160-0143

Check Current Axis Position

Observe the position display on the TNC screen. Note which axis is near or at its travel limit. Compare current position against machine travel range.

Position display shows red background when axis is at or beyond software limit

Verify Software Limit Parameters

Access MOD > Machine Parameters > General tab. Check MP 1320 (negative software limit) and MP 1323 (positive software limit) for the affected axis. Verify these values match machine mechanical capabilities.

Changing software limits requires machine parameter access rights and understanding of actual mechanical travel limits

Review Datum Shift and Preset

Check active datum shift (Cycle 7, Cycle 247, or PRESET table). Verify that datum placement hasn't positioned the working envelope beyond software limits. Access MOD > Preset Table to review.

Use POS SHOW OPER (actual position) versus POS SHOW REF (reference position) to identify datum offset issues

Clear and Re-establish Position

If position is valid but alarm persists, manually jog axis away from limit using handwheel or incremental jog. Reset alarm with CE key. Re-reference axis if necessary using defined reference point cycle.

Ensure adequate clearance from workpiece and fixtures before manual jogging

Check Active Workspace Monitoring

Review NC program for FUNCTION WORKING SPACE or M128 commands. Access MOD > Working Space menu to view currently defined workspace limitations including cuboid boundaries.

Workspace monitoring remains active until explicitly deactivated with M129 or program end

Verify Workspace Coordinates

In MOD > Working Space, check the defined X, Y, Z minimum and maximum coordinates. Compare these against the programmed tool path and current tool position to identify conflict.

Workspace coordinates are always referenced to the active datum, not machine zero

Test Without Workspace Monitoring

Temporarily deactivate workspace monitoring by programming M129 in MDI mode or commenting out FUNCTION WORKING SPACE in the NC program. Test axis movement to confirm workspace was the cause.

After testing, always re-enable workspace monitoring for production use to maintain collision protection

Adjust Workspace or Tool Path

Either expand workspace boundaries to accommodate the required tool path, or modify NC program to keep tool within defined safe zone. Update FUNCTION WORKING SPACE parameters accordingly.

Ensure expanded workspace boundaries do not compromise fixture or workpiece protection

Check Probe Status and Signal

Access MOD > Touch Probe Monitoring. Verify probe status shows 'not deflected' when probe is free. Check if probe signal is latched or intermittent. For radio probes, verify battery status and signal quality.

Never manually deflect probe beyond designed travel limits during testing

Review Movement Before Alarm

Check NC program sequence before the canceled movement. Verify adequate clearance moves exist after previous probing cycle. Confirm SET UP probe deactivation (Cycle 9 with Q330=0) was executed if required.

Use Test Run mode with graphics to visualize probe-to-part clearances before actual machining

Verify Probe Cycle Programming

Review probe cycles for correct sequence: Cycle 9 activation, measurement cycle, appropriate retract distance. Check Q320 (set-up clearance) provides sufficient probe-to-part distance for positioning moves.

Minimum Q320 clearance should be at least 5mm plus longest tool in tool table to prevent accidental triggers

Test Probe Electrical Circuit

In MOD > Touch Probe Monitoring, observe real-time signal state while manually (gently) deflecting probe stylus. Signal should change cleanly between states. Check cable routing for interference or damage.

For infrared probes, check for coolant spray or chips blocking optical path; for radio probes verify no metal obstructions between probe and receiver