Insulation fault has occurred and has been fixed

What does 3520 mean?

An insulation fault was detected but has since been rectified. This message serves as an informational warning that an insulation event occurred. No further corrective action is required if the fault has truly been fixed.

Click steps to track your progress.

1. 1

   Verify current insulation resistance (Riso) values for all connected PV strings against manufacturer specifications.

2. 2

   Inspect all DC cabling, PV module backsheets, junction boxes, and connectors for physical damage or signs of moisture ingress.

3. 3

   Review inverter historical event logs and operational data for the context and duration of the reported insulation fault.

4. 4

   Check the integrity of the grounding system for the PV array and inverter, ensuring all connections are secure.

5. 5

   Verify stable inverter operation and expected power output, monitoring for any recurrence of insulation-related warnings.