267

Review the program lines at and immediately after the alarm point. Identify any active canned cycles (G73-G89) and examine the G-codes programmed in the same block or following blocks.

Check for incompatible G-codes such as G02/G03 (circular interpolation), G41/G42 (cutter compensation), or multiple Group 01 motion commands programmed during the retract sequence.

Cancel the canned cycle with G80 before programming any conflicting motion commands or tool path changes. Ensure proper modal separation between canned cycle operations and subsequent moves.

Re-verify program syntax using program check mode or graphical simulation before executing on the machine. Confirm proper G-code sequencing per Fanuc programming manual for your specific control model.

Determine if the alarm occurred during program restart, optional block skip processing, or after using the retrace function. Check if circular interpolation (G02/G03) exists in the retrace path.

Review parameter 3407#1 (circular interpolation during retrace enable/disable). If set to prohibit circular moves during retrace, rewrite affected program sections using linear (G01) moves or approach from a different starting point.

Changing parameters may affect other programs. Document original values and consult parameter manual before modification.

If using program restart function, select a restart block that begins with simple linear motion (G00/G01) rather than within complex motion sequences or canned cycles.

Verify that no coordinate system changes (G52-G59), scaling (G51), or rotation (G68) commands are active during retrace. Cancel these modes before the retrace starting point if necessary.

Examine program blocks around the alarm location for tool compensation commands (G40, G41, G42, G43, G44, G49). Note whether these appear within or immediately after canned cycle blocks.

Ensure tool radius compensation is canceled (G40) and established only during appropriate linear or circular moves, not during rapid positioning (G00) or canned cycle operations. Maintain at least one full G01 move after G41/G42 activation.

Move any tool length compensation calls (G43) to occur before entering canned cycles, typically in the tool change sequence or initial approach move. Do not change H-offset values during active drilling/tapping operations.

Review program structure to ensure proper compensation sequence: activate compensation on approach, perform machining operations, then cancel compensation on a clearance move before returning to home or tool change position.