectify the fault, and switch on the circuit breaker.
2. Check whether the upstream input circuit breaker for the rectifier has the appropriate
capacity. If not, replace the circuit breaker.