>On Monday 01 June 2020 01:02:01 Gene Heskett wrote: > >> On Sunday 31 May 2020 22:58:31 Chris Albertson wrote: >> >> Second, my testing for motor heating may not have been close enough to >> stopped as I was just turning the speed down to about a tick a second >> from the generator which may not have been long enough to cause a >> current turndown. So I'll plug it in w/o any drive for a hour >> tomorrow to see if it still gets that hot. Maybe watch it with a >> kill-a-watt?
>With the kill-a-watt watching the supply, its 16 watts when warmed up but >truly stopped. And does not increase when its moving at <10 rpm. I think >that >says it doesn't do a stopped current turndown. >Playing with the function generator, it was up to about 45 watts for the whole > kit at an estimated motor speed in the 4k rpm territory, but all it took to >error the drive was a finger touch on the shaft. In red led on mode the driver >shut down the draw to about 3.5 watts, but was holding the motor a wee bit. >In that event, "home would be lost" since it takes a powerdown reset to >recover. >So I will arrange for the alarm output signal to do an unhome. >At about 2k rpms, the draw is about 30 watts. And torque was abundant. >I can also, using that alarm signal, throw up a red led in the axis gui. >Probably should make it blink too since thedrivers led doesn't. These are closed loop steppers right? I thought regular steppers without current reduction drew the most current when stationary then decrease with speed because of the back EMF. So obviously these drives are reducing the juice drawn when not needed (16watts@0rpm vs 30watts@2krpm.) It might be interesting to do the same test with your Kill-A-Watt on a regular stepper. Todd Zuercher P. Graham Dunn Inc. 630 Henry Street Dalton, Ohio 44618 Phone: (330)828-2105ext. 2031 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
