GE Fanuc servo amp

[Gordon S. Hlavenka]

So the boss has brought me this puzzle to work on: It's a GE Fanuc
servo amplifier, model A06B-6079=-H301. Apparently he knows a guy who
knows a guy, etc. who is looking to get these and similar things repaired.

At the risk of hubris, I'm pretty sure I can do it. The problem is, I
can't find any of the documentation I need to get started... What I'm
looking for is something that would let me figure out what the inputs
and outputs are, and what the inputs are supposed to DO to the outputs.
There are a couple of big screw terminals at the top which are pretty
obviously power in, and smaller terminals on the bottom that are going
to be outputs to 3 servo motors. But there are a bunch of smaller
connectors in the middle that are much more interesting looking .

I'm guessing (hoping?) that there will be some kind of digital input
that I can talk to, and probably some analog inputs as well. There's a
logic board with a lot of RS232 receivers on it but no transmitters(??)
and some other logic-ky stuff. This plugs into all the high-power
stuff. So I'm figuring I can work on the two halves separately.


Can anybody point me in the right direction for some documentation?
I've found multi-hundred-page pdfs explaining how to use the high-level
software to program a whole GE Fanuc robotic system, but I don't _have_
a whole system. All I've got is this one servo amp and a very
well-stocked workbench.

 

[William Sommerwerck]

You might start with a visual inspection. Is anything obviously burned,
leaking, missing, etc?

I assume the servo has power transistors. I believe they can be tested
in-circuit.

 

[John Smith]

....

Can anybody point me in the right direction for some documentation? I've
found multi-hundred-page pdfs explaining how to use the high-level
software to program a whole GE Fanuc robotic system, but I don't _have_ a
whole system. All I've got is this one servo amp and a very well-stocked
workbench.

After a visual inspection and a check of any easy-to-check power components
I'd move to Google.
www.google.com/#q=A06B-6079-H301+fanuc+service+manual
I didn't see a service manual but there are various pdfs which you may or
may not have seen.

Old guy

 

[Gordon S. Hlavenka]

So the boss has brought me this puzzle to work on: It's a GE Fanuc

Which control did it connect to?

Apparently it came from some sort of CNC machining rig.

I've had it opened up and peered at all the bits; there are some big
IGBTs in there, no surprise, and I could take them out and test them
with a meter to check for gross faults. But what I really want to do is
set up a jig where this thing _thinks_ it's connected up to a PLC on one
side and a raft of servomotors on the other. Then I can put it through
its paces and really verify that it's working as designed.

Of course I don't actually _have_ PLCs or servomotors, but I have 8051s
and arduinos and power resistors and I know how to lie to hardware

To do this I need to know just what sorts of signals go into this amp:
digital commands I'm guessing but what does the data look like?
There'll be feedback coming back from the motors but what? Tach pulses?
Analog voltages? Position sensors? All of the above? There's a
knowledge threshold I need to step over here, and I just need a bit of
help to get to that point. Someplace there's a book...