Just to confirm also Gene.
My vfd only holds the motor at full torque to resist loads briefly. So it never actually causes problems I think the rating is 1min at the 150 percent rated torque. So it's only to respond to forces and make a good fast pid loop Not to run that way all the time On Tue, 13 Jun 2023, 16:19 Leonardo Marsaglia, <ldmarsag...@gmail.com> wrote: > > > > Wrong atribution Leonardo. It was posted by Andrew Beck, I was just > > commenting that it appears Andrew was overdriving the motors a bit. > > > > That's ok Gene :) > > I just wanted to clarify because some older Fanuc spindle drives (the mazak > that's from 1983 had one of those) worked with 0-10 volts for speed command > and are easy to replace. But these apparently are not that friendly. I > would love to install LCNC on this lathe like on any machine, but that > would take several weeks easily so It's not the happiest option at the > moment. > > El mar, 13 jun 2023 a las 1:05, gene heskett (<ghesk...@shentel.net>) > escribió: > > > On 6/12/23 22:58, Leonardo Marsaglia wrote: > > > Guys, just to clarify, the control is still Fanuc, not LCNC. So I need > to > > > interface with the Fanuc control. Also, the drives on this lathe are > all > > > using serial communications (the lathe is from 1997) so I think it's > not > > > that easy to replace an original drive for a non Fanuc one. That's why > > I'm > > > just hoping there's some kind of interface to convert the signals > from/to > > > the fanuc control to use a standard VFD. If not, I guess I'll have to > > > replace the drive entirely and try to repair the one that's not working > > > without the rush of getting the machine working again. > > > > > > El lun, 12 jun 2023 a las 17:36, gene heskett (<ghesk...@shentel.net>) > > > escribió: > > > > > > > Wrong atribution Leonardo. It was posted by Andrew Beck, I was just > > commenting that it appears Andrew was overdriving the motors a bit. > > > > >> On 6/12/23 15:58, andrew beck wrote: > > >>> Leon I use a cheap Chinese vfd costs about 190usd > > >>> > > >>> And buy a encoder for it. About 50usd and I'm controlling two fanuc > > >>> spindle motors here fine. > > >>> > > >>> They auto tuned the motor in about 4 secs and run awesome. > > >>> > > >>> I can get 150 percent torque at zero rpm. If I run a pid loop in > > >> linuxcnc > > >>> almost a servo level control response > > >>> > > >>> Have a look at the video there are links on there. I made it a few > > >> months > > >>> ago > > >>> > > >>> https://youtu.be/vARlybdtC6Q > > >>> > > >>> I'll message you in WhatsApp too. > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > did you get that msg? > > >>> > > >>> On Tue, 13 Jun 2023, 07:40 Leonardo Marsaglia, < > ldmarsag...@gmail.com> > > >>> wrote: > > >>> > > >>>> Forgot to attach a picture of the label on the spindle drive. Sorry. > > >>>> > > >>>> El lun, 12 jun 2023 a las 16:33, Leonardo Marsaglia (< > > >>>> ldmarsag...@gmail.com>) > > >>>> escribió: > > >>>> > > >>>>> Hi guys, I hope you're all doing well > > >>>>> > > >>>>> Sorry for the OT but we have a problem with a Daewoo lathe and as > > >> always > > >>>>> this is the first place I think of. > > >>>>> > > >>>>> So, this morning the lathe started up as always, but when we > selected > > >> the > > >>>>> gear to validate the spindle movement the screen showed a 409 SERVO > > >> ALARM > > >>>>> and the spindle drive on the back was showing alarm number 12. From > > >> what > > >>>> I > > >>>>> could find on several forums this is an overload alarm and in the > > worst > > >>>>> case scenario the IGBT firing module or the IGBT module itself > could > > be > > >>>>> damaged. > > >>>>> > > >>>>> Is there any way to check this in an easy manner? > > >>>>> > > >>>>> Also, is it possible to adapt a normal VFD in case this is the > > >> problem? > > >>>>> Because maybe there are some Fanuc Serial protocol to analog > voltage > > >>>>> converters (I'm just wishing such an adapter exists) that could be > > >> used. > > >>>>> > > >>>>> Thanks as always for your help! > > >>>>> > > >>>>> Leonardo > > >>>>> > > >> Might be ok for short term operation, Leonardo, but 150% at zero rpm > > >> tells me the vfd's max low speed boost exceeds the motors FLA, aka > Full > > >> Load Amps. The vfd should have a variable to fix that. Most do > > >> anyway.. Also, most vfd's will have a minimum hz setting which should > > >> turn off the drive below around 10% of 60 hz. I have mine set to > > >> disable at 5hz. I can do 5.5 for half an hour and still lay my hand on > > >> the motor w/o burning it. Who needs a backgear? > > >>>> _______________________________________________ > > >>>> 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 > > >> > > >> 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 > > >> Genes Web page <http://geneslinuxbox.net:6309/> > > >> > > >> > > >> > > >> _______________________________________________ > > >> 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 > > > > 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 > > Genes Web page <http://geneslinuxbox.net:6309/> > > > > > > > > _______________________________________________ > > 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
