On Sunday 27 December 2020 13:42:57 andy pugh wrote: > On Sun, 27 Dec 2020 at 18:31, Gene Heskett <[email protected]> wrote: > > pd054=0 which is supposed to be an analog voltage from 0 to 10 > > volts, representing 0 to 400 hz from the invertor. > > > > But the output is actually a 10v p-p pwm corresponding to the duty > > cycle to get that % of a pwm. > > Which would presumably drive a moving-coil meter entirely adequately. > > It sounds like it just needs an RC filter to turn it from PWM to > analogue voltage.
Its a pretty slow wave, would seriously shake the needle of an analog moving coil meter. Its as if its stuck in some mode from 4 to 7, which is a rate scaled in the op-freq of the vfd. 1-3 are analog versions of the a list of output current, bus voltage and output voltage. And its set for 0. The text says: 0:~10V analog output, corresponding to output frequency. 0~10V corresponds to 0~Maximum operating frequency. 1: 0~10V representing output current 2: 0~10V representing bus voltage 0~1000 volts 3: 0~10V representing AV output voltage 4~7: Pulse Output, scaled 1,2,3,6 pulses per op freq /hz, with a 50% pulse duty. One could filter (long sigh) it I suppose, but to get a steady reading would certainly impact its response time. And that would be no more informative that just feeding the tach from the command which is what I am doing now. Both of these also ignore "slip angles" which the vfd can compensate for. But, I have a job for it, and it will run the way it is. I bought a box to put the BS-1 servo psu and driver into and its not as roomy inside as advertised so I will need to make new end caps and extension side walls to make it at least 1/2" taller, maybe even 3/4". Should be fun, not. Grrrr. 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
