Question from on of PJs diagrams before I begin build.

[J311gonzo]

So I have decided I want to do this build... its is one of PJs designs. Only quiestion I have now is if the PID does not recieve the temp from the BK how does it activate the element? does the element just run wide open then? thanks!!!!

30a 5500 2 element 2 pump single PID estop

https://www.homebrewtalk.com/f170/list-pj-electrical-diagrams-382286/

 

[MDHarris]

If you use the pid in manual mode it doesn't use the temp sensor to control the element. You won't be able to monitor the boil temp with the pid but you will be able to control the boil. Make sense?

Sent from my EVO using Home Brew mobile app

 

[J311gonzo]

You're saying I'd switch the pid to manual and set it to 212 deg f and let it go correct?

 

[iijakii]

You're saying I'd switch the pid to manual and set it to 212 deg f and let it go correct?

The automatic mode is where you set a temperature. It cycles the power on/off to keep it at that temperature. When you set it to manual mode it's basically a percentage on/off -- 1-100%. Temperature has no input as it's strictly cycling power based on an overall utilization.

 

[augiedoggy]

The automatic mode is where you set a temperature. It cycles the power on/off to keep it at that temperature. When you set it to manual mode it's basically a percentage on/off -- 1-100%. Temperature has no input as it's strictly cycling power based on an overall utilization.

Think of manual mode as a knob with marked level from 1-100.like on a stovetop (not an oven)... only you set the setpoint on the digital controller instead of turning a knob.

 

[J311gonzo]

So what I would do is set the pid to like 75% for the boil or whatever it ends up being and the pid with run the element at 75% of its total output? Correct?

 

[iijakii]

Basically, yes. Just to clarify it's not regulating voltage; it's running the element at full-power 75% of the time.

 

[neild5]

So I have decided I want to do this build... its is one of PJs designs. Only quiestion I have now is if the PID does not recieve the temp from the BK how does it activate the element? does the element just run wide open then? thanks!!!!

30a 5500 2 element 2 pump single PID estop

https://www.homebrewtalk.com/f170/list-pj-electrical-diagrams-382286/

To run in automatic mode you need to have an rtd probe in the BK connected to pins 3,4 and 5 on the PID.

 

[augiedoggy]

To run in automatic mode you need to have an rtd probe in the BK connected to pins 3,4 and 5 on the PID.

technically the sensor just has to be connected to the pid.... if the operator is in manual mode the sensor could be reading anything and it wont effect operation...

Its my understanding that an ssvr and potentiometer is yet another option that can vary the voltage and not timing to the element correct?

 

[Brumateur]

To run in automatic mode you need to have an rtd probe in the BK connected to pins 3,4 and 5 on the PID.

You can use a thermocouple as well. And if you don't need to know temperature you can connect a 100-200omh resistor instead of temperature probe.