231-8610

Check axis movement manually

In Manual mode, jog the affected axis at low feedrate (10-50 mm/min) and observe for binding, unusual noise, or excessive force required.

Ensure machine is properly homed and all guards are in place before manual movement

Inspect mechanical components

Check ballscrews, linear guides, and coupling for damage, contamination, or inadequate lubrication. Verify proper backlash compensation settings.

Listen for grinding or clicking sounds that indicate bearing failure or debris

Verify load parameters

Access Machine Parameters and check motor load ratings against actual cutting forces. Review parameters for axis inertia and friction compensation.

Compare current draw in Position Loop menu during normal operation versus when alarm occurs

Check I²T monitoring settings

Access Service menu → Drive Parameters and verify I²T time constant and current limit parameters match motor specifications exactly.

Document original values before making changes for easy rollback

Verify motor thermal parameters

Compare motor nameplate data with configured thermal time constants and continuous current ratings in drive setup parameters.

Incorrect thermal parameters can lead to motor damage or nuisance trips

Reset I²T accumulator

Clear accumulated thermal load by powering down the drive for sufficient cooling time, then restart and monitor current levels during operation.

Use oscilloscope function in TNC to monitor real-time current draw patterns

Check motor cooling system

Verify cooling fan operation, air flow paths are clear, and liquid cooling (if equipped) has proper flow rate and temperature.

Allow motor to cool completely before handling - surface temperatures can exceed 80°C

Measure motor temperature

Use infrared thermometer or check temperature sensor feedback in TNC diagnostics to verify actual motor temperature versus thermal model.

Motor surface temperature should not exceed 70°C during normal operation

Inspect motor mounting and ventilation

Ensure proper motor mounting allows heat dissipation and ventilation paths are not blocked by chips, coolant, or debris.

Clean motor housing and cooling fins with compressed air during regular maintenance

Analyze position loop performance

Use TNC's Position Loop menu to observe following error and current consumption during moves. Look for oscillations or excessive following error.

Stable systems show smooth current profiles without high-frequency components

Check servo gain settings

Review velocity loop gain (Kv), position loop gain, and integral time constants in servo parameters. Reduce gains if oscillation is present.

Document original tuning parameters before making adjustments

Perform auto-tuning sequence

Execute automatic servo optimization routine in Service menu if available, or manually tune using step response method while monitoring current draw.

Auto-tuning works best on unloaded axes - remove workpiece and tooling if possible