130-0067

Locate Compensation Problem Area

In Test Run mode, single-block through the program approaching the alarm point. Watch the path graphics closely for unusual tool path deviations or compensation loops that indicate problematic geometry.

Use the 'Show Path' function (soft key in Program Run) with radius compensation display enabled to visualize where the compensation path becomes extreme.

Analyze Contour Geometry

Examine the NC blocks before the alarm for segment lengths less than 2× tool radius, or angles between consecutive moves sharper than 10 degrees. Check for duplicate points or micro-segments from CAM post-processor errors.

Toggle Q INFO ON in MDI to display all calculated coordinates - values approaching ±999999999 indicate impending overflow.

Modify Contour or Disable Compensation

Either smooth the contour by removing micro-segments and adding blend radii (RND or CHF), or strategically cancel and reactivate compensation around the problem area using G40, reposition, then G41/G42.

When repositioning with G40, ensure adequate clearance from the workpiece to avoid crashes when reactivating compensation.

Adjust Tool Radius

If geometry cannot be changed, reduce the tool radius value in the tool table (Tool.T) temporarily. Smaller radius reduces the severity of offset calculations on tight geometry.

Check MP7680 (max permissible deviation for radius comp) - increasing this slightly allows the control more tolerance in compensation calculations.

Check Active Kinematic Transformation

In MDI, enter 'FUNCTION PARGET' and check MP7500 (kinematics type). Review which M-code (M128, M138, M114, M144) was active when the alarm occurred and note the rotary axis positions.

Use 'Actual Position' display (POS key) and check all axes including rotary - positions near ±999999999 indicate transformation failure.

Verify Machine Geometry Parameters

Access MOD > Machine Parameters > Tilting working plane (MP2100-MP2150 series). Verify pivot point coordinates, tool reference point offsets, and rotary axis orientations match your actual machine geometry documentation.

Incorrect kinematic parameters can cause crashes. Always verify with machine manufacturer documentation before modification.

Test at Neutral Kinematic Position

Manually move rotary axes to zero position (A0 B0 or C0). Attempt to execute a simple linear move in the working plane. If successful, the issue is position-dependent kinematic singularity.

Check MP2120-MP2129 for valid working range of rotary axes - programmed positions outside these ranges can cause calculation errors.

Simplify or Disable Transformation

If immediate production is needed, cancel the kinematic transformation (M129 for TCPM, M115 for 3D compensation) and program in machine coordinates rather than working plane coordinates.

For 5-axis programs, use FUNCTION TCPM F TCP AUTO to let the control automatically select the best TCPM mode, avoiding manual M128/M138 selection.

Identify Problematic Formula

Scroll backward from alarm position to find recent FN function calls. In Program Run mode, press 'Q INFO' soft key to display all Q-parameter values just before the alarm occurred.

Use STOP M0 strategically before suspected formula blocks, then manually inspect Q-parameter values in the Q-Parameter List (MOD > NC Program Test > Q-Parameters).

Check for Division by Zero or Near-Zero

Review FN2: DIV and FN4: SQRT operations for divisors or radicands approaching zero. Check loop counters and calculated denominators for unexpected zero values from prior calculations.

Add conditional checks: 'FN11: IF +Q10 LT +0.001 GOTO LBL 99' before critical divisions to trap problem values.