I think all Fanuc red cap encoders are digital. The question marks are if the coms signal is differential quadrature or serial and if serial what format, and what the commutation tracks/signals are or if they are rolled into the absolute encoder serial signal.
Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031 -----Original Message----- From: gene heskett <ghesk...@shentel.net> Sent: Tuesday, December 05, 2023 11:52 AM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] OT Fanuc ot-c cpu power supply A16B-1212-0950 [EXTERNAL EMAIL] Be sure links are safe. 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 >>>> >>>> >>>> >>>> _______________________________________________ >>>> Emc-users mailing list >>>> Emc-users@lists.sourceforge.net >>>> https://l/ >>>> ists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7C >>>> toddz%40pgrahamdunn.com%7C7fec52bb449e48dca0bf08dbf5b2b254%7C575854 >>>> 4c573f47cebee96c3e0806fb43%7C0%7C0%7C638373920085440908%7CUnknown%7 >>>> CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLC >>>> JXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=4q0NEyFazIVvuKljPpWH3OxAL6W6IlyY >>>> DPKsqFlCu64%3D&reserved=0 >>>> >>> >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://li/ >>> sts.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7Cto >>> ddz%40pgrahamdunn.com%7C7fec52bb449e48dca0bf08dbf5b2b254%7C5758544c5 >>> 73f47cebee96c3e0806fb43%7C0%7C0%7C638373920085440908%7CUnknown%7CTWF >>> pbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI >>> 6Mn0%3D%7C3000%7C%7C%7C&sdata=4q0NEyFazIVvuKljPpWH3OxAL6W6IlyYDPKsqF >>> lCu64%3D&reserved=0 >>> . >> >> 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 >> >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lis/ >> ts.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7Ctodd >> z%40pgrahamdunn.com%7C7fec52bb449e48dca0bf08dbf5b2b254%7C5758544c573f >> 47cebee96c3e0806fb43%7C0%7C0%7C638373920085440908%7CUnknown%7CTWFpbGZ >> sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0% >> 3D%7C3000%7C%7C%7C&sdata=4q0NEyFazIVvuKljPpWH3OxAL6W6IlyYDPKsqFlCu64% >> 3D&reserved=0 >> >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lis/ >> ts.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7Ctodd >> z%40pgrahamdunn.com%7C7fec52bb449e48dca0bf08dbf5b2b254%7C5758544c573f >> 47cebee96c3e0806fb43%7C0%7C0%7C638373920085440908%7CUnknown%7CTWFpbGZ >> sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0% >> 3D%7C3000%7C%7C%7C&sdata=4q0NEyFazIVvuKljPpWH3OxAL6W6IlyYDPKsqFlCu64% >> 3D&reserved=0 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 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
