31 User Manual
4
A faulty grid relay
detected
The difference between INV
voltage and output voltage
exceeds limit.
1.
Disconnect the inverter from the utility grid and the PV array,
and reconnect it after LED turns off.
2.
If the fault persists, measure the phase to phase voltage and
phase to zero and zero to ground voltage with a multimeter to
ensure that the voltage is normal and the zero to ground
voltage value should not be greater than 10V.
3.
Disconnect the inverter from the utility grid and the PV array,
and reconnect it after LED turns off.
If this fault is still being displayed, please contact service.
5
PV voltage too high
When the PV voltage of any
circuit is greater than 1020V,
it is determined as the PV
voltage is too high.
Check the open-circuit voltages of the strings and make sure it is
below the maximum DC input voltage of the inverter. If the input
voltage lies within the permissible range while the fault occurs,
please contact the service.
6
Surface insulation
resistance error
In the process of power on
and start-up, the insulation
impedance of PV + and PV -
to ground is detected. When
the detection insulation
impedance is less than
200kohm, it is judged as
insulation fault.
1. If it happens occasionally, it may be caused by rainy or humid
environment. After the fault is eliminated, the inverter can resume
normal operation without other actions.
⒉If there is continuous alarm, please check the PV array’s
insulation to ground and make sure that the insulation resistance
to ground is greater than 200K
Ω. Otherwise, visual inspection of
all PV cables and modules. Make sure the grounding connection
of the inverter is reliable.
If all above are normal, please contact the service.
7
Ground fault circuit
interrupter (GFCI)
exceeds the
permissible range
residual current over the
permission range
⒈
Make sure the grounding connection of the inverter is reliable.
⒉
Make a visual inspection of all PV cables and modules.
If this fault is still shown, contact the service.
8
Inverter
temperature too
high
Heat sink and internal
environment temperature
higher than 85 degree
Please confirm:
⒈
Whether the airflow to the heat sink is obstructed.
⒉
Whether the installation site is in direct sunlight and ambient
temperature around the inverter is too high.
If all above is normal, contact the service.
