●
The AC input and slot connector are normal, but the Fault indicator (red) is
steady on or all indicators are off.
●
The slot connector and SMU are normal, but the Alarm indicator (yellow) still
blinks after the rectifier is reinstalled.
●
The AC input and SMU are normal, but the SMU cannot control the rectifier.
7.4.2 Identifying SMU Faults
The following indicate that the SMU is faulty:
●
The DC output is normal but the green indicator on the SMU is off.
●
The SMU has an obvious fault, such as crash-down or no response after
startup.
●
With alarm reporting enabled, the SMU does not report alarms when the
power system is faulty.
●
The SMU reports an alarm when the power system is not faulty.
●
The SMU fails to communicate with the connected lower-level devices even
though the communications cables are correctly connected.
●
Communication between the SMU and all rectifiers fails even though the
rectifiers and the communications cables are normal.
●
The SMU cannot monitor AC or DC power distribution when communications
cables are intact and AC and DC power distribution is normal.
●
Parameters cannot be set or running information cannot be viewed on the
SMU.
7.4.3 Identifying Circuit Breaker Faults
If the load fuse is blown, it indicates that the circuit breaker trips. If the circuit
breaker is switched on and the downstream device is still not powered (the busbar
has power), the circuit breaker is faulty and needs to be replaced.
7.5 Replacing Components
NO TICE
● Performing maintenance or replacing components may interrupt power to the
loads if battery reserve is insufficient. Ensure that the switches for primary
loads are in the ON position and do not turn off the battery switch and the AC
input switch at the same time.
● Obtain prior written consent from the customer if load disconnection is
required.
● Do not perform maintenance on rainy days. Otherwise, rain water can enter
the system and damage devices and components.
ETP4860-B1A2 Embedded Power
User Manual
7 Maintenance
Issue 04 (2021-01-05)
Copyright © Huawei Technologies Co., Ltd.
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