Re: 280 Variac + 4 Pack MOT wiring

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

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

Can you draw this for me?

--=Eric
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, March 03, 2004 12:20 PM
Subject: Re: 280 Variac + 4 Pack MOT wiring


 > Original poster: Finn Hammer <f-h-at-c.dk>
 >
 > Young Hydrogen18,
 >
 > Getting the grounding correct is not easy, so although it would probably
be
 > too harsh to say that you "Missed the point completely", still your
circuit
 > would not work as intended in the state that you have posted it.
 >
 > The center connection of the 2 sets of MOT`s primary`s are connected to
the
 > wiper of the variac, that`s ok.
 > The other side of the MOT pairs are connected together and stuck into the
 > ground.
 > If you intend to actually connect it to a ground rod, bear in mind that
the
 > impedance of a ground connection is high, and might not allow the passage
 > of high currents without a voltage drop.
 > But even then, if you are omitting to draw, but imply a wire to the center
 > of the distribution transformer, it won`t work well:
 > With the variac at it`s CCW position, you will have 120volts across the
 > paralleled MOT pairs, with the wiper in the midle position, you wil get 0
 > volts and at the CW position there will again only appear the 1/2 voltage
 > across your mot`s primary windings.
 >
 > What you need to do is simple, though:
 >
 > Establish a virtual "neutral" reference at one end of the variac, either
 > will do equally well, it only depends on which direction you want to turn
 > the variac to "turn up the wick", and connect the formerly grounded wire
 > from the MOT`s to this point, and you will be up and flying.
 >
 > If you have the secondary`s phased relative to the primary`s, that is...
 >
 > Hope this helps,
 >
 > Cheers, Finn Hammer
 >
 > Tesla list wrote:
 >
 > >Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com>
 > >Do I have this schematic anywhere near right? The MOTS are supposed to be
 > >wired so that each set of 2 is out of phase from the others so that one
is
 > >producing -5000 while the others are producing +5000 for a difference of
 > >10000. The sliding shunt ballast is still under design.
 >
 ><http://www.hydrogen18-dot-com/stuff/IMG_5354.JPG>http://www.hydrogen18-dot-com/stu
ff/IMG_5354.JPG
 > >
 > >
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