On Wed, 2007-12-26 at 20:21 +0100, Geert De Pecker wrote: > Kirk, > > > The C11 document specifies three power supplies. One computer side +5V, > > one CNC side +5V @ 2A and One CNC side +12V @ 300mA. I would think if > > you have satisfied these specifications, you should be okay. 12V should > > have enough headroom to regulate to 10 V and the VFD should only draw a > > few milliamperes at worst. Ops I forgot, you are going into the Sherline > > speed control, so I don't know what it draws. It shouldn't be drawing > > much anyway. You may want to make sure you are getting at least 22kHz > > We need a separate supply: the analog voltage controller on the C11 is > isolated from the other circuitry because in the case of the sherline, > the speed control voltage is connected to the live mains. > > > (24kHz - ~10%) into the C11. You could setup HALscope to look at the > > siggen output and count the rising edges over a time period. If you are > > running siggen in the servo thread, my guess is that, you will only get > > into the 2kHz range. With my DAC project, I have just run into "FP > > needed" errors and computer lockups while trying to run HAL components > > in the base thread, so I need to learn more about what will run in the > > base thread. pwmgen will, but I don't know enough to guess at how to > > make it act like a variable frequency pulse generator. Another thought > > comes to mind. If you are only getting 2kHz out of siggen then maybe you > > could step up the frequency with a PLL. I have never used a PLL, but I > > think this is what they are supposed to do. Ideally, it would be nice to > > have a pulse generator HAL component. With the proper knowledge, I > > suppose it would not be too difficult to make, but that is like saying, > > if I had enough money, I'd be rich. > > > > At 400Hz I get the max voltage out of the analog voltage part. So this > is ok. I'll try with stepgen just to know if this works. > > Geert
I checked the siggen setup on my test system and 480Hz was the highest frequency I could get. Running in the base thread seems to be the only way to get a decent frequency out. Well, now I know. -- 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
