231-8620

Check Axis Movement Manually

Power down machine and manually move the affected axis to check for binding, excessive friction, or mechanical obstructions.

Ensure machine is properly locked out and axis brakes are released before manual movement

Inspect Way Lubrication

Check lubrication system operation and verify proper oil flow to axis ways and ball screws through MOD 7 diagnostic functions.

Use TNC diagnostic screen to monitor lubrication cycle timing and pressure

Examine Ball Screw and Coupling

Inspect ball screw for damage, contamination, or coupling misalignment that could cause excessive mechanical load.

Listen for unusual noise during slow manual axis movement

Check Machine Parameters

Access MOD 7 and verify machine parameters MP1020 (max axis velocity) and MP1030 (max axis acceleration) are within drive specifications.

Compare current parameters with machine documentation or backup parameter file

Review Servo Loop Parameters

Check servo parameters MP1410 (position loop gain) and MP1420 (velocity loop gain) for proper tuning values specific to your axis configuration.

Incorrect servo parameters can cause instability or damage

Verify Load Inertia Settings

Confirm MP1400 (load inertia ratio) matches actual mechanical load to prevent current demand exceeding drive capability.

Use Heidenhain's servo optimization function if available on your TNC version

Monitor Drive Current

Use TNC diagnostic display to observe actual current draw during axis movement and compare to rated motor current specifications.

Check both peak and RMS current values during different motion profiles

Check Motor Temperature

Verify motor temperature sensors are functioning and motor is not overheating, which reduces torque capability.

Allow motor to cool before inspection if overheating is suspected

Test Drive Performance

Perform axis calibration routine through MOD 7 to assess drive system performance and identify degradation.

Document performance test results for comparison with baseline values

Reduce Feed Rate

Temporarily reduce programmed feed rate (F value) by 25-50% to determine if cutting load is causing the alarm condition.

Use TNC's feed rate override during testing to quickly adjust cutting parameters

Check Cutting Tool Condition

Inspect cutting tools for wear, damage, or improper geometry that increases cutting forces and axis loading.

Worn tools can cause sudden load increases and potential workpiece damage

Optimize Cutting Parameters

Review and adjust spindle speed, depth of cut, and feed rate in the part program to reduce axis loading while maintaining productivity.

Consider using TNC's adaptive feed control if available to automatically adjust for varying cutting loads