Originally Posted by
the_gentlegiant
One thing I would do on a machine that sat for awhile is with the power off, open a cover or two and try to turn the screws by hand. Make sure the table and saddle aren't stuck.
Not sure if all Series O controls have it available, but see if you can bring up the servo monitor screen and check the current levels of the servo amps at rest. You might have to change a parameter to get the servo monitor screen to be available. Dig in your manuals and look into the display settings. If it's working it will be some combination of soft and arrow keys to get you to the monitor screen.
And of course, triple check your wiring. You said you checked for shorts to ground. That doesn't tell you if the motor is good, only that it's not shorted to ground. Disconnect the 3 motor leads at the amp and record the ohm readings between lead pairs. You should get fairly consistent reading across all three motors unless your spindle servo happens to be larger then the rest. You might get something different there. There might be small differences because of different motor cable lengths too. Also if you get an open between any leads that would sure signify a toasted motor.
I'm not expert, but just some things to try. Hope it helps.