Re: [CAD_CAM_EDM_DRO] power supply

In a message dated 03-Feb-02 12:09:31 Central Standard Time,
cncforum@... writes:

> Does the ground leg of the DC output of the bridge rectifier in an
> unregulated power supply need to be connected to earth?
>
> I have seen one schematic where the power supply is earthed.

"Need to be"? Not so far as the rectifier or "rules" apply. However, MOST
electronic gear has the negative-return (should just say "return", as some
NEGATIVE supplies have "neg. out", so the +ve would be "return") as "earth"
("Ground" in USA).

However, if in YOUR application, the load (elecronics, motors, etc.) have
their "returns" connected to "chassis" or metal-housing "earth", then, yes!
Else, nothing will operate!

This has been a way to simplify wiring for decades, to "return" one side of
the DC-power through the metal housing, which is very often connected to
"earth", primarily for safety-reasons re the AC-mains, NOT because the
"electronics" needs to match its Kharma with Mother Earth. Did I
sufficiently confuse? I did not TRY to do so, promise! Jan Rowland


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