Huawei iSitePower - Identifying Circuit Breaker Faults; Locating AC Input Module Faults; ESM Troubleshooting

4.2.3 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.
4.2.4 Locating AC Input Module Faults
The AC input module faults are described as follows:
● The SMU LCD displays AC SPD fault.
● If the AC power supply is normal and the PSU has no output after the circuit
breaker is switched on (the upstream power supply is available), the circuit
breaker is faulty.
4.2.5 ESM Troubleshooting
Table 4-12 ESM troubleshooting
Fault Type Possible Cause Troubleshooting
High
temperature
alarm
The battery temperature
sensor detects that the ESM
temperature exceeds the
specied value.
Check whether the temperature sensor is located
in a high-temperature environment. If so,
determine the cause of abnormal temperature
near the sensor and rectify the fault.
Overvoltage or
undervoltage
alarm
The ESM voltage exceeds
the specied value.
1. Check whether the ESM is securely connected
to the system and whether the connector is
rusty or oxidized. If so, polish the corroded
layer.
2. Check that the connector is connected
properly. Secure any loose connector.
Short-time
battery
discharge or
unbalanced
discharge
current
Connections are loose. Check whether the charge and discharge loops of
each battery terminal are securely connected.
The power system
parameter settings are
incorrect.
Check whether the power system parameters are
correctly set.
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