It sounds like the problem is most likely a tuning or configuration issue. But I'm afraid I won't be much help there because I have no experience setting up that particular drive. I wouldn't be surprised if the auto tuning in the drive only really works with the drives position mode, and doesn't help with the velocity loop when it's by itself. On some of the drives I've tuned tuning the velocity loop is done by sending an alternating velocity step command and you'd do the same for tuning the velocity/torque loop side of a duel loop set up in Linuxcnc (you could use sig-gen for this purpose) then use hal scope to monitor the velocity feedback and tune the drive's velocity loop parameters to get the fastest response with minimal overshoot and settling time. Basically you want to try to make the velocity feedback match the square wave output by the sig-gen as closely as possible with no ripple or overshoot during the steady state of the velocity move.
PS don't make the move too long or too fast, because it can be very hard on the machine hardware. A few inches/sec may be enough to tune it. Remember this thing will/should be exerting maximum torque at the reversals. That's a lot of bang, bang, bang. And this test may be impossible to do on a very short or un balanced axis such as an unbalanced Z axis. Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031 -----Original Message----- From: andrew beck <andrewbeck0...@gmail.com> Sent: Wednesday, September 01, 2021 5:51 PM To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> Subject: Re: [Emc-users] torque mode tuning yaskawa servo drives [EXTERNAL EMAIL] Be sure links are safe. Hey todd The drives are new old drives I found. The existing drives used mecholink control that is to hard to talk to and I had the spare drives sitting in shed for years. I paid 10 bucks each lol so that's good at least. The motors are existing. I have had to set up lots of stuff on the drives and the only thing that I had to tune them was the auto tuning function. Which was not that good. So far torque mode has been pretty good. But I might try two nested loops yet. Y axis is really good like max following error 0.04 at 16m/min X axis motor runs out of torque. And just can't keep up. I can set drive to push 300 percent rated torque through motor briefly. What do you guys think of that, is it OK? Factory default is set to 300 percent. I changed it to 100 percent On Thu, 2 Sep 2021, 02:10 Todd Zuercher, <to...@pgrahamdunn.com> wrote: > I have no experience tuning one of those drives. (but my experience > with torque mode was less than wonderful.) Just curious was your > machine a retro fit that was originally equipped with those drives, or > is it a new install of these drives? Were the drives velocity loops > tuned for your machine before you tried to use them? If they weren't > properly tuned for velocity command input on your machine it isn't > surprising that they may not work well in that mode. (While I haven't > tuned those drives for Linuxcnc, I do have a machine that uses them > with another control in I assumed velocity mode, I just haven't had to > mess with them.) > > Todd Zuercher > P. Graham Dunn Inc. > 630 Henry Street > Dalton, Ohio 44618 > Phone: (330)828-2105ext. 2031 > > -----Original Message----- > From: andrew beck <andrewbeck0...@gmail.com> > Sent: Wednesday, September 01, 2021 2:16 AM > To: Enhanced Machine Controller (EMC) > <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] torque mode tuning yaskawa servo drives > > [EXTERNAL EMAIL] Be sure links are safe. > > hey everyone > > got good news to report back here! > > i changed to torque tuning and its like 10 times better than velocity > tuning in these drives > > someone one the forum said that he was starting to suspect that the > velocity tuning on the yaskawa drives was really that bad so they > allowed a torque feedforward setting to fix it lol > > anyway my initial findings were torque control is awesome > > i will post back later with more tuning findings > > regards > > Andrew > > On Mon, Aug 30, 2021 at 2:57 PM andrew beck <andrewbeck0...@gmail.com> > wrote: > > > hey everyone > > > > i am trying to tune my yaskawa sigma 1 series servo drive at the > > moment and thinking about using torque mode for tuning. > > > > currently the process is auto tune drives to a rigidity setting and > > then control drives with velocity reference in linuxcnc. I am not > > getting the most amazing control and any P value over 8 means the > > drive starts vibrating. i have tried a range of rigidity settings > > in servo drive > > > > i have never set up linuxcnc to control torque mode and just > > wondering if what the correct way is? is it the same as velocity > > control in terms of the pid loops and hal layer? or is there > > another whole level of stuff i need to do > > > > and i saw that i needed to speed up the servo thread a bit to get > > better performance if using torque mode > > > > anyway let me know your experiences > > > > regards > > > > Andrew > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flist > s.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cto > ddz%40pgrahamdunn.com%7Ce5ffc4a4783848c1ce3408d96d92b329%7C5758544c573 > f47cebee96c3e0806fb43%7C0%7C0%7C637661299125087584%7CUnknown%7CTWFpbGZ > sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3 > D%7C1000&sdata=WUMqc5riOTPCc%2FJESAbkAJR6bDMkMXtls7rwQWAvcoM%3D&am > p;reserved=0 > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flist > s.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cto > ddz%40pgrahamdunn.com%7Ce5ffc4a4783848c1ce3408d96d92b329%7C5758544c573 > f47cebee96c3e0806fb43%7C0%7C0%7C637661299125087584%7CUnknown%7CTWFpbGZ > sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3 > D%7C1000&sdata=WUMqc5riOTPCc%2FJESAbkAJR6bDMkMXtls7rwQWAvcoM%3D&am > p;reserved=0 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Ctoddz%40pgrahamdunn.com%7Ce5ffc4a4783848c1ce3408d96d92b329%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C637661299125087584%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=WUMqc5riOTPCc%2FJESAbkAJR6bDMkMXtls7rwQWAvcoM%3D&reserved=0 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
