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Check Current Y Position

Press CURRENT COMMANDS and note the Y-axis position. Compare to Parameter 221 value in SETTING > PARAMETERS menu.

Use HANDLE JOG to move away from limit if close to boundary

Verify Program Coordinates

Review G-code for Y-axis moves. Check if Work Coordinate System (G54-G59) offsets are pushing moves beyond machine limits.

Always verify work offsets before running programs on different setups

Adjust Software Limits

If machine physically capable, increase Parameter 221 (Y+ Software Limit) value. Requires Parameter Lock Code entry.

Leave 0.1-0.2 inch safety margin from actual mechanical limit

Check Limit Switch Status

Navigate to DIAGNOSTICS > INPUTS and verify Input 13 (+Y LIMIT) status. Should show OFF when not at limit.

Limit switches are normally closed - they open when activated

Manually Move Away from Limit

Use HANDLE JOG in -Y direction to move axis away from limit switch. May need to hold LIMIT OVERRIDE while jogging.

Use LIMIT OVERRIDE cautiously - only move away from limit, never into it

Test Limit Switch Function

After clearing alarm, slowly jog toward +Y limit while monitoring Input 13 status to verify proper switch operation.

Replace limit switch if it shows intermittent operation or fails to activate

Check Active Work Offset

Press WORK OFFSETS and verify which coordinate system is active (G54-G59). Check Y-axis offset value for reasonableness.

Use PART ZERO SET function for accurate work offset establishment

Calculate Total Y Position

Add programmed Y coordinate to active work offset Y value. Verify total doesn't exceed Parameter 221 limit.

Always simulate programs with new work offsets before running

Correct Work Offset

Adjust work offset Y value to keep all programmed moves within machine limits. Use edge finder or probe for accurate setup.

Set Parameter 33 (WORK COORDINATE LOCK) to 1 to prevent accidental offset changes

Check Servo Drive Status

Navigate to DIAGNOSTICS > DRIVES and check Y-axis drive status. Look for fault codes or error indicators on drive display.

Note any fault codes - they provide specific failure information

Verify Position Feedback

Compare commanded position with actual position in CURRENT COMMANDS. Large discrepancy indicates feedback problem.

Do not attempt to move axis if position feedback is questionable

Perform Reference Return

Execute home cycle (REF RETURN) to re-establish axis position. If unsuccessful, check encoder connections and drive parameters.

Clear any drive faults before attempting reference return

Visual Inspection

Inspect Y-axis travel path for chips, tools, fixtures, or other obstructions. Check for obvious mechanical damage.

Ensure spindle is stopped and machine is in safe condition before inspection

Check Mechanical Components

Examine ballscrew, linear guides, and limit switch mounting for damage. Look for bent or broken components.

Listen for unusual noises when manually moving axis - grinding or binding sounds indicate mechanical issues

Clear Obstruction and Test

Remove any obstructions found. Test axis movement manually first, then with power on using handle jog at slow speeds.

If mechanical damage is found, do not operate machine until repairs are completed