Make sure that you have not connected 0V to Gnd anywhere in the system. This will cause problems with the switching power supplies. 5V 0V Gnd are all separate lines
On 24 March 2018 at 22:28, a k <pccncmach...@gmail.com> wrote: > Hello > It is sound strange but that what I have. > I build box 3 3 3 feet > And put all motor drive inside of it. > Why ? > This box build out of aluminum plate and holds together with bolts. > When all drive inside I have problem ==axis move by them self. > When I pull out all motor droves, they all working good. > I build this box to protect against outside magnetic noise = was logical > Right ? > But it is not what real situation . > > Something not ok, > Was I wrong with building aluminum box? > > > > > > > > > > > > > > On Mar 23, 2018 5:12 PM, "Gene Heskett" <ghesk...@shentel.net> wrote: > > > On Friday 23 March 2018 19:24:58 a k wrote: > > > > > I am in portland . > > > 30 to 40 v ac I read between water pipe _ which is real ground and > > > ground on the outlet pin that has cylindrical shape. > > > Is this normal? > > > > > No! > > > > But inspect that pipe, every inch of it all the way to real dirt. There > > may be a plastic connector, inserted someplace which will break that > > good ground connection. If so, jumper it from one side to the other with > > a solidly bolted connection using at least 10 gage solid copper wire. > > > > Water, depending on its purity is at best a poor conductor, although it > > can kill you, and really pure water (distilled or deionized) is an > > excellent insulator. > > > > > On Mar 23, 2018 4:03 PM, "Chris Albertson" <albertson.ch...@gmail.com> > > > > > > wrote: > > > > Aram, > > > > > > > > Where to you live? In North America, UK, ....? > > > > > > > > Building wiring conventions are different in different places. but > > > > in general your system, taken as a whole needs to be connected to > > > > exactly ONE ground reference. No more no less. The best way to > > > > place a bolt some place and define that is "The Ground" > > > > And all static grounds are to be stacked on this single bolt. > > > > > > If you have 30+ volts AC on a ground pin on an outlet you have a > > > > problem that needs to be looked at by a good electrician. It > > > > should never be that high. Some cases are thinks like corosion and > > > > loose connections. One cause I that think of is that in some older > > > > buildings they were allowed to use metal conduit as the ground > > > > connection. Works OK at first but metal conduit rusts ofter time. > > > > > > Now day's we are required to pull a group cable > > with its own static ground in this cable. > > > > > > > > > > On Fri, Mar 23, 2018 at 2:04 PM, a k <pccncmach...@gmail.com> 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, and while I'm commenting on a plastic connector, its entirely > > possible that a teflon taped water pipe joint could be an insulator. > > > > > > > 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 > > > > > > > > -- > > > > > > > > Chris Albertson > > > > Redondo Beach, California > > > > ------------------------------------------------------------ > > > > ------------------ > > > > 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 > > > ------------------------------------------------------------ > ------------------ > 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
