Cause : Emergency ramp failed comes when emergency stop did not finish within expected time. The fault code 73B0 in your ABB ACS880 drive indicates an emergency ramp failed condition. This means the drive attempted to bring the motor to a stop using a predefined emergency deceleration ramp, but the motor failed to slow down within the expected time.

1. Check the settings of parameters 31.32 Emergency ramp supervision and 31.33 Emergency ramp supervision delay.
2. Check the predefined ramp times (23.19 for mode Off1, 23.23 for mode Off3).