Cause : External scale disconnection error comes when the external scale is disconnected, or the scale fails. This external device is often used for precise position feedback, and its absence can significantly impact the servo system's performance.

"alarm 35" in panasonic servo drive indicate "External scale disconnection" error. This means the drive has detected a loss of connection with the external scale (or encoder). This error suggests that the drive is not receiving any feedback from the external scale, which is crucial for accurate positioning and motion control.

1. Check the power supply for the external scale.
2. Correct the wiring and SIG connections per the wiring diagram.