Paul,It sounds like your current control variac is saturating or is connected improperly. Did you insert a rigid spacer inside the slot to prevent the air gap from closing up under load? Even with a spacer installed, current control will be very nonlinear versus the knob setting since the non-saturating inductance will be proportional to turns squared. The "cut" variac should be connected in series with the input to your main variac as in the simplified ASCII art schematic below (use a non-proportional font to display properly):
<----------OOOOOOOO Cut Variac used as variable ballast
^
|
| Main Variac
Mains -----------OOOOOOOOO----
^ |
| | LV side of pig
---------------OOOOOOOO--
| |
<--------------------------------------o---------------
Bert
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Paul McGlen wrote:
Hi all, I recently received some info on using a second variac to control the current to a pole pig, however, I seem to be having further problems. I cut the core of the second variac in two as sugested, but when I connect it up and try to run it, the current goes straight up beyond 50 Amps and the breaker kicks in. Could someone verify the way in which it should be wired up. Please help. Regards Paul McGlen._______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
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