Fanuc AC Servo Spindle Motor with GS4 drive for CHNC2 Retrofit.

[AcornJosh]

I am working on an CHNC2 Lathe retrofit to OAK with LS L7C drives. I have the drives figured out and will post the wiring and parameters.
Previous thread on LS drives: https://centroidcncforum.com/viewtopic. ... ive#p66557
PLC resource: https://centroidcncforum.com/viewtopic.php?f=64&t=9140



This lathe has a Fanuc AC Servo Spindle motor for the Spindle and I am trying to drive it using a 10hp GS4-2010 drive.
The Spindle motor seems to be a little different from normal 3 phase motors I have used before.

When I first tried to run the spindle, the drive would output about 2 hz at 40 amps and fault out. It would never ramp up in speed.
I switched to P2.11 to 1 of SVC Sensorless Vector and now I can run the spindle at any speed. The odd thing is I measure the full rated current going from the drive to the motor (31amps) as set by parameter P0.01.

I have attached the data plate on the spindle motor. It shows the continuous and 30 min ratings.

Does anyone have any tips on how I should setup this combo?



This motor is really old and I can't find any information but I found something similar. The Alpha 6 on page 49 looks like a newer version. https://www.nexinstrument.com/assets/im ... 06B-08.pdf

[AcornJosh]

I swapped back to the original Fanuc Spindle servo drive and managed to get it working. Its surprising it still works after 35 years.

Retrofitting the spindle drive can be a problem for future me.

[cnckeith]

yeah many of those old fanuc spindle motors were not 'normal' motors as you say.