PID w/ Potentiometer dial for Manual Mode

[augiedoggy]

My disable switches switch the low current/voltage SSR input circuit. I know they can fail closed, everything can fail, and there are three or four ways upstream of the elements to interrupt the current.

I have a relay that disables ALL the 220V circuits for unplugging elements, emergencies, etc.

I have a similar setup.. my relays are all 24v dc and I have a 3 way selector switch to determine which 4500w if any is actively being controlled and hot.

I never use the emergency mushroom shutoff myself and If I were to do it again I probably wouldnt bother with it

 

[-CHRIS-]

In my Kal clone panel, I have one 30 amp contactor that cuts all power to the panel that is controlled by keyswitch. Each element has its own contactor to turn power to the SSRs on and off. I have a simple three way switch that lets me turn one element or the other element on via contactor. When you are doing a 13.5 gallon boil in a keggle even using fermcap I find the need to shut down the element quickly regardless of what the SSR/PID is doing.

Chris