On Saturday 09 October 2021 15:45:06 John Dammeyer wrote: > The caps go between pin 8 and 5 for each device. The 10uf just where > the 5V comes into the board.. > > This drawing may clarify it a bit. In North America the 220VAC is > split phase to provide 110VAC to a neutral. In the case of systems > that use 22VAC and 110VAC they often provide the black, white, red and > bare wire ground connection. On my mill I have only the black and red > and bare wire (green with yellow stripe) like the European > Blue/Brown/Green. > > Any 110VAC is created with a step down transformer. The Earth is the > bare wire (green with yellow stripe) that is ultimately connected to a > ground post or plate buried in the earth. As others have said, that > becomes the single point Frame Ground. Usually done with a bolted > post to bare metal and all other mechanical units have a wire from > their frame to this point rather than relying on bolted mount > connection for continuity. But only one place in the entire > machine/control system should be connected to the breaker panel earth. > > So in my case, not shown on the drawing, the Bergerda AC Servo drives > require 220VAC and have a metal heatsink with two screws. One for the > shield for the power cable to the motor and one for the green/yellow > wire in the power cable. > > Those run back to the AC Power Distribution as the 3rd prong where it > ultimately goes to the same bolt that goes to Earth in the breaker > panel. > > Make sense? > John
Yes and no John. There are times when the NEC bible we use here demands ground loops. The trick is to isolate them and obtain the right connection. Something I battled non-stop at WDTV, the carpenter who wired that building thought neutral and static grounds were interchangeable. He also used a copper rivit and a pair of pliars to crimp stuff. Fun and games to sort all that BS later, most it it done live as we were on the air with it. Inexcusable is a better term and I spent months tracing down and correcting his mistakes. I once replaced a smoking kearney bolt bringing 4 pieces of 750 mcm together, live because it was a direct connection to the substation pole. The transmitter building on a small mountaintop, had no entrance breakers when it was built in 1954, long before there was such a critter as the NEC. All grandfathered of course. I don't have a clue as to what the electrical bible is called on your piece of dirt, John. My copy of the NEC is dated 1996. so I'm sure they, like Farmers Insurance, have learned a thing or 2 since. I'd get a new one but they want way too big a pile of George Washington's for one. The one I have was $80 in 1996. I let tv tv station pay for it. They are way the hell and gone too proud of the copyright, the publisher once sued a larger city in Texas for several million because the city adopted the NEC verbatum as the city electrical code. Including it in the published copy of the city code was the copyright violation. > > > -----Original Message----- > > From: Peter Hodgson [mailto:peterjohnhodg...@gmail.com] > > Sent: October-09-21 12:22 PM > > To: emc-users@lists.sourceforge.net > > Subject: Re: [Emc-users] Fwd: Rogue Index Pulses > > > > Hi John, > > > > Thanks for sharing the drawing. Yes, I would like to get things > > properly drawn when I get the time. > > > > In the mean time....... would you mind having a quick look at the > > revised schematic on the following link to check I have placed the > > capacitors you suggested in the correct place when using the > > HCPL2631 ?? > > > > https://www.purbrookengineering.com/index.php?option=com_content&vie > >w=article&id=11 > > > > > > I notice on your drawing you have 'Earth' and FGND. What's the > > difference? > > > > Pete > > > > On 09/10/2021 18:18, John Dammeyer wrote: > > > Hi Peter, > > > I find it helps to draw a wiring diagram of where things are > > > wired. That�s different from a schematic which just shows how > > > things > > > > are connected. > > > > > For example, I've attached the old schematic of my mill wiring > > > (before I removed the two HP-UHU drives and wired in the > > > > quadrature encoder for the spindle into the second Chinese BoB). > > Note to self: Really must update now that I have AC servos on > > everything. > > > > > I have colour codes on there for wiring. But it does not show the > > > actual wiring paths. For example the 24V comes out of the > > > > Power Supply and splits in two directions. One to the DIN Rail for > > the MiniBoB->STMBL drive, the STMBL drive and 24V-16V UHU power > > supply. From there another DIN rail set of terminal blocks to run > > power out to the Bergerda Spindle Interface and now the Bergerda > > interface boards. > > > > > But the drawing doesn't actually show the DIN rails or wire > > > lengths so there's no way to see if the 24V system has ground > > > loops etc. > > > > Not from the Schematic. > > > > > So I still have to create a new 'mechanical' wiring diagram that > > > shows where rather than how things are connected. > > > > > > John > > > > > >> -----Original Message----- > > >> From: Peter Hodgson [mailto:peterjohnhodg...@gmail.com] > > >> Sent: October-09-21 1:38 AM > > >> To: Enhanced Machine Controller (EMC) > > >> Subject: Re: [Emc-users] Fwd: Rogue Index Pulses > > >> > > >> Thanks Chris, yes, I will change the shielding ground to the > > >> controller end and isolate the case. > > >> > > >> Is it best practice to run the 5v and 12v ?grounds? back to the > > >> original 24v power supply 0v? > > >> > > >>> On 9 Oct 2021, at 00:53, Chris Albertson > > >>> <albertson.ch...@gmail.com> wrote: > > >>> > > >>> ?I'll say what Gene said. I'd bet on a groubing issue. The > > >>> schmatic has an error, a groubd wire ismissing and also shows > > >>> random crossing grounds. Run everything back to the power supply > > >>> minus post. > > >>> > > >>> Also you be much better if the sheild was grounded to the > > >>> controller end. Never us a machine and it's mounting bolts as > > >>> grounds. > > >>> > > >>> > > >>> -- > > >>> > > >>> Chris Albertson > > >>> Redondo Beach, California > > >>> > > >>> _______________________________________________ > > >>> Emc-users mailing list > > >>> Emc-users@lists.sourceforge.net > > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > > >> > > >> _______________________________________________ > > >> Emc-users mailing list > > >> Emc-users@lists.sourceforge.net > > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > >> > > >> > > >> _______________________________________________ > > >> Emc-users mailing list > > >> Emc-users@lists.sourceforge.net > > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > > 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, 1940) 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
