On Jun 3, 2011, at 6:44, "Jim Thomson" <jim.thom@telus.net> wrote:
>
> ## here's the procedure I use on both a 3CX-3000A7 [ 7.5v @ 50A]...
> and also a 3CX-6000A7 [7.0V @ 80A] . Separate 240 vac feed into the
> input of a 1kva Sola constant voltage xfmr. Output of Sola xfmr is fed into
> the
> input of a 0-240 vac @ 5A variac. Output of variac feeds the input of the
> dahl fil xfmr. Variac has a cam + microswitch on it's shaft. Microswitch
> contacts
> activate the coil of a dpdt relay.
>
> ## 1 x toggle switch for blower, and a 2nd toggle switch for the fil. Input
> of 2nd toggle gets
Along with the cam or flapper on the variac, I have a dpdt "wired around"
itself, on the main primary relay, with an RB (Red Button-- momentary) so when
you go for coffee and the power company does one of their 2 second x 3 power
cycles, the amp goes down and can't come up ' till I push the button.
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