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I think if I measure the open circuit voltage on the rotor circuit and I study the equations that have been sent in I will have my answer. Thanks for the input. Some to the responses talk about using the nameplate data. Probelm is there is no nameplate. I don't know how old this motor is...

Yes, step switches. I couldn't think of the term. That's why I put tap changer in quotes. The way the diagram is drawn, it looks like it might have been manual, but regardless I think you are right. It should be timed.

I've been talking to vendors, but I think maybe I haven't phrased the question right. I will try some more. I'll let you know if it works.

I like the idea of a cheap liquid rheostat for testing. I was thinking we would have to buy a resistor bank and test it.

We have a 250 HP wound rotor motor that came with a salvaged rod mill that is going to be put back in service at another nine site. The nameplate has been lost. We have a consultant's interconnection diagram from the installation that shows a 4-stage resistor bank in connected to what I would...