RE: Using 240VAC on 140VAC Varic

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

Original poster: "Ian McLean" <ianmm-at-optusnet-dot-com.au> 

Hi Richard,

You are probably right ;)  I am sure they all came from the same place
(3-phase variac stacks in industrial control units).  I am going on what the
guys from Oatley said.  Mine has no faceplate.  I haven't actually done the
tests myself, just took what they said as read - but after seeing your post
here, I know longer trust what they are saying and will do the tests myself.
If it is indeed 480V rated and not 140V rated, then that is really great !
It DOES seem a little large for a 140VAC variac.  I would like to use the
step-up winding if possible.  What a buy at $40 !!!  So far, this variac has
worked great right up to full voltage for controlling a pair of 15/60 NST's.

Rgs
Ian

 > -----Original Message-----
 > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 > Sent: Saturday, 14 February 2004 2:11 am
 > To: tesla-at-pupman-dot-com
 > Subject: Re: Using 240VAC on 140VAC Varic
 >
 >
 > Original poster: "Richard Modistach" <hambone-at-dodo-dot-com.au>
 >
 > thats strange, i bought one of them,
 > 480v input, 0-560v out 9.8Amp rating
 > on the spec plate.
 > same current draw specs as yours on 240v
 > but at 320ma i left it on for a while and there
 > was no percievable temperature rise in the core
 > and i was able to get 272v at the ouput.
 > at 0-140v your's must be different to mine.
 > i thought the batch he got were all the same.
 >
 > regards
 > richard
 > aus.
 >
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Tuesday, February 10, 2004 11:48 AM
 > Subject: RE: Using 240VAC on 140VAC Varic
 >
 >
 >  > Original poster: "Ian McLean" <ianmm-at-optusnet-dot-com.au>
 >  >
 >  > Hi Dan,
 >  >
 >  > Yes.  I bought a variac from Oatley Electronics here in
 > Australia that
 > came
 >  > from the U.S.  It was rated for 0-140AC.  It was part of a
 > 3 phase stack.
 >  > It workes fine up to 2kVA on 240VAC, as long as you do not
 > try and use the
 >  > step-up winding.  If you wire it without the step-up, the
 > variac draws
 > about
 >  > 30mA without load, which is fine - but if you try and use
 > the step-up
 >  > winding, the variac draws about 320mA, so I suspect the core is
 > saturating.
 >  >
 >  > PS: The variac only cost me Aus$40 ;)
 >  >
 >  > Rgs
 >  > Ian.
 >  >
 >  >  > -----Original Message-----
 >  >  > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 >  >  > Sent: Tuesday, 10 February 2004 2:03 am
 >  >  > To: tesla-at-pupman-dot-com
 >  >  > Subject: Using 240VAC on 140VAC Varic
 >  >  >
 >  >  >
 >  >  > Original poster: "Mccauley, Daniel H"
 > <daniel.h.mccauley-at-lmco-dot-com>
 >  >  >
 >  >  > Has anyone tried running 240VAC on a variac rated for 0-140VAC ?
 >  >  > I know there are issues, but just curious if anyone
 > actually tried it.
 >  >  >
 >  >  > Thanks
 >  >  > Dan
 >  >  >
 >  >  >
 >  >
 >  >
 >  >
 >
 >