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Questions about my variac
Original poster: "Bill Vanyo by way of Terry Fritz <twftesla-at-uswest-dot-net>" <vanyo-at-echoes-dot-net>
I have a used variac with the following on the label:
General Electric VOLT-PAC
Mod. No.: 9T92A5052
Input: 250V 50/60HZ 3 PH
Output: 0-250V 50AMPS
It has several connection terminals, labelled as in the following
Right now I just hook my house line to 1 and 4 (4 being the hot wire),
and the line from my NST's to 1 and 3, so I can send 0 to 120 volts to
the NST's. It seems to work.
Does anyone know how else this can be configured? For instance, if I
had 240 volts in, and wanted to draw from 0 to 120 volts out?
Also, when I turn the dial to the extreme high end, there is some arcing
where the brushes make contact, and at that spot there seems to be a
carbonized area of the black stuff that encases the coils there. Is
there a way to fix this? Can that carbonized stuff be brushed out and
filled in with some appropriate insulating material?