Looking for a controller substitute where output is to a DC amplifier and then into a Thyristor Driving Unit. Thyristor Driving Unit is driving the thyristor unit which is varying current to heater elements.

Bob Ilich
bilich [at] shipmantech.com

 

Hi there,

My suggestion would be to go for something simpler. The one I worked on before was similar to yours (also heater control) but there is no need to stick with it, there are much simpler systems available today.

I have found something that is a all in one unit and very versatile. It can also take a 4 to 20mA input, so it can be connected directly to a PID controller in the DCS or a stand alone PID hardware controller. The output is already the firing mode to the SCR's and is selectable.

http://www.mcgoff-bethune.com/manufact/eurotherm/scr/7100/7300a-data.pdf

If you need a PID hardware controller to go with it, here's a good one. If not use the DCS PID controller you use now.

http://www.ivaldi.fr/pages_anglaises/regul-emus.html