Hi all, I've got a Hurco with the Fanuc AC triple servo drive amplifier, Fanuc# A06B-6050-H401, driving red cap motors. The drive's got some issues
.
Immediately upon power-up, the "M" channel lights its TG led, which I have been told means some sort of fault with the encoder on the motor. Then, a few seconds later, the "M" channel OC light comes on (Overcurrent?). At this point, the drive's 200VAC contactors haven't been closed by the control, yet, so there's no DC bus voltage, and there can't possibly be a real overcurrent.
I first thought that I had bad encoder wiring or a bad encoder, but when exchanging the wiring at the drive between the "L" channel and the "M" channel the fault stays with the "M" channel.
I was told that shifting the S10M jumper would disable fault detection for the "M" channel. When I shift this jumper the drive doesn't show any fault LED's. I didn't try to run the machine with the "M" channel fault detection disabled.
I suspect there is some fault with the TTL logic on the drive. I spent a few hours today checking the encoder signal paths with my oscilloscope. All of the encoder outputs are working: there are "1","2","4","8" signals used by the drive, and A/B/Z/!A/!B/!Z signals which are used by the drive for faulty cable detection (I think..) and used by the control for positioning. I haven't determined anything conclusive, but I suspect that the fault detection logic is itself faulty!
I don't have the manual for the drive, supposedly Fanuc # B-54765E, though I am trying to get it from Fanuc. I can't imagine there is component level troubleshooting data in it, though.
If anyone has experience with this problem, or even with this drive, I'd like to hear from them. I have a
thread going in the Hurco forum, but Fanuc equipment is unusual on Hurco machines so I wanted to put a post up here, too.
Thanks,
Aaron
02-10-2010, 10:32 PM
Similar Threads 
Linear Mode
