Position initialization error at system start

What does 4465 mean?

During the initial system start-up, the set position could not be successfully initialized for all trials (with/without overflow/underflow) within the final position minimum and maximum limits. This means the axis could not establish a valid initial position, preventing it from becoming referenced and ready for motion.

• Faulty or inconsistent signal from the homing switch (e.g., X4-1, Home Sensor Input), preventing accurate determination of the reference position.
• Incorrect homing offset parameter (e.g., P4-05, Homing Offset) causing the final position to be outside the allowed min/max range after initialization.
• Encoder feedback issue (e.g., intermittent signal, noise, or partial damage) resulting in inaccurate position readings during initialization.
• Absolute position limits (e.g., P3-04 Min, P3-05 Max) are set too tightly, not allowing for the expected range of travel during initialization.
• Inaccurate or drifting motor/load mechanical coupling, causing the actual position to be different from what the homing procedure expects.

Click steps to track your progress.

1. 1

   1. Verify the functionality of the homing switch (e.g., by manually activating it) and check its input status via diagnostic D-07.

2. 2

   2. Review and adjust the homing offset parameter (P4-05) to ensure the axis initializes within the absolute position limits (P3-04, P3-05).

3. 3

   3. Check the encoder signal quality (e.g., A/B phase signals on X3-1, X3-2) with an oscilloscope for noise or dropouts during axis movement.

4. 4

   4. Expand the configured absolute position limits (P3-04, P3-05) slightly to provide more tolerance during the initial position setting.

5. 5

   5. Inspect the mechanical coupling between the motor and the load for any play or slippage that could affect homing repeatability.