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Verify spindle motor nameplate data and record motor specifications: pole count, rated RPM, rated current, voltage, and encoder type.

Check parameters 4001-4004 (spindle motor code), 4020-4024 (rated speed/current), and 4002 (pole count) match motor nameplate exactly.

Compare control parameters with spindle drive amplifier DIP switch settings or digital parameter settings for motor type and gear ratio.

Incorrect parameters can cause motor thermal damage or runaway conditions

Correct any mismatched parameters, cycle power on both drive and control, then clear alarm and test spindle at low speed first.

Check for additional alarms: BAT (battery low) or alarm 916 (battery alarm) indicating parameter backup failure.

Load verified spindle parameter backup from tape, memory card, or documented parameter sheets specific to this machine.

Never load parameters from a different machine model or spindle configuration

If no backup exists, contact machine tool builder for factory parameter set or reference identical working machine.

After loading parameters, verify critical spindle parameters against motor nameplate, cycle power, and initialize spindle drive.

Verify encoder type installed on spindle motor: pulse coder (relative), absolute encoder, or resolver.

Check parameter 4020 (encoder type) and 4021-4023 (encoder resolution/gear ratio) match actual encoder specifications.

Inspect spindle encoder cable connections at motor and drive for damage, proper seating, and pin integrity.

Disconnect power before inspecting encoder connections

If encoder parameters are correct but alarm persists, test encoder feedback signal at drive with oscilloscope or check for encoder hardware failure.