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Verify spindle motor nameplate data (model number, power rating, voltage, amperage, pole count) matches physical motor.

Check spindle parameters 4001-4005 (motor type/code), 4020-4025 (motor spec), and 4055-4060 (encoder type) against motor documentation.

Compare current parameters against original OEM parameter backup or machine documentation to identify discrepancies.

Document all parameters before making changes. Incorrect motor parameters can cause thermal damage.

Correct mismatched parameters using proper motor specification data, cycle power, and verify alarm clears with spindle orientation test.

Power off machine and verify spindle amplifier module is fully seated in correct slot position per electrical schematic.

Follow LOTO procedures. High voltage present inside cabinet.

Check amplifier hardware DIP switches or rotary switch settings for axis ID assignment match parameter 4001 or 4002 (spindle axis designation).

Verify serial communication cable connections between CNC and spindle amplifier are secure and properly terminated at both ends.

Check parameters 8135-8140 (spindle serial channel assignment) to ensure proper amplifier channel is designated for spindle control.

Check for low battery alarm (BAT alarm 901 or 910) on control display or in alarm history, indicating potential parameter loss.

Compare current date/time on control against actual time. Significant discrepancy indicates battery failure and probable parameter corruption.

Access parameter screen and verify spindle parameters 4000-4200 series have non-zero, realistic values rather than all zeros or defaults.

Reload complete parameter backup from CF card, USB, or documented backup source, replace battery if needed, and cycle power.

Ensure parameter backup is correct for this specific machine. Wrong parameters can damage equipment.