I’m working on a Fanuc Spindle Drive, Model # A06B-6059-H003, in an early 90’s Kiwa 510 Machining Center. You can command the spindle in either direction, but when you give it a stop command it just coasts to a stop. If it coasts long enough it will display an AL-03 alarm on the drive. I don’t have a manual for the drive, but from what I’ve found on the web AL-03 is “DC Link fuse blown” That made me believe that the IGBT’s were probably smoked and I would need to check the firing circuit of the top board, but we just so happen to have a spare drive on hand in the shop, so I swapped over the whole unit. Now, I don’t know anything about the drive I put in (whether its good or bad) it was just on the shelf and labeled good, which doesn’t mean much, but after swapping it in , it operates exactly the same……stop the spindle and coast….eventually giving the AL-03 alarm….
So, do I have 2 bad spindle drives?
I’ve checked all my voltages, fuses, megged my spindle motor(phase to ground) and everything seems to check ok.
I think I’m just a little thrown off because the two drives operate exactly the same.
Anybody have anything else they can think of that I can check before I send these drives off to be serviced?
Thanks…..Matt