On Friday 23 March 2018 18:29:29 a k wrote: > Hi > When you said wide pin, > Do you mean pin that looks like round /cylindrical shape? > And there also 2 flat shape pins.
The round pin is the static ground. The wider of the two flat pins is the neutral. The narrower of the two flat pins is the hot wire. > On Mar 23, 2018 3:00 PM, "Gene Heskett" <ghesk...@shentel.net> wrote: > > On Friday 23 March 2018 17:04:51 a k wrote: > > > hi > > > i reassemble my lcnc mill, and i found that axis move by them > > > self. i think it is something to do with static electricity. > > > i found ground - and when grounded lcnc body of machine - breaker > > > turn off. i measure with dc voltage between machine and ground 2. > > > vdc and when i measure ac voltage between lcnc machine and ground > > > it was 35 v AC. > > > > > > i know that when use real ground like a water pipe and ground in > > > outlet there always will be current they always be 30 v ac. > > > can it cause problem? > > > > Yes, probably by blowing "pins" on the interface card. Most of this > > stuff is 5 volt, or 3.3 volt. 30 volts will blow it. > > > > You either do not have a useable static ground on your machine or > > its wired wrong, machine or building to be determined. I've had to > > correct a goodly number of so-called static grounds made up by a > > carpenter that knew nothing about the NEC code book and treated them > > as > > interchangeable. > > > > Static grounds are to be bridged to powerline neutral ONLY at the > > building service entrance according to our NEC. If you are not > > capable, get an electrician who is. There is no shame in doing so. > > > > Basically, with that single connection opened in the service, and > > the building entrance breaker opened, there should be no continuity > > between the static ground and anything that is the wide pin of a > > wall socket, or to an earthen ground. The building, if you have > > continuity to the narrow pin of a wall socket, make sure everything > > is turned off first, but the person who wired it, maybe 40+ years > > ago, is color blind. And you stand a good chance of being shocked, > > or worse... > > > > Connected back up, but the breaker still off, you should get not > > more than an ohm, maybe 2 ohms, between the static ground and the > > neutral (wide pin) of a wall socket, any and all places in the > > building. > > > > Good luck. > > > > > thanks > > > aram > > > ------------------------------------------------------------------ > > >---- -------- Check out the vibrant tech community on one of the > > > world's most engaging tech sites, Slashdot.org! > > > http://sdm.link/slashdot > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > -- > > 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> > > > > ------------------------------------------------------------ > > ------------------ > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users -- 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> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
