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
Check the KSD module for visible damage or loose connections.
- 2
Restart the controller.
- 3
If the error persists after restart, exchange the KSD module.
Verified technical data. Last updated: March 2026
Related Faults
Source: Kuka KR C2 Robot Controller