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Heidenhain Controller
Safety · Intermediate · 30-120 minutes
Heidenhain 905-293C - No. of safety pos.
The Heidenhain 905-293C alarm, 'No. of safety pos.,' typically occurs due to issues with the safety position data or incorrect T command configurations in the NC program. The most likely fix involves verifying and correcting the safety position parameters or adjusting the T command in the program. If unresolved, it may require deeper inspection of the control system or parameter settings.
905-293C
Heidenhain 905-293C - No. of safety pos.
No. of safety pos.
Heidenhain TNC error 905-293C: No. of safety pos. This alarm indicates a fault or error condition on the Heidenhain TNC control that requires investigation. Refer to the Heidenhain NC error message documentation for the specific cause and remedy for this alarm code.
Root Cause Summary
The Heidenhain 905-293C alarm, 'No. of safety pos.,' typically occurs due to issues with the safety position data or incorrect T command configurations in the NC program. The most likely fix involves verifying and correcting the safety position parameters or adjusting the T command in the program. If unresolved, it may require deeper inspection of the control system or parameter settings.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access Machine Parameters
Log into the Heidenhain control system using the appropriate access code and navigate to the machine parameter menu (refer to the service manual for specific menu paths).
Take a screenshot or note down original values before making changes for easy rollback if needed.
Ensure the machine is in a safe, powered-down state before accessing parameters to avoid accidental movement.
- 2
Verify Safety Position Values
Check the safety position values (often under MP series parameters like MP1310 or similar). Compare them against the machine's documentation or OEM specifications.
Use the Heidenhain diagnostic tool if available to cross-verify parameter integrity.
Incorrect values can cause machine crashes; double-check inputs.
- 3
Adjust and Test Parameters
If discrepancies are found, adjust the safety position values to match the correct specifications. Save changes and perform a test cycle in manual mode to confirm the alarm clears.
Run the test cycle at reduced speed to minimize risk during verification.
Monitor for unexpected behavior during testing.
Call a technician if:
- ·If parameter adjustments or program corrections do not resolve the alarm after multiple attempts.
- ·If hardware issues with position sensors are confirmed and replacement or calibration expertise is beyond in-house capability.
Prevention
- Regularly back up machine parameters and NC programs to prevent data loss.
- Perform routine checks on position sensors for alignment and cleanliness.
- Train operators on correct T command usage to avoid programming errors.
- Schedule periodic software updates and diagnostics to catch glitches early.
Common Mistakes
- Ignoring initial alarm occurrences, leading to cascading errors or machine downtime.
- Making parameter changes without documenting original values, complicating rollback if issues arise.
- Attempting repairs without proper lockout/tagout procedures.
- Working on electrical components without appropriate safety training or PPE.
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Always verify with your machine manual or a certified technician before performing service procedures.