25031

Review the active NC program block where alarm occurs. Check F-word value and compare against machine limits using Diagnostics > Actual Values menu to view current axis velocity.

Access machine data MD 36100 (Max. feedrate axis) in NCK > Machine Data > Axis-Specific > Velocity & Acceleration. Verify this value matches machine mechanical limits and servo specifications.

Do not increase MD 36100 without validating servo loop bandwidth and mechanical load capacity.

Reduce programmed feedrate in NC program or adjust MD 32000 (Max. feedrate general) to appropriate value. Test with reduced F-word values in single-block mode.

Navigate to NCK > Machine Data > Axis-Specific menu. Record current values for MD 36100, MD 36101 (if G00 rapid), and MD 37100-37106 (dynamic velocity parameters).

Cross-reference these values with machine documentation and servo drive specifications. Verify MD 36100 is set to at least 95% of the motor/drive maximum velocity rating.

If values are conservative, update machine data to match servo specifications and retest. If values are already maximal, the warning indicates programmed feedrate legitimately exceeds safe operating limits.

Changes to velocity machine data require validation via servo tuning and load testing.

Monitor Diagnostics > Actual Values > Axis Velocity (Position control axis view) and compare against Commanded Velocity during a slow manual jog. If actual velocity overshoots command by >5%, servo tuning is suspect.

Check encoder/resolver connection and signal quality. Access NCK > Diagnostics > Encoder/Resolver data. Verify signal voltage and frequency are within specification (typically ±10V sine/cosine or TTL pulse trains).

Review servo loop gain parameters (MD 36200 series - Position control gains, MD 36600 series - Velocity control gains). If gains are excessive, reduce proportional gain (MD 36210 or equivalent) by 10-15% and retest with single-block motion.

Servo tuning changes require validation on test axis before production machines.