So the DC motor is seeing roughly 50 amps at stall? What is the motor rated at? Is there a maximum current stamped on the data plate?
What is A1 and A2? Are these the supply and ground return? If so how could they not be equal? Maybe your meter is only good to plus or minus 10% It would also be good to look at PWM duty cycle vs load on the spindle. So you can understand what the controller it doing. It is best to real a real scope or logic analyzer but if you don't have that the halscope is likely good enough On Tue, Jul 27, 2021 at 11:46 AM Earl Weaver <[email protected]> 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. > 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. > > 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 > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
