Re: variac voltage out (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 14 Jun 2007 05:55:47 -0500
From: BunnyKiller <bunnikillr@xxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: variac voltage out (fwd)

Hey Chip,

you are right to a degree about the low voltage part...  you can in fact 
wire a 240 V variac on 120 V and it will function rather well  until you 
start wanting to use the full output range on the variac.
For example, at 0 out you get 0 output , as you increase the  "output" 
to about 85% you will get a matched true output of the input voltage. 
Once you pass the 85% mark, the output voltage doesnt climb much higher 
( especially if you have a load on the output side) .

Most likely the core is "too big" for 120Vac on a 1256D

How do I know ??  I tried it with a 1256D variac on 120 V in ...  :)

Scot D

 

Tesla list wrote:

>---------- Forwarded message ----------
>Date: Wed, 13 Jun 2007 15:38:57 -0600 (MDT)
>From: Chip Atkinson <chip@xxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: variac voltage out (fwd)
>
>Maybe for a few seconds before it overheats and gets destroyed.
>I believe that the impedance of a transformer's primary is carefully
>matched to the input voltage.  If your voltage is too high the current
>flowing through will be too high and overheat the transformer.  If it's
>too low, not enough current will flow to provide enough current to the
>secondary output.
>
>Correct me if I'm wrong. :-)
>
>Chip
>
>On Wed, 13 Jun 2007, Tesla list wrote:
>
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>
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>