There are so many pots and boards on this amp. Where to start? I will visit with Randy about it. Maybe we could do something similar. He mentioned taking a couple boards out and using jumpers. After the comp is fixed I will try the tuning. If it is still lacking in performance maybe a collaboration would be in order. :)
On Wed, Oct 8, 2008 at 11:00 PM, Chris Radek <[EMAIL PROTECTED]> wrote: > On Wed, Oct 08, 2008 at 10:32:47PM -0500, Stuart Stevenson wrote: >> Can I effectively bypass the SCR tuning by increasing the gain a >> lot (much past what the motor can handle) and using the tuning in EMC >> to control the motor. Could this turn the SCR into a dumb amp. > > I think increasing the gain will not work but unhooking the tach > might. I ran one of mine that way for a while. The performance was > not better - it was worse. I was not able to tune the position PID > loop to give the same stability and stiffness that the amp was able to > do by itself with velocity feedback. > > My understanding is the way these work is the input to the next stage > in the amp (current/torque loop?) is the difference between commanded > and feedback velocity. So if you null the feedback you control the > next stage fairly directly. > > In my limited experience, velocity mode is still best. I measured the > amp's behavior (tuning is set with resistors, etc) and then set EMC > accordingly (maxvel, maxaccel) and tuned with pretty much P/FF1 only. > It really works great. > > > ------------------------------------------------------------------------- > 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
