On Tuesday 27 July 2021 14:43:49 Earl Weaver wrote: > Ok, Here is my attempt at taking amp readings. > I attached my AC Clamp Meter to lines A1 and A2 going from drive to > motor.
But you are trying to measure a poorly filtered DC at that point and a clamp on meter ignores the DC component. Or did you break the circuit, and connect the leads of that meter to the ends of the break? > Running no load: 4.9 > Original Pot Setting: A1=41.9 & A2= 42.6 > Full Pot Setting: A1= 47.3 & A2= 51.5 > At full Pot Setting it trips the breaker on the drive when it stalls. This could be a clue. if you can measure the DC current going thru the field winding, the one labeled 3 amps, and finding a place on the speed pot where the current drops to almost nothing, you just found your problem. I have my doubts, but as a loooong term CET, I've learned that anything is possible. > On 7/27/2021 1:06 PM, Earl Weaver wrote: > > On 7/27/2021 12:13 PM, andy pugh wrote: > >> I skimmed the drive manual looking for any info on tuning the > >> velocity loop, but could ne see anything. > >> However: Are you sure that your tachometer is set up right? (I > >> think it probably is or speed would be way off) > >> And is the current limit pot set to suit your actual motor? > > > > The manual that I linked is not an exact match to my drive. I > > searched but did not find an exact match , but this one is close. > > Yes, I believe the tach is set up right. I can get the speed control > > to work good. It's just the power at low RPM is the biggest problem. > > Your description from an earlier post describes it perfectly. > > "I would expect a speed-controlled loop spindle to feel springy. As > > you move the chuck faster than commanded speed the drive will reduce > > the current to try to slow the spindle (maybe even reversing in to > > braking) > > Then as you wobble it back the other way it will take some time to > > wind up the other way." > > I will check the current limit pots to see if that is limiting the > > torque. > > > > **Earl Weaver > > Email: [email protected] <mailto:[email protected]> > > > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
