Hi Viestus. The fact that you reduced the P gain from 400 to 15 it's strange (it is a big change). Do you see any change after P gain modification (the noise frequency change) ? How is the mechanical coupling made ? Is there any backlash on the coupling ? If the motion is made by ball and nuts screw how is the machanical status of it? Maybe due to a not perfect mechanical alignement or electronic tuning between the two sides of the gantry on the "bad" side there is a machanical stress that "damage" the screw. If I'm saying something stupid excuse me :-) .
bigalex On Thu, Jun 20, 2013 at 3:34 PM, Viesturs Lācis <[email protected]>wrote: > Hello! > > I have spent hours in plural trying to figure out, what is wrong and this > is driving me nuts. > Here is a video with that motor in action (I was jogging it back and > forth): > http://www.youtube.com/watch?v=RA4mdp1rYfs > > That noise starts at 0:14. > 1) it is there only when moving to the right; > 2) it is the only motor doing such a noise; it is a gantry machine, motor > on the other side and the motor that sits on the gantry are fine; > 3) PID tuning of these motors was done 2 years ago, problem started few > weeks ago (according to client); I retuned PID today, difference in > parameter values can be expressed in orders of magnitude (P was 400, now it > is 15 etc.) > 4) I watched encoder velocity pin in HalScope, it is fluctuating, so that > comes form motor; > > Is it some mechanical problem? Is that encoder? I would appreciate any > tips, where to look. > > Thanks in advance! > > -- > Viesturs > > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by Windows: > > Build for Windows Store. > > http://p.sf.net/sfu/windows-dev2dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
