Ground Fault / High Leakage Current / Residual Current

What does 3501/3601/3701 mean?

The inverter has detected a ground fault in the PV array (3501), or the leakage current of the inverter and PV array is too high (3601), or a residual current due to temporary grounding of the PV array has been detected (3701). These conditions indicate defective or insufficient electrical insulation from the PV system to ground, potentially from a ground fault, residual current, or a malfunction causing high leakage current. The inverter will interrupt feed-in operation.

• Ground fault in the PV array due to damaged insulation.
• Defective or insufficient electrical insulation from the PV system to ground.
• High leakage current in the inverter and/or PV array due to a malfunction or residual current from temporary grounding.

Click steps to track your progress.

1. 1

   Disconnect the inverter from all voltage sources (refer to the inverter installation manual).

2. 2

   Measure the voltage between the positive terminal and the ground potential (PE) of the PV array.

3. 3

   Measure the voltage between the negative terminal and the ground potential (PE) of the PV array.

4. 4

   Measure the voltage between the positive and negative terminals of the PV array.

5. 5

   If all measured voltages are stable AND the sum of the two voltages to ground potential is approximately equal to the voltage between the positive and negative terminals, a ground fault is present. Determine the location of the ground fault via the ratio of the two measured voltages and eliminate it.

6. 6

   If a definite ground fault cannot be measured by voltage, perform an insulation resistance measurement on the PV system using a measuring device with a DC input voltage range of 600 V or higher.