Yes, exact. The goal of my question was to reduce the power consumption (save the planet !!), because I am not always in front of the machine (I know it is bad to do that !), I am not informed when the job is terminated and the motor are energized often for a long time. If it is not possible by a software way, I will use the "spindle off" signal for reduce the current in the motors, or shutting down the motor (I know, I will loose the position)
Denis ----- Original Message ----- From: "Jeff Epler" <[email protected]> To: "Enhanced Machine Controller (EMC)" <[email protected]> Sent: Thursday, July 02, 2009 1:59 PM Subject: Re: [Emc-users] power off at the end of program > 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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
