On Nov 30, 2008, at 8:27 PM, tomp wrote:
> Kirk > > Kirk Wallace wrote: >> On Sun, 2008-11-30 at 20:20 -0700, [EMAIL PROTECTED] wrote: >> >>> Hi >>> I reduced Default_valacity =1. >>> Max_velacity =2.0 >>> Default_acceleration = 2.0 >>> Max_acceleration =3.0 >>> >>> The picture is: >>> www.conceptmachinery.com/Sh12.jpg >>> >>> >>> >>> I reduced most of them by 2-3 times and graph looks good. I will >>> post it >>> in 20 minutes. >>> I am interesting why my drive can not output more voltage? >>> Not power enough? It is SD-94 8 amp constant from servo dynamic >>> http://www.servodynamics.com/sd94p_servodrive.html >>> thanks >>> Aram >>> >> >> This drive has its own PID feedback built in. You may need to decide >> which PID loopback system you want to use, EMC2 or servo drive. I >> would >> go with a "dumb" motor amp myself. Or, others here have a way to deal >> with "smart" drivers. Or, I may be, all together, off base. >> ------------ >> Kirk >> http://www.wallacecompany.com/machine_shop/ >> >> >> >> --------------------------------------------------------------------- >> ---- >> This SF.Net email is sponsored by the Moblin Your Move Developer's >> challenge >> Build the coolest Linux based applications with Moblin SDK & win >> great prizes >> Grand prize is a trip for two to an Open Source event anywhere in >> the world >> http://moblin-contest.org/redirect.php?banner_id=100&url=/ >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> > you're right > often a cnc control loop will fight a driver control loop > because there's 2 loops controlling one process > and one must be dummied up so the other can be boss > and usually the cnc control cannot be dummied > so the driver P gain gets 'weakened' ( i and d may get nulled so the > driver is basically P ) > > anyway > you mention a 'dumb' driver > anything you know of for AC drives? > i've done this with lots of copley's > but those were dc brushed amps > thanks > tomp > > Hi Tom, Yes, I think that is exactly the idea. Use only P ( on the drive) and lower P to the point where the drive needs between 9 & 10 volts to go max velocity. Set other parameters to zero and then start tuning the P and FF1 in emc, then go on from there. If that doesn't work then have a conversation with Servo Dynamics; I've always found them to be very helpful. Dave > ---------------------------------------------------------------------- > --- > This SF.Net email is sponsored by the Moblin Your Move Developer's > challenge > Build the coolest Linux based applications with Moblin SDK & win > great prizes > Grand prize is a trip for two to an Open Source event anywhere in > the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
