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Review the program block immediately before and at the alarm location. Identify which G-codes are active when the alarm triggers.

Cancel 3D compensation (G40) before executing reference point returns (G28/G30), plane selection changes, or local coordinate system commands (G52). Move these commands outside the compensation section.

If using circular interpolation (G02/G03) with 3D compensation, verify your control supports this combination by checking parameter 5600-5604. Consider breaking complex arcs into linear moves (G01) if necessary.

Test the modified program in single block mode to confirm the alarm is resolved and tool path is correct.

Always verify tool path with graphics simulation before running modified programs on the machine.

Check the tool nose radius value in the tool offset page. Verify it is smaller than any programmed arc radii and appropriate for the part geometry being cut.

Examine the G41/G42 engagement block. Ensure there is a linear move (G01) of at least 1.5 times the tool nose radius before contacting the workpiece or making directional changes.

Review the G40 cancellation block. Ensure compensation is canceled with a linear move away from the part, not on an arc or at a corner. Add a straight-line retract move if necessary.

Check for sharp angle transitions (less than 90 degrees) in the compensated path that may cause the tool center path to cross itself. Add radius blends or break into multiple passes if needed.

Tool path interference can cause tool breakage or part damage if not properly resolved.

Access parameter settings and verify parameter 5600 (3D compensation setting) is configured correctly for your application. Document current value before any changes.

Changing parameters requires proper access level and can affect all programs. Record original values and consult machine documentation.

Check that your control has the required 3D tool nose radius compensation option enabled. Verify in the CNC option list or diagnostic screen (system configuration page).

Review parameters 5601-5604 for allowable tolerance and geometric conditions. If values are too restrictive, the control may reject valid geometry as illegal.

If parameters were modified, cycle power on the control and retest the program. Contact Fanuc or machine tool builder if the option appears missing or misconfigured.

Parameter changes should only be made by qualified personnel with proper documentation and backup procedures.