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Re: [TCML] Current control

Hi Paul,
Sounds like excellent sizing of variacs for both voltage and current limiting. I do exactly the same with my pig controller, however, I'm using 30A variacs, so I'm limited and slotted the core in my ballast variac to prevent saturation. With your big 45A variacs, you have no reason to do that. The ballast variac is simply connected in series with one of the hots running to the PT. The wiper (3) is one connection and then the other connection is one end of the variac winding. Depending on which side you connect to the end of the winding determines the dial rotation for increased/decreased current. 

Take care,
Bart

Paul McGlen wrote:

Hi ,

Another question for the knowledgeable out there.
I am building a 10-inch coil driven with a distribution transformer. I plan to use two 45 Amp variacs, one to control the voltage and the other to control the current. Am I correct in thinking that to control the current I take a feed in from the output of the variac controlling the voltage and feef it into one end of the winding of the current variac and the wiper woul still be my output? If not can anyone give me a schematic showing the correct way. Also is there any benifit in putting a large inductor in line withe the variac that controls the current ( I do realise that this would be two inductors in series), but could I use the fixed one as a limiter? 

Paul M.



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