Re: Variac frequency question

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>

Tesla list wrote:

> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <ryanchrj-at-notes.udayton.edu>
 
> Hello list,

>      I recently acquired a stack of three 0-140V  20 Amp  400Hz
> variacs (Technipower, type M20's).  I went to the manufacturer's
> website and found that they can each be run with 60 Hz 60V input
> at 20 Amps without problem.

> My question is can they be run at 120V 60Hz input with some
> form of inductive or resistive ballasting on the input, or will
> there be excessive core heating or saturation problems?

	I would expect that to work.

	If all are not needed, one might be used to ballast another,
	either variably, or fixed...

	best
	dwp