[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: How are 240 VAC variacs made?



Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com> 

you completely missed the point....are they center tapped to ground or not?
Obviously 2x 120 vac's ganged together are or can be, but are the single
core 240 VAC ones center tapped?

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, February 29, 2004 12:37 PM
Subject: Re: How are 240 VAC variacs made?


 > Original poster: Finn Hammer <f-h-at-c.dk>
 >
 >
 >
 > Tesla list wrote:
 > >Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com>
 > >How are 240 VAC variacs made? Since the feed you get from your pole pig
is
 > >240 VAC center tap, are they really 2 120 VAC variacs with linked shafts
and
 > >aligned rotor contacts? I dont see how you get it to work if it wasnt
 > >because the rotor contact would be a potential to either side of the line
 > >but would really be pulling from only one half on the transformer and
 > >essentially feeding it with 120 VAC although it would be able to deliver
 > >0-240 VAC.
 > >---Eric
 > >
 >
 > Eric
 >
 > There are 2 popular ways to make these variac`s, one for the dumpster
 > diver, another for the pro.
 >
 > The pro just orders a 240/280volts variac, which has enough windings to
 > sustain the voltage.
 >
 > The scrounger hauls 2 120 volts variacs home and connects them like this:
 >
 >             +----------9 <----------------
 >             |          9            ^
 >             |          9            |
 >             |          9            |
 >             |          9            |
 >             |          9          0-280V
 >      -------)----------9            |
 >     ^       |          9            |
 >     |       |          9            |
 >     |       |                       v
 >     |       +----------9 <-----------------
 >    240V                9
 >     |                  9
 >     |                  9
 >     |                  9
 >     v                  9
 >     -------------------9
 >                        9
 >                        9
 >
 > The "9`s" are the windings.
 >
 > If morale is high, he connects them on the same shaft, but this is not
 > necessary.
 >
 >
 > Cheers, Finn Hammer
 >
 >
 >