Re: [CAD_CAM_EDM_DRO] Re: Transformer question - ground ?

In a message dated 10/24/2006 4:54:37 P.M. Eastern Daylight Time,
dave_mucha@... writes:

The grey wire is ported out thru a plastic header. the 2 blue wires
and 2 yellow wires are also ported out thru the same header. it
appears this is somehow connected into the windings and there is no
evidence that is is connected to the frame.

The blues and yellows are terminated in a 4 pin connector, and the
line grey wire has a sta-kon, ring connector.

Does this change anything ? or just make it more confusing ?




Dave:

It does confuse things a little since normally a ground wire is color coded
green with a yellow stripe or yellow with a green stripe or, in the U.S. here
just a green wire. I would say the suggestion about using an ohmmeter to
check for continuity to the frame is a good idea. However, you must keep in
mind that the resistance of the windings is also very low, sometimes not more
than two or three ohms depending upon the way it is wound. So, you are
looking for almost zero between what you think is the ground wire and the frame.
If you can't verify with this method, I would suggest you do not connect
anything to the machine chassis or frame. If you are attaching the transformer to
a metal part of the machine that is already grounded then you are covered
anyway.

Randy


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