RE: [CAD_CAM_EDM_DRO] Re: Thoughts on PC Based Control Retrofit....now transformers.

Folks:

You don't have to import anything into the States. Most of the Electrical
Supply Houses (GE Supply, Graybar - to name a few) stock these types of
transformers. They typically have four windings on them. Each winding has
the same rating. You connect two for the primary and two for the secondary.
Connect each pair in parallel and you have an isolation transformer for the
lower rated voltage of the transformer. Connect them in series and you have
an isolation transformer for the higher rated voltage. Connect one pair in
series and the other pair in parallel and you have a step-up or step-down
transformer.

-- Carol & Jerry Jankura
Strongsville, Ohio
So many toys, so little time



-----Original Message-----
From: Ian Wright [mailto:Ian@...]
Sent: Friday, May 04, 2001 7:04 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: Thoughts on PC Based Control
Retrofit....now transformers.


KVa stands for KiloVolt/Amps so a 2KVa transformer is capable of delivering
the equivalent of 2000 volts at 1 amp or 1 volt at 2000 amps. So if it gives
110 volts output, this will be, theoretically, at 18.18 amps. You do,
however, have to allow for losses of maybe 20% and so a workable figure
would be around 14 amps. The 6 KVa type would give around 43 amps.

Ian
--
Ian W. Wright
Sheffield UK
www.iw63.freeserve.co.uk

----- Original Message -----
From: "Marty Escarcega" <escarcega@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: 04 May 2001 23:01
Subject: Re: [CAD_CAM_EDM_DRO] Re: Thoughts on PC Based Control
Retrofit....now transformers.


> What kind of current capacity John? You want to start exporting
> them? :-)
> Marty
>
> On 4 May 2001, at 19:16, John Stevenson wrote:
>
> > Don't know if this info is relevant to the US but here in the UK we
> > have 240 to 110v transformers for using power tools on site. These
> > come in various outputs as regards aperage. Usually 2Kva to 6KVA what
> > ever that means. These are very heavy and encapsulated in usually a
> > yellow plastic case, made to be dropped from scaffolding on a building
> > site - no I'm not joking. Inside they have a centre tapped secondary
> > so you get 50v - 0 - 50v. 50 x 1.4 for a full wave DC supply will give
> > you 70v DC. Good thing about these is they are plentyfull. Any car
> > boot sale will reveal at least 4 and the going price is usually 20 to
> > 25 UKP each, sometimes less. Do you have something like this in the
> > US??
> >
> > John Stevenson
>
>
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