280-07D3

Check Tool Table Status

Press TOOL TABLE key, navigate to the problematic location number and verify the STATUS column shows 'FREE' not 'LOCKED' or 'OCCUPIED'.

Use soft key 'SHOW ALL' to display all tool table columns including status flags.

Reset Tool Location Status

In tool table, select the location and press RESET TOOL soft key, then confirm the status changes to 'FREE'.

Ensure no physical tool is actually present in the location before resetting.

Verify PLC Tool Status Signals

Access PLC status via MANUAL mode > PLC soft key, check tool changer input signals for the specific location match the tool table status.

Check PLC Tool Changer Inputs

Navigate to MANUAL > PLC > INPUT and monitor the tool changer location release signals (typically M-functions 06-19 range) while cycling the mechanism.

Document the current state of all tool changer related inputs before troubleshooting.

Test Manual Location Release

Execute M-function for manual location release (usually M06 T0) in MDI mode to verify PLC response and signal feedback.

Ensure machine is in safe position and all guards are closed before executing M-functions.

Verify PLC Program Logic

Check PLC program for tool changer location release logic, verify timer functions and interlock conditions are not preventing release signal.

Reset PLC Tool Changer Module

Power cycle the PLC or reset the tool changer module through PLC diagnostics menu to clear any stuck states.

Check Tool Management Parameters

Access MOD function, enter code 123, navigate to machine parameters 7260-7299 (tool management) and verify tool changer type and location count settings.

Parameter 7261 defines the tool changer type - ensure it matches your wheel head configuration.

Verify Location Assignment Parameters

Check parameters 7280-7289 for wheel head location assignments and ensure the problematic location number is properly defined.

Never change machine parameters without proper documentation and backup.

Validate PLC Interface Parameters

Review parameters 7700-7799 (PLC interface) to confirm tool changer handshake signals are correctly mapped to PLC inputs/outputs.

Inspect Wheel Head Position Sensors

Visually check all proximity sensors on the wheel head for damage, contamination, or misalignment that could affect position feedback.

Ensure machine power is locked out before accessing wheel head mechanism.

Test Manual Wheel Head Movement

Use manual wheel head positioning controls to move to the problematic location and verify smooth mechanical operation and sensor activation.

Listen for unusual noises during movement that might indicate mechanical binding or wear.

Check Clamping Mechanism Operation

Verify the wheel head clamping/unclamping mechanism operates correctly at the problematic location and releases fully.

Never attempt to force mechanical movement - investigate root cause of any binding.