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 ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
