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Heidenhain Controller
Servo/Axis · Intermediate · 30-120 minutes
HEIDENHAIN 293-0004 - Incorrect filter form in axis
Alarm 293-0004 occurs when a position filter configuration in the servo parameters is incompatible with HSC (High Speed Cutting) requirements. The TNC system requires specific filter forms for HSC operation, and non-compliant filter settings will trigger this alarm.
293-0004
HEIDENHAIN 293-0004 - Incorrect filter form in axis
Incorrect filter form in axis
This TNC7/TNC 640 error indicates a servo-related condition. Only position filters with HSC form are allowed. The control has detected an issue that requires investigation.
Root Cause Summary
Alarm 293-0004 occurs when a position filter configuration in the servo parameters is incompatible with HSC (High Speed Cutting) requirements. The TNC system requires specific filter forms for HSC operation, and non-compliant filter settings will trigger this alarm.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access machine parameters
Press MOD key, select 'Machine parameters' from the menu, navigate to servo parameters section.
Use the search function (GOTO) to quickly find MP1420 parameters
- 2
Check MP1420 position filter settings
Examine MP1420.x for the affected axis. Verify the filter type is set to HSC-compatible form (typically value 2 or 3).
Document original values before making changes
- 3
Modify filter configuration
Change MP1420.x to HSC-compatible filter form. Consult machine documentation for approved values.
HSC-compatible filters typically have better frequency response characteristics
- 4
Restart control and test
Perform control restart (CTRL+ALT+DEL) and test axis movement in HSC mode to verify alarm clearance.
Call a technician if:
- ·Parameter changes don't clear alarm
- ·Servo instability after filter modification
- ·Uncertainty about HSC requirements
Prevention
- Document all parameter changes
- Verify HSC compatibility before enabling
- Maintain parameter backups
- Follow proper commissioning procedures after hardware changes
Common Mistakes
- Changing filter parameters without understanding HSC requirements
- Enabling HSC without updating all related parameters
- Using generic parameter sets for specific hardware configurations
Seeing Multiple Alarms?
Seeing another alarm with this one? Enter the code.
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Always verify with your machine manual or a certified technician before performing service procedures.