595

Check spindle orientation sensor gap with feeler gauge - should be 0.5-1.0mm from target. Clean sensor face and target area of coolant, chips, and debris.

With spindle stopped, manually rotate spindle to orientation position and verify sensor LED illuminates. Check sensor wiring for damage or loose connections at sensor and drive.

Ensure machine is in emergency stop before manual rotation

Use multimeter to verify sensor output signal at spindle drive terminals (typically 24VDC). Check parameter 4960 or 4078 for orientation sensor input signal status.

If sensor tests good but alarm persists, check orientation dog or target on spindle for damage, looseness, or improper mounting position. Replace sensor if output is unstable.

Verify air pressure to spindle is 5-6 bar (72-87 PSI) minimum. Check air regulator setting and listen for air leaks at spindle head and rotary union during orientation attempt.

Execute manual spindle orientation (M19 or M code per machine) and verify brake engages audibly. Check brake confirmation switch operation and wiring connections.

Inspect drawbar operation through spindle taper for smooth movement. Check for chips, coolant buildup, or mechanical binding. Verify Belleville springs are not collapsed or damaged.

Release drawbar pressure before inspection

Check ladder logic for spindle clamp/unclamp confirmation signals. Verify proximity switches on drawbar cylinder are functioning and properly adjusted per machine manual.

Check spindle orientation parameters: 4960-4962 (orientation angle and speed), 4078 (orientation signal). Compare with machine backup or manufacturer specifications.

Verify spindle encoder cable connections at motor and amplifier are secure. Check for cable damage, especially near motor where flexing occurs. Look for error history in drive diagnostics.

Monitor spindle position feedback in diagnostics screen during orientation attempt. Erratic values or loss of position indicates encoder failure or cable issue.

Check spindle amplifier orientation timeout parameter 4081. If too short, increase incrementally. Review alarm history for related encoder alarms (410, 411) that may indicate root encoder failure.