25060

Access Siemens HMI or Service menu and navigate to Diagnosis > Parameters > Machine Data (MD). Locate axis-specific MD 36210 CTRLOUT_LIMIT.

Do not modify while machine is running or axes are in motion.

Compare current MD 36210 value against the maximum required speed from your NC program (typically G0 rapid or G1 feed rate commands). Verify against motor nameplate rated speed and control system specifications.

If MD 36210 value is below 100%, increase incrementally to 100% (or per machine builder specification). Save changes and perform warm restart (Ctrl+Shift+F5 or Menu > System > Restart).

Verify thermal and mechanical load limits before setting to 100%.

Re-run the NC program that triggered the alarm and monitor axis actual speed vs. setpoint via Diagnosis > Signals > Actual Velocity display.

Check the NC program source file (.mpf, .spf) for G0 (rapid) blocks and G1 (linear) blocks with F-word values. Cross-reference against machine specifications for maximum safe feed rates per axis.

Never exceed machine builder limits; refer to Machine Configuration documentation.

Inspect the feedrate override and spindle speed override controls on the operator panel. Reduce feedrate override from 100% to 50% and attempt to re-cycle the program in JOG or AUTO mode.

Monitor axis servo error and actual speed on the display while running at reduced override.

If alarm clears at reduced override, gradually increase override in 10% increments while monitoring servo stability. Record the override percentage at which alarm re-triggers.

Edit the NC program to reduce G0 and G1 feed rates, or advise operator to maintain lower override settings. Verify changes via Simulation mode before production run.

Verify physical motor nameplate data (kW, RPM, voltage). Compare against axis configuration in Siemens HMI: Menu > Machine Data > Axis-Specific > Motor Data (MD 31010 MOTOR_TYPE, MD 31100 MOTOR_SPEED_MAX).

If motor speed parameters are incorrect, correct them to match nameplate. For SINUMERIK 840D, update MD 31100 (max motor speed in rpm) and verify MD 36210 recalibration occurs after system restart.

Motor parameter changes require warm restart and may affect all programmed speeds; test on scrap material first.

Check encoder/feedback resolution (MD 32010 FEEDBACK_RESOLUTION) and verify scaling matches motor type (linear or rotary). Incorrect feedback scaling can cause setpoint monitoring errors.

Run Siemens diagnostic: Diagnosis > Hardware > Servo Drives. Confirm actual motor speed matches commanded speed in JOG mode at 50% override; compare error values (should be <2%).