MCU self-check: Abnormalness detected

Corrective Measures

A. Disconnect the inverter from the utility grid and the PV array

B. Reconnect it after LED turns off

C. If this fault is still being displayed, please contact the service.

AC current sensor detect current abnormal in the start process.

• • Disconnect the inverter from the utility grid and the PV array
  • Reconnect it after LED turns off

If this fault is still being displayed, please contact the service.

If it is unrecoverable, replace inverter

GFCI sensor self-check abnormal

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 the service.

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 the service.

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.
2. If 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 1 MΩ. 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.

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.
2. If 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 1 MΩ. 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.

Residual current out of permission value range.

1. Make sure the grounding connection of the inverter is reliable.
2. Make a visual inspection of all PV cables and modules.

If this fault is still shown, contact the service.

Heat sink and internal environment temperature higher than 85 degree.

Please confirm:

1. Whether the airflow to the heat sink is obstructed.
2. 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.

Inverter failed to detect a grid voltage.

If it happens occasionally, it belongs to the short-time abnormality of the power grid, the inverter will return to normal operation after detecting that the power grid is normal, and there is no need to deal with it. If it cannot be recovered for a long time, please confirm:

1. whether the AC circuit breaker is disconnected
2. whether the AC terminal or fuse is in good contact
3. whether the power supply line is normal

If this fault is still being shown, contact the service.

Grid voltage exceeds the stated range in accordance with Local Safety Regulations

If it happens occasionally, it belongs to the short-time abnormality of the power grid, the inverter will return to normal operation after detecting the normal power grid, and there is no need to deal with it.
In case of frequent occurrence but automatic recovery, please confirm if the grid voltage is outside the permissible range due to local grid conditions, try to modify the values of the monitored operational limits after informing the electric utility company first.
If it cannot be recovered for a long time, please confirm:

1. whether the AC circuit breaker is disconnected
2. whether the AC terminal is in good connection
3. whether the power supply line is normal
4. whether the AC cable wiring (such as wire length and wire diameter) complies with the user manual guidance