ILLEGAL MACHINE POS.(SV)

What does SV0477 mean?

The servo detected that the machine position on the axis is not within the safety area (parameter No.13831 to 13838) during safety monitoring (when the safety check request signal (*VLDVx) is 0). This indicates the axis moved outside its defined safe operating envelope after the machine reference position was established, which can lead to collisions or unsafe conditions.

• Machine reached an unexpected position due to external forces or incorrect command.
• Axis limit switch triggered unexpectedly during movement.
• Following error too large, exceeding P1-54.
• Incorrect homing sequence or lost position reference.

Click steps to track your progress.

1. 1

   Confirm that parameters No.13831 to 13838 define the correct safety area for the machine.

2. 2

   Verify that the axis operation program ensures movement is performed within the established safety area.

3. 3

   Ensure the machine reference position has been correctly established for the affected axis.