RE: [CAD_CAM_EDM_DRO] 28v power transformer

Thanks Andy got it done just the way you said.

>From: Andy Wander <awander@...>
>Reply-To: CAD_CAM_EDM_DRO@yahoogroups.com
>To: "'CAD_CAM_EDM_DRO@yahoogroups.com'" <CAD_CAM_EDM_DRO@yahoogroups.com>
>Subject: RE: [CAD_CAM_EDM_DRO] 28v power transformer
>Date: Wed, 21 Apr 2004 13:06:18 -0400
>
>Many power transformers are designed for use on either 120VAC or 240VAC,
>and
>they are wired differently depending on which voltage you are using.
>
>The basic concept is that there are 2 identical primary windings, and if
>you
>connect them in series, you then apply 240VAC across the entire series
>length of the 2 coils.
>If you connect them in parallel, you apply 120VAC across "both coils" at
>the
>same time. The net result is the same output voltage whether "wired
>for/connected to" 120VAC or 240VAC.
>
>To do this correctly, you must connect the coils in the proper phase
>relationship or polarity, otherwise they will cancel each other out and you
>will get "zero" volts out of the secondary. This can be done by
>trial-and-error, as you are not likely to damage anything by hooking it up
>wrong.
>
>So, in your case, just wire the 2 coils in parallel, apply 120VAC across
>the
>parallel primary coils, and measure for the proper AC voltage at the
>secondary. If you get "zero" or close to it, you should change the polarity
>of ONE of the primary coils, and then try again.
>
>If you get readings that are very different from what they should be on the
>secondary, this transformer may have some other arrangement of dual primary
>coils, in which case more detective work will be required.
>
>Andy Wander
>Verrex Corporation
>
>
> -----Original Message-----
>From: stcnc2000 [mailto:thinkcnc@...]
>Sent: Wednesday, April 21, 2004 12:23 PM
>To: CAD_CAM_EDM_DRO@yahoogroups.com
>Subject: [CAD_CAM_EDM_DRO] 28v power transformer
>
>Hi,
>I'm building a power supply kit. I have a question on the primary
>side of the transformer, which has four wires. How do i wire this to
>110 vac?
>thanks
>Bob
>
>
>
>
>
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>OT subjects, that are not allowed on the CCED list.
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