JLD612 Temperature Controller to control a large oven

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Joined: Sun Mar 30, 2014 7:30 pm

JLD612 Temperature Controller to control a large oven

Postby scarecrowtim » Sun Mar 30, 2014 7:47 pm


I just hooked up a JDL612 controller to control the temperature of a large oven that we use to dry back soil and heat up asphalt for testing. It worked for a few min but the electrical contactor was buzzing a little. I believe that it is set up correctly but now even though the "OUT" light is lit the heating element does not get hot and the electrical 2-pole 240 volt contactor does not connect to establish power through the switch and to the heating element. Do I have a bad contactor or a bad temperature controller. I see little reference to using the 2-pole 240 volt contactor and only reference to solid state relays but have seen a lot of stories about them getting hot and burning up. Will this temperature controller power a contactor or is it limited to SSR? I am kind of new to this but would like to make it work.


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Joined: Mon Mar 17, 2014 1:53 pm

Re: JLD612 Temperature Controller to control a large oven

Postby Lutz » Mon Mar 31, 2014 7:31 am

How did you hook up the contactor with the controller?
Hard to say without knowing how it's set up...

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Joined: Mon Jan 03, 2011 3:47 pm

Re: JLD612 Temperature Controller to control a large oven

Postby richiem » Sat Apr 05, 2014 9:21 pm

Relays and contactors will not work correctly when the 612 is set for use with an SSR for PID (duty-cycle) control for electrical heaters or for gas heaters. It will work if connected as a simple thermostat that just provides an on or off signal with lots of hysteresis, say 5 or 10 degrees.

Proportional control can only work with an SSR as the primary power switch to an electrical (resistive) heat source. Proportional control depends on rapid switching of the controling relay and the heater element. This means electromechanical relays and gas heaters are out for use with these JLD612 controllers.

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