Drives error Ax no.: 71

KSD Microcontroller Crash

Kuka · KR C2 Robot Controller

What does Drives error Ax no.: 71 mean?

The microcontroller within the servo drive module for the specified axis (Ax) has crashed. This indicates an internal hardware or firmware malfunction of the KSD.

Common Causes

  • Microcontroller on the KSD drive has crashed or is unresponsive.
  • Unexpected software exception or hardware fault.
  • Watchdog timer expired due to system unresponsiveness.
  • Critical internal error in the drive's processing unit.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the KSD module for visible damage or loose connections.

  2. 2

    Restart the controller.

  3. 3

    If the error persists after restart, exchange the KSD module.

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Verified technical data. Last updated: March 2026

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