2330 fault in ABB DCS880 drive indicates Residual current detected. This means the drive has detected an unbalance typically due to a residual current in the motor or the motor cables.

1. Check the settings of 31.17 Residual current detection source, 31.18 Residual current detection type, 31.19 Residual current detection level and 31.20 Residual current detection delay.
2. Check the residual current transformer, if necessary change transformer or connected drive hardware.
3. Check the insulation resistances of motor and motor cables. Disconnect the mains, verify safe isolation from supply in armature and field circuits and make insulation tests for the complete installation.