On Wednesday, July 21, 2010 03:16:09 pm Andy Pugh did opine: > On 21 July 2010 15:27, Mario - Promm <ma...@promm.com.br> wrote: > > The other options could be use the WEG 0-10 V input or its electronic > > potentiometer (one pin that increase rpm and other that decrease). It > > hasn't a PWM input. > > PWM to voltage is fairly easy (a resistor and a capacitor). > > Alternatively, you could drive the electronic potentiometer with a > stepgen function in HAL. There is a stepgen (type 1) that outputs the > correct pulse type. There is no rule saying that stepgen has to take > position input and drive a stepper motor, the code doesn't care and > would happily take a spindle speed input and output digipot pulses. > http://www.linuxcnc.org/docview/html//man/man9/stepgen.9.html > > PWM is possibly better, as when the PWM stops the spindle stops. That > might not be the case with the digipot.
And that can be a life & death matter. -- 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) Machines take me by surprise with great frequency. - Alan Turing ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
