Encoder fault

What does 43 mean?

A problem has been detected with the encoder signals, such as missing channels (A or B), reversed direction, or a missing encoder board. This prevents accurate motor speed and position feedback, leading to unstable or incorrect motor control in closed-loop applications.

• Encoder feedback cable damage (e.g., broken conductor, short circuit, or shielding fault) leading to signal loss.
• Improper encoder wiring connections to the drive's encoder option board terminals (e.g., A/A- swapped, 5V/0V shorted).
• Mechanical damage to the encoder unit itself (e.g., bearing failure, disc misalignment, optical sensor failure).
• Incorrect encoder configuration parameters (e.g., P4-01 (Encoder type), P4-02 (Pulses per revolution)) not matching the installed encoder.
• Missing or faulty encoder option board in the drive slot.

Click steps to track your progress.

1. 1

   Visually inspect the encoder cable for any physical damage from the encoder to the drive.

2. 2

   Power down the drive and use a multimeter to check for continuity on each conductor of the encoder cable.

3. 3

   Verify all encoder feedback wires are correctly terminated at the drive's encoder option board (e.g., A, A-, B, B-, Z, Z-, 5V, 0V).

4. 4

   Check parameter P4-01 (Encoder type) and P4-02 (Pulses per revolution) to ensure they match the installed encoder's specifications.

5. 5

   Monitor encoder signals using the drive's diagnostic menu (e.g., P4-03 (Encoder speed feedback)) during slow motor rotation.

6. 6

   If available, swap the encoder option board with a known good one to rule out board failure.