On Wednesday 28 September 2016 17:09:36 andy pugh wrote: > On 28 September 2016 at 20:57, Gene Heskett <ghesk...@shentel.net> wrote: > > So how to satisfy this vfd? Needs a positive speed pwm, and a > > positive for run fwd, and a positive for run reverse, presumably > > mutually exclusive. > > VFDs norrnally need their inputs pulled down to their own digital GND. > (Have you tied BoB GND to VFD GND?)
No, I haven't yet. I have no clue whether the "power source ground" is in fact connected to the 3rd pin since for single-phase operation it is supposed to have terminals L & N, but they are missing, and when asked I was told to just use any 2 of R-S-T. Which is how I've been playing with it, but I've not checked to see if the static drain is actually connected. My back's yelling atm as I've been standing up most of the day messing with the computers hal config, and I believe I have that sorted, finally. After I've done dinner, I'll see if I can take some dvm measurements to make sure its actually safe, and check to see what the resting voltage is to its power source ground from the fwd and rev terminals. It doesn't say, so I assumed it needed a pullup, not a pulldown. Its a real informative little booklet, not! Even the units picture on the cover is wrong. The block diagram seems to indicate at lease one opto-isolation stage. So maybe its fully isolated. It wasn't on my radar with the hal problems earlier. Thanks Andy. And post what I've found of course. 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> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
