fault on means drive is unhappy. can u rs232 in and ask it why it is sick? it will tell you. otherwise gotta take it out and send for rpr
Know it MIGHT be something external to the vfs5 too: it could be a bad spindle motor thermostat, bad spindle motor resolver position feedback, or bad spindle motor winding. these do not happen as often as drive failure though. another reason to use motionlink plus and ask drive what is wrong (it keeps the last 10 faults listed inside).