Good day all. I'm trying to understand how a variable reactance transformer works. I have a vacuum furnace that uses the VRT for heating element control and there are 4 high current diodes up in the power supply and I'm trying to understand they keep blowing. These VRT's are controlled with a Variable transformer (rheostat)and what is happening is, the 125VAC output from the SCR to these variable transformer's becomes 260VAC and destroys the control board for the SCR Pack. Hopefully this is enough information. I would like to know about the VRT's because without knowing what to expect I don't know where to look. Thanks much for your time.
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