SP1220

Serial Spindle Amplifier Disconnected (30i)

Fanuc · AC Spindle Motor Alpha i-Beta i Series Parameters

What does SP1220 mean?

The cable connected to the serial spindle amplifier for Series 30i is disconnected, or no serial spindle amplifier is connected. This prevents communication and control of the spindle.

Common Causes

  • Serial spindle amplifier disconnected or not communicating (30i).
  • Spindle drive communication failure.
  • Faulty connection to the serial spindle amplifier.
  • Spindle amplifier offline or unresponsive.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the serial communication cable connection between the CNC and the spindle amplifier.

  2. 2

    Confirm that a serial spindle amplifier is physically connected to the system for Series 30i.

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Verified technical data. Last updated: March 2026

Related Faults

SP0226Framing Error (CNC-Spindle, 15i)SP0228Communication Error (CNC-Spindle Amplifier, 15i)SP0201Duplicate Motor Number Setting (15i)
Source: Fanuc AC Spindle Motor Alpha i-Beta i Series Parameters
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