On Mon, 2007-12-24 at 14:11 +0100, Geert De Pecker wrote: > Hi all, > > I installed a CNC4PC breakout board that has an analog voltage output > available for spindle speed control. However, this board works based > on a frequency to voltage converter and not like standard emc duty cycle > generated by pwmgen. > > I was looking into using siggen to create a speed controlled frequency, > but it seesm this function is mostly for testing. > > Anybody knows what the best possibilities/options are? > > Regards and happy ending, > > Geert
A common problem with pwmgen and seggen is that they use the parallel port, which has a limited bandwidth. I tried controlling my 0 to 10 Volt VFD with a parallel port PWM and RC filter, and found that a decent filter slowed the change in signal to a second or more. Typically, you need an external device that can produce much higher frequencies. The parallel port is much better at transmitting data. So for my VFD's , I started work on a 0 to 10 Volt DC analog DAC board here: http://www.wallacecompany.com/machine_shop/EMC2/serial_dac/ -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending) ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
