On Thursday 02 July 2009, Jeff Epler wrote: >On Thu, Jul 02, 2009 at 08:41:23AM +0200, Denis Stremplewski wrote: >> Hi, >> Does exist a way for automatically shutting off the power of the motors at >> the end of a program (something like Mxx), in order to avoid a self >> heating of the motors ? > >You don't want to do this. > >In a stepper system, any time you turn off the amplifier you risk losing >position. That's because when you turn the amplifier back on, even if >it powers on in the same phase as it powered off, it might pull in to a >spot +-4 full steps from where it was powered off. Furthermore, there's >no warning before an interactive jog can begin, so you can't make sure >that the amplifier has had a chance to turn on before the first step is >made. Any time the amplifier is turned off in a stepper system, you >should assume that you have lost position and need to re-home and/or >touch off again. > >Instead, follow your motors' datasheet maximum current and case >temperature limits, and live with the fact that a stepper gets hot to >the touch even when operated properly. > >Jeff
I will 2nd Jeff on this, if you have a job going that needs x copies made, zero them for the job & let them get warm for the duration. I only power mine down when it truly is not doing anything, knowing I will re-zero them for the next job. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> You can't erase a dream, you can only wake me up. -- Peter Frampton ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
