17010

Check tool holder seating

Manually inspect tool holder insertion depth in spindle taper. Verify proper BT/CAT/HSK engagement and no debris in taper.

Ensure spindle is stopped and in safe position before manual inspection

Verify drawbar operation

Access Service → Spindle → Manual and test drawbar clamp/unclamp cycles. Monitor hydraulic pressure if equipped.

Listen for distinct clamp engagement sound - should be crisp and consistent

Check proximity sensor position

Verify inductive sensor gap to drawbar target (typically 1-3mm). Adjust sensor mounting bracket if necessary.

Use feeler gauges for precise gap measurement when drawbar is extended

Check sensor signal in diagnostics

Navigate to Diagnostics → PLC → Inputs and monitor the tool-in-spindle input (typically I0.0 or similar) during clamp cycles.

Signal should toggle cleanly between 0 and 1 with no intermediate states

Test sensor with multimeter

Disconnect sensor and measure resistance across sensing face with metal target. Should read near 0Ω when activated.

Power down system before disconnecting sensor connections

Verify sensor power supply

Check 24VDC supply voltage at sensor connector. Measure between positive and negative terminals.

Voltage should be stable 24VDC ±10% with no fluctuation during operation

Verify I/O configuration

Check Commissioning → I/O → Digital Inputs and confirm tool-in-spindle input address matches PLC program and wiring diagrams.

Cross-reference electrical drawings with HMI I/O display for consistency

Review PLC program logic

Open STEP 7 or TIA Portal and examine tool monitoring function blocks. Verify logic gates and timer functions are correct.

Only modify PLC code if you have proper backup and authorization

Check NC interface variables

Monitor DB31 or equivalent NC interface DB for tool status bits. Verify PLC writes correct values to NC kernel.

Use online monitoring in PLC software to watch real-time data block values

Review tool management parameters

Access Commissioning → Machine Data → Channel and check MD20100 TOOL_MANAGEMENT_MASK bit settings for tool monitoring enable.

Bit 0 controls basic tool-in-spindle monitoring - set to 0 to disable if not needed

Verify tool change mode settings

Check MD20110 TOOL_CHANGE_MODE and related parameters match your machine's tool change sequence requirements.

Incorrect tool change parameters can cause safety issues - document changes

Reset and test configuration

After parameter changes, perform NC reset (Reset → NC Start) and test with simple tool change cycle.

Use single block mode for initial testing after parameter modifications

Check hydraulic system pressure

Monitor hydraulic pressure gauge during clamp cycles. Should maintain specified pressure (typically 50-80 bar) without drops.

High pressure hydraulic system - follow lockout/tagout procedures

Inspect drawbar for wear

Remove spindle cover and visually inspect drawbar threads, collet fingers, and spring mechanism for damage or excessive wear.

Look for metal shavings or unusual wear patterns that indicate internal damage

Test drawbar pull force

Use drawbar force gauge or pull test equipment to verify clamping force meets manufacturer specifications.

This requires specialized tooling - consider calling service technician if not available