230-0198

Check Maximum Speed Parameters

Access MOD function, select Machine Parameters, navigate to MP1020 (spindle) or MP1021 (axis) and verify maximum speed settings match motor specifications.

Compare MP values with motor nameplate data - many issues stem from incorrect parameter entry during commissioning.

Verify Current Program Feed Rate

Check active NC program for excessive F values or rapid traverse rates that exceed calculated machine capabilities based on MP1020/MP1021 settings.

Never increase maximum speed parameters without verifying mechanical system capabilities and safety interlocks.

Test with Reduced Feed Override

Set feed rate override to 25% and attempt program execution to confirm if alarm clears, indicating feed rate exceeds machine parameter limits.

Review Acceleration Parameters

Access Machine Parameters MP1030 (acceleration) and MP1031 (deceleration) via MOD function and verify values are appropriate for machine mechanics and motor specifications.

Start with conservative ramp values (50% of motor capability) and gradually increase while monitoring for alarms.

Calculate Speed-Ramp Relationship

Verify that programmed feed rates can be achieved within the acceleration ramp time without exceeding maximum nominal speed calculations.

Aggressive ramp settings can cause mechanical damage - always consider machine inertia and coupling stiffness.

Test Ramp Modifications

Temporarily increase ramp time values by 25% and test program execution to determine if alarm condition resolves.

Monitor Analog Command Voltage

Use TNC diagnostic screen (CTRL+DIAG) to observe analog output voltage levels during alarm condition - look for values approaching ±10V limits.

The voltage monitor in diagnostic mode shows real-time command values - capture peak values during acceleration phases.

Check Servo Drive Scaling

Verify servo drive velocity scaling matches TNC analog output range - adjust drive parameters or TNC scaling factor MP1040 if available.

Changing analog scaling affects all programmed speeds - verify with test programs before production use.

Validate Control Loop Gain

Review position loop gain settings in machine parameters to ensure proper relationship between commanded and actual speeds without saturation.

Check Encoder Signal Quality

Access TNC encoder diagnostic display via CTRL+DIAG and verify encoder signals show clean, stable feedback without noise or dropouts during motion.

Look for encoder error counters incrementing - even small counts indicate signal integrity issues that affect speed calculations.

Verify Servo Drive Communication

For digital drives, check communication status in TNC diagnostic screens and verify no communication errors or timeouts are occurring.

Communication errors can cause unpredictable machine motion - ensure all personnel are clear before testing.

Test Individual Axis Movement

Use manual mode to test each axis individually at low feed rates to isolate which axis/spindle is generating the alarm condition.