I've got an oven that uses 4 SCR's that control the heater elements. The problem is that the heat is on all the time. It has a 4 to 20ma tempature control that sends a signal to the SCR control board. The oven is 480 volt 3 phase and 4 SCR's control 2 of the phases while the other phase is conected directly to the heater element through a contactor. The 4 to 20ma control works as I ran it through my meter an looks fine. I wanted to use an oscilliscope to look at what was going on with the SCR's to isolate the problem to either the SCR's or the control board.
I think the SCR's are controlling the current to the heater elements. What should the signal at the gate of the SCR's look like? Or what would be the best way to isolate the problem.
Thanks for any comments
I think the SCR's are controlling the current to the heater elements. What should the signal at the gate of the SCR's look like? Or what would be the best way to isolate the problem.
Thanks for any comments