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Protection - IsolationErr - Insulation resistance low

Check wires of PV and ground:


  1.  Turn OFF AC switch to disconnect inverter from Grid.
  2.  Open fuse drawers to de-couple PV strings from each other. 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 there is no alarm, turn OFF AC switches to disconnect from Grid and add in the next string. Startup inverter again.
  5.  Continue until you can find the string that triggers the alarm. Trace wiring of faulted string to find any leakage to Earth Ground.
  6.  The parameter ISO Resist in hidden menu can be adjusted.

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