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
