IG-AD Alarm

The IG-AD fault indicates a grid current sampling failure.  The failure is internal to the inverter and is not user-serviceable. Field technicians may attempt to troubleshoot by power cycling the inverter:

  1. Turn off AC power supply
  2. Turn off DC power supply.
  3. Wait 4-5 minutes to allow residual voltage to dissipate.
  4. Turn on AC power supply
  5. Turn on DC power supply.

If the IG-AD fault returns after the inverter turns back on, then it will need to be replaced.

Victor is the author of this solution article.

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