SP0004
Converter Main Power Supply Open Phase
Fanuc · AC Spindle Motor αi-βi Series Parameters
What does SP0004 mean?
An open phase condition is detected in the main power supply to the converter unit of the spindle amplifier. This indicates a loss of one or more phases in the AC input.
Repair Steps
Verified technical data. Last updated: March 2026
Source: Fanuc AC Spindle Motor αi-βi Series Parameters