Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default GE Fanuc servo amp

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.

--
Gordon S. Hlavenka O- http://www.crashelex.com
"I might have run 'amok' against society; but I preferred that society
should run 'amok' against me, it being the desperate party." - Thoreau
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Default GE Fanuc servo amp

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.


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Default GE Fanuc servo amp

"Gordon S. Hlavenka" wrote in message
...
....

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.
http://www.google.com/#q=A06B-6079-H...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 O- http://www.crashelex.com
"I might have run 'amok' against society; but I preferred that society
should run 'amok' against me, it being the desperate party." - Thoreau



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Default GE Fanuc servo amp

On Wed, 21 Mar 2012 15:34:49 -0600, "Gordon S. Hlavenka"
wrote:

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.

Which control did it connect to?
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Default GE Fanuc servo amp

So the boss has brought me this puzzle to work on: It's a GE Fanuc
servo amplifier, model A06B-6079=-H301.


wrote:
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...

--
Gordon S. Hlavenka O-
http://www.crashelex.com
"I might have run 'amok' against society; but I preferred that society
should run 'amok' against me, it being the desperate party." - Thoreau


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Default GE Fanuc servo amp

On Sat, 24 Mar 2012 11:28:42 -0600, "Gordon S. Hlavenka"
wrote:

So the boss has brought me this puzzle to work on: It's a GE Fanuc
servo amplifier, model A06B-6079=-H301.


wrote:
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...

Of course it came out of some sort of CNC machine. I know that. I
have the connection manuals for the Fanuc 5T and 3M controls. They
would show which wires went where so you could figure out how to
connect it to your faux PLC and servos. That's why I asked which
control the boards came out of. Why don't you ask what control it came
out of? If I have the correct manual I can scan the pages and email
them to you.
Eric
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