The spindle motor got too hot. On the spindle amplifier's display this is alarm 01.
What causes Fanuc alarm SP9001?
Spindle motor cooling fan dirty or not running. Long heavy cuts above the motor's rating. Spindle bearings dragging. Failed thermal sensor or cable.
How do I fix Fanuc alarm SP9001?
Check that the spindle motor fan runs and isn't packed with dust or mist. Let it cool and watch the spindle load meter on the next run. Listen for rough or noisy spindle bearings. Call a tech if the fan is fine and it overheats at normal load, or if the spindle sounds rough.
Alarm numbers and text can differ by control model, software version and machine builder. This page is a starting point from people who have worked on these machines, not a replacement for your machine builder's manual.
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