231-A800

Access machine parameters

Press MOD key, select 'Machine parameters' from setup menu, navigate to CfgAxParSafety section for the affected axis.

Always backup current parameters before making changes using the parameter export function.

Check absLimitPos value

Verify the absLimitPos parameter value against machine mechanical limits and required working envelope. Compare with machine drawings or previous parameter backup.

Never set software limits beyond mechanical travel limits - this removes critical safety protection.

Adjust parameter if necessary

If parameter is incorrect, modify absLimitPos value ensuring it remains within safe mechanical limits. Cycle power to activate new parameter.

Test new limits with slow manual movements before running programs.

Check active coordinate system

Review current work offset in position display. Press POS key and verify G54/G55/etc. values in 'Preset table' are correct for current setup.

Use REF position display to see actual machine coordinates versus workpiece coordinates.

Verify datum/preset values

Access 'Tables' menu, select 'Preset table', check if preset values are causing workpiece coordinate system to push program beyond machine limits.

Large preset values can shift the entire coordinate system beyond safe travel limits.

Correct coordinate system

Adjust preset table values or select appropriate work offset. Re-establish datums using touch probe or manual methods if necessary.

Use PRESET function with current position to quickly establish new datum without changing program.

Check position display accuracy

Compare displayed axis position with actual mechanical position using dial indicator or reference marks. Look for position drift or sudden jumps.

Reference the axis (REF key) to re-establish accurate position feedback from encoder reference marks.

Inspect limit switch operation

Access PLC status in diagnostic menu to verify limit switch inputs are functioning correctly. Test switch activation manually if safely accessible.

Never bypass or disable limit switches - they provide critical safety protection.

Verify encoder signals

Check encoder diagnostic values in TNC diagnostic menu for signal quality, reference pulse detection, and position counter integrity.

Encoder contamination or cable issues often show as intermittent position errors before complete failure.

Return axis to safe position

Use Manual mode with reduced feed rate to carefully jog axis back within software limits. Monitor position display continuously during movement.

Move slowly and be prepared to stop immediately if resistance is felt or unusual sounds occur.

Reset alarm condition

Once axis is within limits, press CE key to clear alarm. Verify all axes show normal status before continuing operation.

Check that no other axes were affected by the limit violation or emergency stop sequence.

Verify normal operation

Test axis movement in both directions at slow feed rates to confirm proper operation and that software limits are functioning correctly.

Set up soft limit warnings in machine parameters to alert operators before reaching hard limits.