Er.922 fault in inovance IS650 servo drive indicates Resistance of external braking resistor too small. This means an external regenerative resistor is used (H02-25 = 1 or 2), resistance of the external regenerative resistor is smaller than minimum value required by servo drive.

1. Measure resistance of the external regenerative resistor between P and C and check whether it is smaller than H02-21 (allowed minimum value of regenerative resistor).