Re: Ganging 1256D's

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

Original poster: "Jason Johnson by way of Terry Fritz <twftesla-at-uswest-dot-net>" <hvjjohnson13-at-hotmail-dot-com>

Why don't you just leave them in parallel and hooked to the 240 mains, but
use a voltmeter to monitor the voltage output as you bring the variac around
and put a big mark on the dial -at- 140? Or you could use a large contactor to
change the input (variacs still in parallel), i.e. make it switch one of the
hots over to nuetral so you'd have 120 volts input and just use the full
scale of the variacs like normal (and it would still be capable of 56 amps).
Not exactly sure what you mean in that last paragraph, I would just connect
terminals 1 togther, terminals 2 together... And then hook them to your 240
like normal.

Jason Johnson

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, March 13, 2001 1:43 PM
Subject: Ganging 1256D's


> Original poster: "Richard Wayne Wall by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <rwall-at-ix-dot-netcom-dot-com>
>
> 3/11/01
>
> I have recently added a second Powerstat 1256D variac to my power cabinet.
> They are identical 0-280vac, 28 amp, 7.8 kw single phase.  I have ganged
> them together and wish to increase the power to 15.6 kw at 56 amps.  I
also
> wish the capability to just use one leg for occasional 0-140 vac output.
>
> My question is should I hook them up in parallel or in series with one hot
> leg going to each variac?  Seems if in series each will still be limited
to
> 28 amps.
>
> RWW
>
>
>