Cause : Option fault comes when the inverter trips when a contact fault is found between the inverter and the plug-in option, or when the communication option is not connected to the connector 1.

Appears when the switch for manufacturer setting of the plug-in option is changed.

1. Check that the plug-in option is plugged into the connector properly.
2. Check for excessive noise around the inverter.
3. Check if the communication option is connected to the connector 2 or 3.
4. Connect the plug-in option securely.
5. Connect the communication option to the connector 1.