Encoder Loss

What does 91 mean?

Requires a differential encoder. One of the two encoder channel signals (e.g., A or B) is missing. This indicates a problem with the encoder feedback, which is critical for precise motor control, leading to loss of speed or position regulation.

• Encoder cable disconnected or damaged.
• Encoder power supply failure (e.g., 24VDC).
• Faulty encoder module.
• Interference on encoder feedback lines.

Click steps to track your progress.

1. 1

   Verify encoder wiring for continuity and proper connections at the drive's encoder input terminals.

2. 2

   Replace the encoder unit.