Greetings; I'd like to be able to use that quad pack of TB6560 based stepper drivers with these nema 17 driven harmonic drives I'm cobbling up.
But, these things are dumber than a rock in that they have a 4 step current adjustment, but no provision for an idling current turndown. And at full current, their heat will kill these harmonic drives. The current adjustments are the right hand pair of dip switches, taking it from about 750ma when down to about 2.2 amps when both are up. They feed two pins on the tb6560, with what looks like logic levels. And ANAICT, the response to flipping the switches is instant, no powerdown reset needed such as the bigger drives like the 2M542's need. I have I/O to do these with, so that isn't a concern. Developing the signal is. I'd hit both pins with the same signal, with the idea of banging the motor at the full 2.2 amps only if its moving, and turn it back down 50 millisecs after the last step to get it where we sent it to has been issued. Is it possible to get an enable signal, per axis, from the mesa cards that would become true, hopefully a couple micky-secs ahead of the first stepper pulse so no missed steps would normally occur, losing its home, and go back false when the last step has been sent? It maybe could be timed right if it actually steps on the trailing edge of the pulse, and the enabling action was on the leading edge. Can this be done? Thanks. 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
