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Heidenhain Controller
Servo/Axis · Intermediate · 30-120 minutes
HEIDENHAIN 1A0-00FC - No solution in limited range
This alarm indicates the control's kinematic transformation engine cannot calculate valid axis positions to achieve the programmed tool center point and orientation within the defined axis limits and kinematic constraints. The solution requires either modifying the toolpath to avoid problematic orientations, expanding axis limit parameters, or correcting the kinematic model configuration.
1A0-00FC
HEIDENHAIN 1A0-00FC - No solution in limited range
No solution in limited range
A working-plane tilt command failed because SEQ+ or SEQ- imposed a range restriction that leaves no valid solution for the master axis.
Root Cause Summary
This alarm indicates the control's kinematic transformation engine cannot calculate valid axis positions to achieve the programmed tool center point and orientation within the defined axis limits and kinematic constraints. The solution requires either modifying the toolpath to avoid problematic orientations, expanding axis limit parameters, or correcting the kinematic model configuration.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Review Current Axis Limits
Enter MOD mode, navigate to Machine Parameters, check MP1810.0 through MP1810.5 for all axes. Document current software limit switch values for rotary axes (typically 4th and 5th axes).
Do not modify limits without verifying mechanical range and collision zones with machine manufacturer documentation.
- 2
Analyze Program at Fault Position
In MDI or programming mode, position to block number where alarm occurred. Check programmed F TX=, TY=, TZ= tool orientation values or direct rotary axis coordinates. Calculate if resulting rotary positions exceed current MP1810.x limits.
Use the control's simulation with 'show actual values' to see calculated rotary positions before alarm triggers.
- 3
Adjust Limits if Mechanically Safe
If machine physically supports greater range, modify MP1810.x values incrementally. Increase limits by 5-10 degrees at a time and test. Verify no collision risk with Test Run before running in Auto mode.
Always perform dry run with feedrate override at 10% after limit changes to verify safe motion.
- 4
Implement Software Limit Monitoring
Set MP1802.x (monitoring window before limit) to provide advance warning. Typical value is 2-5 degrees before hard limit to allow deceleration.
MP1802.x creates early warnings helping identify marginal toolpaths before they fault.
Call a technician if:
- ·Machine parameter changes required beyond user access level
- ·Kinematic configuration modifications needed
- ·Hardware limit switch adjustments required
Prevention
- Always verify SEQ range adequacy during 5-axis program setup
- Use kinematic simulation before running complex tilted operations
- Maintain adequate tool length margins for tilted operations
- Document working SEQ ranges for different part configurations
Common Mistakes
- Setting SEQ ranges too conservatively without considering actual requirements
- Ignoring kinematic singularity positions when programming
- Using excessively long tools for 5-axis operations
- Not accounting for workpiece geometry in SEQ range calculations
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Always verify with your machine manual or a certified technician before performing service procedures.