On Sat, 26 Sep 2009 15:41:11 -0400, you wrote: Hi John
>One thought just occurred to me - you are using pwmgen, but in your >message you talk about frequencies like 23.4KHz. pwmgen is NOT intended >to generate any specific frequency. It generates a duty cycle that you >filter into an analog value to run your VFD. It will choose whatever >frequency lets it get closest to the desired duty cycle, given the >constraints of software generated PWM with a relatively slow "clock". I was only using the readout on the VFD as it was convenient, PWM is converted into a 0-10V output using hardware. 50kHz relates to 10V input to the VFD, top speed for that pulley is 1100rpm or so, so 23.4kHz is about right for 500rpm. What that seems to be telling me is EMC is putting out a pwm signal, when I don't think it should be. >Anyway, take a look at things with halmeter and/or halcmd. Something >like "halcmd show pin pwmgen" will show all pins associated with the pwm >generator, and "halcmd show param pwmgen" will show the parameters. > >Post your results (especially halcmd show output) if you need more help. Will do. Thanks Steve Blackmore -- ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
