RE: [CAD_CAM_EDM_DRO] Re: 80V Toroid & Ferrite Beads

Thanks Jon -

It's starting to become very obvious to me! BTW, how could you
determine the proper ends of a winding to hook up in parallel if
the terminals aren't lableled?

Regards,

Carlos Guillermo
VERVE Engineering & Design

-----Original Message-----
From: Jon Elson [mailto:elson@...]
Sent: Tuesday, December 09, 2003 9:56 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: 80V Toroid & Ferrite Beads


Carlos Guillermo wrote:

>Hi Jon -
>
>I was under the impression you could parallel the windings on a
>center-tapped transformer as well. What happens if you try? It
>seemed to me that whether you brought out two leads or one lead
>from the same middle point in a winding, you could just use that
>point as one terminal, then join the other two ends for the

second

>terminal of a paralleled setup. Is the direction of the each
>winding critical here?
>
>

Yes. What you suggest would short out the winding, causing it to
draw
huge current from the wall socket. it will either destroy the
transformer
or trip a breaker in your fusebox. The direction of each winding
is
absolutely important, as it determines the phase relationship of
the
AC wave. This is how you get 240 V across the two hot terminals
in the fusebox, but 120 V from neutral to either hot one. That is
exactly how the pole transformer is wired - a center-tapped
winding.
Don't try shorting the two hot wires in the fusebox together to
get
more 120 V current. It will explode.

Jon