Cause : FDBK SIGNAL NOISE FL- Feedback Signal Noise Fault comes when noise induced A/B channel state changes (illegal states) from a feedback device were detected by the drive. Specifically, the number of these noise events that have occurred on this channel has exceeded the Feedback Noise Factory Limit. The offending feedback channel number is encoded in the associated Fault/Alarm Sub Code.

• Check motor feedback cable and connector.
• Cycle power.
• Check feedback shield connection.
• Reduce shock and vibration to motor.
• Replace motor if fault continues.
• Verify all HTL/TTL DIP switches on the 25-ENC-2/B encoder are set in the same position.