230-006D

Check LookAhead settings

Navigate to MOD → Machine → LookAhead and verify MP7440 (LookAhead segments) is not set too high. Reduce from default 100 to 50-70 segments.

Monitor CPU load in diagnostic screen while adjusting - aim for <80% utilization

Analyze program geometry

Review NC program for excessive G01 blocks with very small incremental moves (<0.01mm). Use PLANE SPATIAL or higher tolerance values in CAM post-processor.

Do not increase tolerance beyond part quality requirements

Adjust feed rate optimization

Set MP1420 (feed rate optimization) to 1 or 2 instead of 3 to reduce computational load during complex interpolation.

Test with M128 (LookAhead OFF) to confirm if geometry is the root cause

Verify interpolation cycle time

Check MP1010 (interpolation cycle time) matches servo cycle. Standard is 3ms for most TNC systems. Ensure MP1010 = MP1020 (position control cycle).

Use oscilloscope on X122 connector to verify actual cycle timing

Check servo parameter consistency

Navigate to MOD → Machine → Axis and verify MP1030 (speed control cycle) is integer multiple of MP1010. Typical ratio is 1:1 or 2:1.

Changing cycle times requires complete servo optimization

Reset interpolator timing

Execute PLC function M02 (program end) followed by control restart. Monitor for alarm recurrence during first movement after restart.

Log timing with MP7310 diagnostic mask set to monitor interpolator events

Monitor system load

Access MOD → Diagnosis → System and check CPU utilization. Values consistently above 85% indicate resource shortage affecting real-time performance.

Check load during actual machining, not just in manual mode

Optimize PLC program execution

Review PLC program for excessive loops or complex calculations in fast cycle sections. Move non-critical functions to slow cycle (>10ms).

Backup PLC program before making modifications

Disable unnecessary functions

Temporarily disable advanced features like adaptive feed (MP1450=0), cross talk compensation (MP1510=0), and non-essential monitoring functions to isolate CPU load sources.

Re-enable features one by one to identify the specific cause

Check encoder signal quality

Navigate to MOD → Diagnosis → Axis → Position and monitor encoder signals during movement. Look for signal dropouts or irregular incremental counts.

Use oscilloscope on encoder differential signals to check for noise or amplitude issues

Verify encoder cable integrity

Inspect encoder cables for damage, proper shielding connection, and secure connectors. Check cable bend radius in cable chains for fatigue damage.

Power down system before disconnecting encoder cables to prevent damage

Test encoder compensation

Temporarily disable linear error compensation (MP1715=0) and backlash compensation (MP1620=0) to isolate encoder-related polynomial calculation issues.

Compare actual vs. nominal position values in diagnostic screen during slow movements

Check memory utilization

Access MOD → Diagnosis → Memory and verify available RAM. Polynomial calculations require minimum 20% free memory for optimal performance.

Clear program memory and reload to defragment memory allocation

Reduce memory-intensive features

Temporarily reduce MP7440 (LookAhead segments) and MP7430 (path memory) to minimum values to free memory for polynomial calculations.

Document original values before making changes

Perform memory cleanup

Execute complete control restart with memory initialization. Clear all program files and reload only essential programs to eliminate memory fragmentation.

Consider firmware update if memory issues persist - newer versions have improved memory management