Re: Transformer wiring (for CNC controller, of course)

Carlos,

That's the 220, 240 VAC tap. Consider it as a means of dropping your
output voltage 10%. Added flexibility.

Mariss

--- In CAD_CAM_EDM_DRO@y..., "Carlos Guillermo" <carlos@v...> wrote:
> OK -
>
> I figured it out. It all made sense once I realized that the 12V
> wallwart I used was actually outputting 14.3V from 118.7V at the
> outlet. It looks like each of the 2 120V primaries is tapped at
> 20V, thus the extra leads. (why?? Is this incase I have 220V
> mains?)
>
> Thanks for the help,
>
> Carlos Guillermo
> VERVE Engineering & Design
>
> -----Original Message-----
> From: mariss92705 [mailto:mariss92705@y...]
> Sent: Friday, February 22, 2002 4:11 PM
> To: CAD_CAM_EDM_DRO@y...
> Subject: [CAD_CAM_EDM_DRO] Re: Transformer wiring (for CNC
> controller, of course)
>
> Carlos,
>
> Here's what you can do with a small transformer and a digital
> multimeter to identify what you have:
>
> (1) Set the meter to Ohms and have a note pad and pencil handy.
> Use
> the ohmmeter to find continuity for all your wires. Write down
> which
> connect to which.
>
> (2) Take a very small transformer (6VAC "wall-wart") and apply its
> 6
> VAC to any winding pair.
>
> (3) Set your multimeter to Volts AC and start measuring the
> voltages
> on the other winding pairs. The highest reading one will be the
> primary. You already know the voltage ratios (120, 240, 86, 12,
> etc)
> so it should take very little time to puzzle out what is what.
>
> (4) After you have identified the primaries, hook them in series.
> Measure the voltage again. If you read "0" then you need to swap
> the
> wire making the series connection. If the voltage is twice what
> you
> had before, you got it right the first time.
>
> You probably have a pair of 120VAC primaries (series = 240,
> parallel
> = 120). The 46VAC CT is probably what you need for CNC work. Wire
> the
> primary in series (240) and run it on 120. The 86VAC will turn
> into
> 43VAC and give you 60VDC @ 20A. Nice supply.
>
> Mariss
>
>
> roups is subject to http://docs.yahoo.com/info/terms/