On Dec 12, 2006, at 2:07 AM, Kasparov, Aram wrote: > Hi Dave > > I am using MESA 5i20 card. Is any difference in tune up process > makes type of card that in use? (MESA vr VITAL) Not that I know of. Tuning in velocity mode is a bit different than tuning in torque mode but the goal is the same. > > > Also, what is exact definition of "oscillate"? to move back and forth in a periodic manner as in a pendulum; sine wave. > > Any motion of motor should send some signals and oscilloscope > should show waves. If oscilloscope can't show wave it means that > oscilloscope is not sensitive enough. > plotting position vs time should give you a nice sine wave at a given frequency. > So, can I say that oscillate means any motion of motor? No, motion in one direction is not oscillation; only when it goes back and forth.
If P is set low you will get no motion; as you increase P the axis should get more and more jittery. Finally it should sustain back and forth motion. Don't do this too long; just long enough to make certain it is not going to dampen out. Then multiply the P that produced that by 0.6 and that is a starting value for P. When you are doing this I and D are both set to zero. After that works then go adjust FF1. That is my way of doing things. Others have different procedures and they work also. > > > > I am now moving to final stage of start putting controller/ > retrofitting Bridgeport machine for place where I am working. > > What is min. torque needed to move X-axis of Bridgeport mill? I > will use 1 to 6 timing belt reducer. I don't really know. Jon Elson can probably give you a quantitative figure. 6:1 seems like a pretty high ratio. I tried 4:1, 3:1 and finally settled on 2:1 with SEM HT-30-H4-44 brushed servo motors. It has enough power to go 150 ipm which is about all one can get out of that type of way. > > Are any suitable motor from servo dynamics for that type of job? http://www.servodynamics.com/MT30.html If you want to go brushless then I have to experience. Hope this helps. Dave > > > > Thanks > > aramk > > > ________________________________ > > From: [EMAIL PROTECTED] on behalf of Dave > Engvall > Sent: Fri 12/8/2006 10:13 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Tune-upn AC servomotor > > > > Hi Aram, > > A couple of things come to mind. > Check your servo amp with 9-10 vdc on the input.... a nine volt > battery is handy. :-) > The axis should move out smartly, close to the maximum velocity you > want. > If it doesn't then adjust the gain on the amp until it does. > > After that is verified then go back to tuning emc. IIRC typical P > values for the Vital card are in the low thousands. > Work toward getting P set at 0.6 times P when the axis just sustains > oscillation. Leave it there while you work with other parameters. > > As for the halscope stuff: try getting on irc ... freenode.net #emc > and you should be able to get help. > > Dave > On Dec 8, 2006, at 9:30 AM, Kasparov, Aram wrote: > >> Hi Dave. >> >> I am trying to see any wave type graph on oscilloscope but I can't. >> >> I star machine with very slow motion f0.01 in order to have enough >> time to start oscilloscope, load them up as it described in manual. >> >> I loaded signals: >> >> sig Xpos-cmd (position command) >> sig Xpos-fb (position feedback) >> pin pid.0.error (position error) >> sig Xoutput (PID loop output) >> >> I only can see one yellow line and two read ones. >> >> If I reduce P to 20.0 then I can't see yellow line at all. >> >> I increased P to 583 (randomly pick that figure) and machine moves >> very slow no matter how big F feed I put in. >> >> When P is small than machine moves faster indirectly from volume of >> F feed. >> >> >> >> Am I doing something wrong? >> >> >> >> Thanks >> >> aramk >> >> > > <winmail.dat> > ---------------------------------------------------------------------- > --- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to > share your > opinions on IT & business topics through brief surveys - and earn cash > http://www.techsay.com/default.php? > page=join.php&p=sourceforge&CID=DEVDEV________________________________ > _______________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
