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Navigate to SYSTEM > PARAM and check parameters 5470-5479 (interference check enable bits) to verify bit settings for each axis. Confirm parameter 5470 bit 0 (interference check enable) is set to 1.

Check parameters 5480-5489 (interference area setting for each axis). These define the minimum allowable separation distance between tool posts. Verify values match machine mechanical limits and provide adequate safety margin (typically 50-150mm depending on machine size).

Review the NC program at the alarm point. Check commanded positions for both paths in CURRENT POSITION screen (POSITION > ACTUAL). Calculate the separation distance along the alarmed axis and compare against parameter 5480+n values.

If parameters are correct, revise NC program to maintain greater separation during simultaneous operations. Use M-codes for interlock (M68/M69 or custom M-codes) to sequence operations and prevent both turrets from entering interference zones simultaneously.

Disabling interference check parameters removes critical collision protection. Only adjust after verifying mechanical clearances with manual jogging.

Navigate to DIAGNOSIS > PARAMETER and check diagnostic 300 (reference point establishment status). Verify all axes on both paths show bit 7 = 1 (reference point established). If bit 7 = 0 on any axis, perform reference point return (G28 or manual zero return) for affected path.

Check DIAGNOSIS > SERVO screen, diagnostics 300-399 for position error (diagnostic 300 for each axis). Excessive position error (>0.5mm) on the second path may cause incorrect interference calculations. Compare position error between both paths.

Verify absolute encoder battery voltage via DIAGNOSIS > PMC > SIGNAL or check ladder for battery alarm signals. Low battery (<3.0V for absolute encoders) can cause position data corruption on the secondary path.

Perform manual jog test with both turrets in HANDLE mode. Manually position turrets to known safe separation and verify CURRENT POSITION values match physical positions. Check for backlash or mechanical slippage on second path axes.

Ensure E-stop is readily accessible during manual positioning tests with both turrets.

Navigate to PMC > PMCDGN > SIGNAL and monitor G-address signals related to interference (commonly G0040-G0047 for two-path interference zones). Observe signal status while manually jogging turrets - signals should change state at defined boundaries.

Access PMC > LADDER and search for ladder rungs containing functional instructions related to interference (search for comments containing 'INTERFERENCE' or 'COLLISION'). Check for AND/OR logic conditions that may incorrectly hold interference signals active.

Inspect proximity sensors or limit switches physically mounted on the machine saddles/turrets for debris, damage, or misalignment. Check sensor LED indicators (if equipped) and verify 24VDC supply voltage at sensor connectors.

Temporarily force-off the suspect G-address interference signal via PMC > PMCDGN > SIGNAL (I/O override function) to isolate whether alarm is PMC-generated or parameter-based. If alarm clears, troubleshoot PMC input circuit and sensor wiring.

Forcing interference signals defeats collision protection. Only use for diagnostic purposes with machine in safe manual mode. Restore normal operation before running production programs.