On 12/5/23 08:17, Leonardo Marsaglia wrote:
Hello guys, and thanks for all the replies!
Well, we swapped the majority of the capacitors on the board and we still
get the alarm on the PSU. I'm almost inclined to consider this a LCNC
project and start doing the conversion.
One thing I'm considering before doing that is if It's possible to use the
original Fanuc Servo motors replacing only the drives. I know the drives
will not be usable because they communicate with their own Fanuc serial
protocol, but maybe there's a chance I can use the same motors.
I'm attaching a picture of the X axis motor so you can see. I guess it
should be possible to control it, but I don't really know how the encoder
works. I know there's a Hostmot encoder module for Fanuc but I don't know
anything about them so swapping the servo motors is another option too. I
have several servo motors here just in case this happened so I can use them.
That looks like the output stage of a 7.5 horse vfd could drive it. A
PID's error voltage might be used to control the driving current, much
like the current crop of smaller 3 phase stepper drivers we have
already, like the LCDA357H but with much higher rated output devices
since that one has a 50 volt, 4 or 5 amp limit. Give me enough time I
could figure that out but someone probably has already. I'm sure you
could move it weakly, laying on the table, with an LCDA357H, a function
generator to make steps, a switch to control direction and a 42 volt
power supply. A proof of concept test. You would have to find its
encoder on the connector though, because w/o the encoder, the LCDA357H
will see an error and shut down on the first step. A schematic of the
connector and description of the encoder would be VERY helpful. The
LCDA357H is designed for quadrature encoders (optical) but sin/cos
magnetic analog types are a different game. The motor itself looks to be
a std 3 phase motor. My bet is the encoder is an analog sin/cos type
needing a carrier frequency drive. In which case the digital encoder
input on the likes of the LCDA357H is worthless. So the encoder is the
$64,000 question. Which is it?
Thanks again a lot for your help guys! Sorry that I don't reply
individually :)
El dom, 3 dic 2023 a las 9:00, gene heskett (<ghesk...@shentel.net>)
escribió:
On 12/3/23 04:42, Roland Jollivet wrote:
If you can obtain/borrow any thermal imaging device, then run with the
PSU
with covers off and check every 5min. You should identify a cap-thermal
problem.
For that, a $500 ir imager would be nice, but a $29 ir thermometer from
the local lumber yard can do as well. Leonardo might even have one of
those in his toolbox, if only to check his food for adequate cooking. I
do. When I'm on the road, living out of the fridge and microwave of a
motel room.
On Sat, 2 Dec 2023 at 21:14, John Dammeyer <jo...@autoartisans.com>
wrote:
From: Chris Albertson [mailto:albertson.ch...@gmail.com]
If it is a simple linear power supply, yes they are very easy to debug
and
repair, LIkey it is the caps.
But switching power supplies are much harder to debug, You can guess it
might be the same issue but these have dozens of parts that can fail..
In any
case, the cost to repair is small.
I disagree. Switching power supplies are way more likely to fail from
high ESR. That the system runs for a short while and then fails is
again a
symptom of a capacitor overheating due to high ESR. Or the voltage is
right on the edge and as the cap warms up the heat results in a change
that
results in the power supply moving out of spec. There may even be
enough
heat developed on the board that a solder joint becomes unreliable.
In the past even PC motherboards have been repaired by a wholesale swap
of
the electrolytics.
So what I would do is an initial survey of the electrolytic capacitors
inside the power supply and order a set. That way the machine can still
run for an hour or so a day while you wait for parts from a reputable
source. Then replace the capacitor when they arrive. That won't
prevent
the power supply from working again and it may well fix the 1 to 2 hour
failure period. In either case $30 or so worth of caps is cheap.
John
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Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
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_______________________________________________
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Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
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