Fanuc Series 15i 150i
Fanuc Alarm SP0220 (no Spindle Amplifier)
A serial spindle could not be recognized.
Cause and Action
When an alarm other than AL–24 is issued for the serial spindle amplifier, turn off the spindle amplifier, then turn on the CNC.
In other cases, check that the serial spindle is connected.
(1) Is the serial spindle amplifier powered?
(2) Is the cable to the serial spindle attached to the correct connector?
(3) Is the cable to the serial spindle broken?
If the above checks do not reveal any abnormality, the printed circuit board in the CNC or the spindle amplifier may be defective.