69
Fault Name Fault Cause Fault Level Corrective Method
Module over-
temperature
The temperature
of modules inside
the inverter is ex-
cessively high.
Important
1. Check the air inlet.
2. Check whether the air outlet
of the inverter is blocked. Re-
place the air filter screen if
necessary.
3. Check whether the cooling fan
is running during the operation of
the inverter.
Fan/
Fan 2
exception
Fan/fan 2 inside
the inverter fails.
Important
1. Check whether the grid volt-
age is normal. Use a multimeter
to measure the grid voltage and
check for phase loss.
2. Check whether the power sup-
ply of the cooling fan is normal.
Use a multimeter to measure the
three-phase power supply to en-
sure that the rated input voltage
is 400 Vac.
Grounding fault
A grounding fault
occurs.
Important
1 Check the DC cables.
Check whether the positive
grounding cable of each DC
branch is damaged.
Check whether the DC cable re-
sistance to the ground is normal.
2 Check AC cables.
Measure the three-phase volt-
age to ground and observe
whether the voltage value is the
same. Check the inverter and
the box-type substation side
SPD for damage.
System Manual 10 Troubleshooting
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