Home Forums PID Control / Tuning New User trying to control Heater

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  • newmexelec
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    Post count: 1

    I am not sure if this forum is still looked at, but I am a new user of the osPID kit. It has taken me a while to get to this project, but I am here now trying to use the hardware. So far I have Processing running with the correct libraries and I have communication with the osPID Hardware. I have been reading on the forums and I saw this thread that is relevant to my question:
    viewtopic.php?f=8&t=279

    Specifically, I am trying to use a 115V enclosure Heater bring a closed chamber from room temperature up to 48C and hold it there until a digital input says to turn off.
    This problem has three main parts:
    1.Heat to 48C
    2.Hold at 48C
    3.Turn off when digital Pin goes High

    When I create a ramp and load it from Processing, it seems to make it to the board as I see the new set point show up, but The solid state relay only clicks on a couple times which DOES turn on the heater… but then the heater fails to respond after a minute or so of intermittent clicking. Could it be that the osPID is doing some sort of PWM that is too quick for the heater to respond?.. (the heater has a fan that kicks on when given power- which is how I know when it is active) for example say it is turning off too quickly, what type of voltage should I see coming out of the 115v SolidStateRelay…. I should do this test.

    Perhaps I am missing something and making this more complicated that it should be… is there a straightforward way to approach a system where I have a 115V heater, a type K thermocouple, and the osPID…. I would like to set a temp for a target, and I need to hold it there… ( I can deal with triggering it off after I have the first part working.

    Sorry for the rambling post 🙄 … Hoping somebody has advice.
    Thanks!

    Cracked
    Participant
    Post count: 44

    There a still a few of us kicking around, although the spambots have run riot.

    You say you are trying to ramp to 48°C. Is this for a sous vide or similar?

    Not specifically addressing your question, but perhaps you want to step to 48°C instead?

    Next question, what temperature is the thermocouple reading when the SSR stops turning on? What tuning parameters are you using?

    The more detail you can provide about the system/problem, the easier to help. 🙂

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