RE: [CAD_CAM_EDM_DRO] Re: Transformer wiring hookup 110/220

I use two of these transformers in my driver box, wired for 110 volts as
specified on the transformer. It is a single primary with a center tap to
allow for 110 volt operation. You only need to hook up the wires specified
for 110 volt operation to get full current out of the transformer. I
suspect that when you hook up the second wire you are either drawing too
much current or creating a short circuit which caused the breaker to trip.
Use one red wire and the black wire and you will be in good shape.

John Guenther
'Ye Olde Pen Maker'
Sterling, Virginia

> -----Original Message-----
> From: Bernard R <bwjarandall@...>
> [mailto:bwjarandall@...]
> Sent: Friday, January 17, 2003 10:41 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Transformer wiring hookup 110/220
>
>
> When wiring a 110/220 transformer, the primarys are paralleled for
> 110 and seriesed for 220. If there are two wires on the black
> terminal, seperate them and parallel the two resulting coils. I'm
> suprised that the reset tripped, I would have expected 0v on the
> output if the phase was wrong.
>
> If you look at any dual voltage equipment, the primary fuse is
> doubled for 110V operation, the corollary is that with only 1 half of
> the primary in circuit, you'll only get half the secondary amps.
>
> Bernard
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "fozzyber <jerry@o...>"
> <jerry@o...> wrote:
> > I received my transformers today!!!
> > I went to wire them up and had to stop to think about how to wire
> > them.
> > The transformers are (http://www.mpja.com/product.asp?
> product=7846+TR)
> > I hook the blues up for 24V, no problem
> > The primary is what is confussing me.
> > There are 2 red wires and one black.
> > the label on top shows as follows
> > RED 110V| |BLUE 12V
> > | |
> > Black | |Yellow
> > | |
> > RED 220V| |BLUE 12v
> >
> > I would assume if you were using a 220V you would just wire the
> reds,
> > and leave the center black disconnected.
> > but what about 110V? I Hooke one red and the black.
> > and bingo 24V across the blues.
> > I started to think about this and though but I don't have the other
> > half of the primary hooked up.
> > So I wired the other red to the first red.
> > The transformer hummed for a second, then tripped the reset on my
> > power strip.
> > How do I wire for both primarys to power up?
> >
> >
> > Jerry
>
>
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