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Protection - Isolation Err. - Insulation resistance low

Fault Description / Instruction: Check wires of PV and ground:

  1. Turn OFF AC switch to disconnect from grid
  2. Open fuse holders to isolate PV strings. Test strings with string test set.
  3. Add one PV string at a time, and start up inverter to see if alarm occurs.
  4. If no alarm turn OFF AC switches to disconnect from grid and add the next string. Turn AC switch on and start up inverter again
  5. Continue until you can find the string that triggers the alarm. Trace back the faulted string to find any leakage to Earth Ground.
  6. The parameter "ISOResist" in hidden menu can be adjusted

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