On Wednesday 15 February 2017 14:13:17 Valerio Bellizzomi wrote: > On Wed, 2017-02-15 at 12:45 -0600, dragon wrote: > > The 20ma control circuit on the VFD is an analog control, where as > > the parallel port pin is a digital (on/off) signal. You will need > > some sort of hardware interface between the two to do a digital to > > analog conversion. > > is there a list of supported hardware, that I could buy on ebay ? > I was looking at > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?LinuxCNC_Supported_Hardware > > I have already 3 stepper drivers mounted in a metal box with their > power supply, I would need only a small interface for the spindle.
Using software stepping? I'd still use a pwmgen module in the computer to drive the vfd, but I'd put a SpinX1, from Mesa between them, for the noise isolation (vfd's are noisy electrically), and the control is quite linear. I would put the pwmgen in the PDMgen mode, see the man page as that removes the need to dither the pulse width because each step is fixed, the dither keeps it at the requested speed. But with PDM, you don't need the dither. With SW pwmgens, I'd choose a refresh rate below the servothread by about half, the vfd shouldn't mind. > > > On 02/15/2017 12:36 PM, Valerio Bellizzomi wrote: > > > On Wed, 2017-02-15 at 10:22 -0800, Kirk Wallace wrote: > > >> On 02/15/2017 09:25 AM, Valerio Bellizzomi wrote: > > >>> Hello, > > >>> > > >>> I have an Toshiba vfd which has a current signal input (max > > >>> 20mA), is that compatible with linuxcnc to be wired to S gcode > > >>> command ? > > >>> > > >>> > > >>> Thanks. > > >> > > >> Briefly, mostly yes. > > >> > > >> The S word has an associated HALpin. This HALpin can be HAL > > >> connected to another HALpin that handles the hardware that can > > >> affect your VFD speed > > >> > > >> function. So: > > >>> S word --> S word HALpin --> 20ma HALpin/20ma HALcomponent -- > > >>> 20ma hardware ^^ g-code/MDI -- .hal configuration file -- HAL > > >>> .comp component file -- wire from hardware interface to VFD > > >> > > >> In other words, LinuxCNC already has a S word HALpin that you can > > >> use to connect your 20ma interface to. You would need to decide > > >> what hardware you want to use and look for or make the HAL > > >> component (software). > > > > > > I am not aware of any interface hardware , I thought to wire one > > > parallel pin to the vfd, but I might be wrong. > > > > > > suggestions? > > > > > > > > > > > > > > > ------------------------------------------------------------------ > > >------------ Check out the vibrant tech community on one of the > > > world's most engaging tech sites, SlashDot.org! > > > http://sdm.link/slashdot > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > -------------------------------------------------------------------- > >---------- Check out the vibrant tech community on one of the world's > > most engaging tech sites, SlashDot.org! http://sdm.link/slashdot > > _______________________________________________ Emc-users mailing > > list Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
