Hi There are a lot of information about tune up ac servomotor. On internet in many books. Problem is unless you have electrical engineering degree or extended training in that are of science it is hard to implement those information while working on EMC2. Steps that I describe from book are not Z-N. That steps more generic type as far I can see. Many people that use EMC2 dont have electrical engineer degrees or special training and for them implementation of those generic info about tune-up that on the internet and book will be problem.
What about instruction for tuning servomotor specifically adapted to EMC2 case? Use EMC2 Hal Scope setting, Calibration window, etc I think that type specific instruction will be much more helpful to average EMC2 user. aram > 2009/6/25 <a...@conceptmachinery.com>: > >> Sequences 1-3 very clear. >> Sequence 4 means increase D until graph will be represent with line >> and >> not with line that has noise (vibration type). >> Am I right here? >> Sequence 5. What is mean instability? Is this same as an oscillation? > > Yes, exactly, > >> I know what oscillation means, but what instability is and how it will >> be >> represented on Hal Scope. > > In this context they are much the same thing, though perhaps different > in detail. An oscillation is probably meant to describe a periodic and > increasing failure to meet a step change in the setpoint, and an > instability might be random variations in a position when there is no > change in setpoint. > > You seem to be describing Ziegler- Nichols tuning, and a google search > on those words should help with more detail. > http://en.wikipedia.org/wiki/ZieglerNichols_method as a starting point > > However, Z-N tuning is most effective for symmetric systems, you might > still get better performance with hand tuning from those base points. > My personal experience is "Beware of D" especially in any system with > backlash. > > [Irrelevant detail] in my real job we run controllers where P I and D > are themselves functions of other things, including noise factors such > as fuel temperarature and simple factors such as distance from > setpoint. PI and D are not the be-all and end-all of control, and if > that is all you have then perfection (and indeed adequacy) might be > unobtainable) > > -- > atp > > ------------------------------------------------------------------------------ > _______________________________________________ > 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
