66
Fault Name Fault Cause Fault Level Corrective Method
Frequency fault
The grid fre-
quency is
abnormal.
Important
1 Check whether the protection
parameters on the interface
meet the grid standards of the lo-
cation where the inverter is
installed.
2 In the shutdown state, check
whether the grid frequency dis-
played on the inverter is consis-
tent with the actual value.
Islanding
protection
The power grid
fails or the AC in-
stantaneous volt-
age exceeds the
protection
threshold.
Important
1. Check the grid for any
exceptions.
2. Check whether a short circuit
occurs on the AC side of the
inverter.
3. Check whether the AC circuit
breaker of the inverters is
disconnected.
Control power
exception
The control power
is abnormal.
Important
1 Check whether the internal
and external power supply con-
trol switches of the inverter are
closed or disconnected at the
same time.
If they are closed at the same
time, please disconnect one of
the switches.
If they are disconnected at the
same time, please close one of
the switches.
2 Check whether the internal
and external power supply termi-
nals are loose or poorly con-
tacted. Tighten them if
necessary.
DC voltage
sampling fault
The DC voltage
sampling is
abnormal.
Important
In the shutdown state, check
whether the DC voltage dis-
played on the inverter is consis-
tent with the measured value.
10 Troubleshooting System Manual
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