Your DM542 seems to be very different from mine. I have the normal Leadshine type driver and the function of each switch is printed on the cover. There are 8 switches and switch 4 is the "half current when not moving" switch.
On Mon, Aug 10, 2020 at 2:46 PM Gene Heskett <[email protected]> wrote: > I have a stack of 4 of these I took out of my 6040 when I found they > didn't move it all that well, but it turned out the psu was duff. Any > way. my box of a 28 volt multi supply and 4 DM542's are running it just > fine. > > As you know by now, I'm playing at makeing some harmonic drives which are > sized for nema17 motors. So this looked like a good was to use 2 or 3 of > these drivers, IF I could figure out how to run them. > > These have a 7 position dip switch. > > S1 and S2 are the divisor mode switches, > HH=2WI-2-phase mode, or /32 > LH=4WI-2-phase mode, or /16 > HL=1-2-phase mode, or /8 > LL=2-pase mode, or /4 > > S3 and S4 are decay mode, or how many clocks to reduce current to zero. > Not sure I understand that. > > S5 and S6 are motor current, but its not in amps. Top amps is set by > those two white resistors reaching a .5 volt drop. They are .22 ohms on > mine so top current is around 2.2 amps. But with those set LL for 100%, > both these motors and the main chip get burn your fingers hot in 15-20 > minutes. But that is in logic levels, so the switch gets > 75% for LH in logic > 50% for HL in logic, > and 20% for LL > > S7 is still a puzzle, but may be a default direction. However, even a > power down reset does not seen to have any effect on the motors > direction after throwing that switch. > > Step-dir timeing is a bit leasurely, fastest step is listed as 10 u-secs, > but I've run it with a function generator at .5 megahertz. Easily > stalled, but it does run. > > Power saving can be done but you'll have to cobble up shutdown and > startup timers in your hal file. If you don't want it to lose steps, > your must disable via the reset input and re-enable it, waiting a few > microseconds for it to turn on its outputs and it will then continue > where it left off. If you shut off the outputs with the enable signal, > it still responds to a step signal internally, and you and linuxcnc lose > track of where it is. That can't be good. And using the reset mean no > static load allowed as it will coast. So leaving it at set current can > be done with nema-23's and bigger, but these 17's will get too hot for > plastic drive parts at more than 20% of those 2 switches. > > Thats all I know ATM. Hope this is some help, since these can be had for > under a tenner each. > > 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 > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
