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Fault Name Fault Cause Fault Level Corrective Method
Soft start fault
The inverter fails
to start.
Important
Check whether the power grid is
abnormal, such as harmonics
and voltage balance.
DC SPD fault
The DC side SPD
of the inverter fails.
Important
Check the status indicator of the
SPD.
1. If the indicator changes from
green to red, the SPD is dam-
aged. It may be caused by local
thunderstorms. Measure the AC
and DC voltage and current. If
voltages between the positive
and negative poles to the ground
are normal, replace the SPD.
2. If the indicator is normal, the
SPD may be in poor contact with
its holder. Replug the SPD and
tighten it.
AC SPD fault
The AC side SPD
of the inverter fails.
Important
1. Refer to the troubleshooting
method of "DC SPD fault" to con-
duct preliminary troubleshooting.
2. Check whether the miniature
circuit breaker is connected in
series with the SPD trips.
3. If not, measure the AC and
DC voltage and current. Ensure
that there is no exception, and
close the miniature circuit break-
er again.
System Manual 10 Troubleshooting
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