[mrmachinst]

Hi everyone. I'm the guy that was having trouble with a Fanuc AC spindle drive on his LB15. Originally got SDU-1 alarm, Fanuc F7 alarm (blown fuse), pointing to shorted Transistor modules. Presumably I blew them from a large voltage drop from the line to the Phase converter running the lathe. I replaced the bad transistor modules and believe that I got all the wiring correct. ( labeled everything and didn't take it all apart at once ).

Now with better service wire coming from the house. When I did a spindle command now I'm getting a SDU-1 alarm and alarm 12 on the Spindle drive unit which points to 'check wiring', bad transistor modules ( already changed them ) or a shorted spindle motor.

I need to know how to check the winding of the motor. Fanuc AC spindle motor model 8 A06B-1008-B902.

Any help greatly appreciated!

[rotec]

Did you resolve the issue, what did you find?