280-044D

Check current axis limits

Access MOD function, select 'Machine parameters', navigate to axis-specific parameters and check MP1510 and MP1520 values for the rotary axis.

Document current values before making changes for rollback purposes

Verify measurement position

Check the actual measured position in the measurement protocol or current position display to confirm it exceeds the software limits.

Ensure the measured position is mechanically safe before expanding limits

Adjust software limits

Modify MP1510 and MP1520 to accommodate the measured position, ensuring adequate safety margin beyond the measurement value.

Consider the full range of part geometries that may be measured in the future

Reset and verify

Perform control reset (CTRL+ALT+DEL) to activate new parameters and repeat the measurement cycle to confirm alarm clearance.

Verify reference point setting

Check MP1530 (Reference point) for the rotary axis in the machine parameter menu to ensure it matches the mechanical zero position.

Reference point should typically align with a mechanical datum or index position

Perform reference run

Execute manual reference point approach using the REF function to establish correct axis reference before measurement.

Ensure no workpiece or tooling interference during reference run

Validate reference accuracy

Use a dial indicator or precision measurement tool to verify the reference position matches the expected mechanical datum within tolerance.

Re-execute measurement

Repeat the probe cycle or measurement operation that triggered the alarm to verify the reference correction resolved the issue.

Review probe cycle parameters

Examine the active probe cycle parameters, particularly angular values and rotation settings that may cause calculated positions to exceed limits.

Pay special attention to Q parameters defining angles and coordinate system rotations

Check coordinate system rotation

Verify any active coordinate system rotations (ROT command) are not compounding with probe cycle calculations to create out-of-range positions.

Simulate cycle execution

Use the TNC's simulation mode to trace through the probe cycle and identify where the calculated position exceeds traverse limits.

Modify cycle parameters

Adjust probe cycle parameters to ensure all calculated positions remain within the rotary axis traverse range throughout the measurement sequence.

Verify encoder parameters

Check MP2210 (encoder resolution) and MP2230 (rotary encoder lines) match the actual encoder specifications from the manufacturer documentation.

Incorrect encoder parameters can cause severe positioning errors

Compare commanded vs actual position

Use the position display to compare commanded position with actual encoder feedback during manual axis movement to identify scaling discrepancies.

Check gear ratio parameters

Verify MP2240 (gear ratio numerator) and MP2250 (gear ratio denominator) correctly reflect the mechanical reduction between encoder and axis.

Double-check gear ratios with mechanical drawings or gearbox specifications

Recalibrate if necessary

If parameters are incorrect, update them and perform a complete axis calibration including reference point setting and limit verification.