On Tuesday 11 August 2020 00:12:05 Chris Albertson wrote: > Your DM542 seems to be very different from mine.
Read the subject line Chris, this is not about the DM542, this is the el-cheapo gismo you might salvage from making a 6040 gantry mill and its ilk actually work. These came out of the 6040's control box, with the box and vfd in it now living in my trash trailer until I get to the landfill. All the dipswitch references below are or should be applicable to boards marked TX14207. > 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 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
