Re: [CAD_CAM_EDM_DRO] Re: Ground loop boogieman ... can someone explainthis

Hello Ken,
Ground loop: is if you have your ground connected on 2 or more points
then it becomes like a kind of coil. Now if you have a source that makes
high electric noise (Inverter/step or servodriver/something
sparking/radio frequency) then this noise might induct in your "ground
COIL" a current and tension. This may fool heavily all kind of
electronic equipment. The result may become VERY STRANGE. Examples: on
radio amplifiers that BUUUUZZZZZZ, or do not switch of transmission
mode. On Step or servo motors: jumping back and forth, unwanted
movements, lost steps.....
That is my attempt as mechanical guy to explain all the strange things
that I could observe in a radio amplifier factory for several years.
So connect your shielding wires only on the power supply side on one
single point (Star connection). Nowhere else.
Good luck
Sven Peter

Ken Jenkins wrote:

>
> Ground loop boogieman ... can someone explain this in some
> detail or point me to a link that does?
>
> I think I know basically - a "ground loop" is where you have two
> different return paths for your current but they ain't both
> at the exactly the same potential therefore .... problems,
> current flowing in a direction it should not be ... but
> I'd like to understand this (.... better ... or maybe
> "at all" if the above sounds offbase).
>
> I have created my own breakout board by gutting an old harddrive
> and putting screw terminals on top. I need 5+ vdc to power my
> PacSci 6410 drives and I don't want to bother bringing out another
> line from the PC (it's aesthetically unpleasing :-). So I just
> use the 5+ supply inside the old harddrive making sure to tie it's
> common to the ground pins (18-25) coming from the LPT port ....
> right? ok? no problem? ... or is the ol' ground loop boogieman
> just waiting to bite me with this set up? It's seems electrically
> sound based on what I know (or think I know) but I'm scared of
> the boogieman. What if I plug my harddrive/breakout box and my
> computer into separate outlets? What if my wife uses her hairdryer
> while I'm machining!!!!???
>
> Thanks .... please hurry ... I think he's under my workbench!!!!
>
> > you can get the ground too (but try not to create any ground loops).
> >
> >
> > Doug Fortune
> > http://www.cncKITS.com
> >
>
> Ken Jenkins
> kjenkins@...
>
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