SP0021

Position Sensor Polarity Setting Incorrect

Fanuc · AC Spindle Motor αi-βi Series Parameters

What does SP0021 mean?

The polarity setting for the position sensor is incorrect. This can lead to incorrect position feedback and unstable spindle control.

Repair Steps

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Verified technical data. Last updated: March 2026
Source: Fanuc AC Spindle Motor αi-βi Series Parameters
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Fanuc Error SP0021: Position Sensor Polarity Setting Incorrect — Troubleshooting Guide | ErrorLib