building a pid controller

Discussion in 'UDS Builds' started by 2010ultra, Sep 6, 2013.

  1. 2010ultra

    2010ultra Smoke Blower

    im building an automatic pid controller for my double drum smoker. I have a mypin ta4 controller. my question is do I have to use an ssr to power a 24 volt dc 10 cfm fan or can I just wire it to the controller
     
  2. c farmer

    c farmer Smoking Guru Staff Member Moderator OTBS Member SMF Premier Member

    [​IMG]    Please give me more info.

    I want a controller for my uds.
     
  3. 2010ultra

    2010ultra Smoke Blower

    ill let you know tomorrow farmer. im building it tomorrow. and testing tomorrow, its only cost about 40 bucks so far.
     
  4. c farmer

    c farmer Smoking Guru Staff Member Moderator OTBS Member SMF Premier Member

    Great. Thanks
     
  5. If it works like a AC drive unit I think you need to go thru the controller for it to work correctly
     
  6. 2010ultra

    2010ultra Smoke Blower

    so if I go through the output on the controller ill be fine on the fan?
     
  7. Over on TVWBB there are a BUNCH of guys who build a heatermeter using a Raspberry Pi, a circuit card, and some elec gizmos. A bit beyond my skill level but there's a huge following and a lot of peer support.
     
  8. dward51

    dward51 Master of the Pit OTBS Member

    Depends on what variation of the TA4 you have.  The most common model has a SSR DC triggering signal. This is made to signal a SSR to switch on and not drive the load. The SSR actually controls the load.  The SSR output from the TA4 is 20ma max which is not enough for a fan.

    What is the full model number on the PID?  Here is a configuration chart to help you figure out what type of output your model has.  Then you will know more about what options for your power draft controller you have to choose from.

     
  9. dcarch

    dcarch Smoking Fanatic

    A 24V fan sounds like a brushless DC fan. Make sure you connect the polarity correctly, some brushless fans can be burnt out if not.

    A 10 CFM fan is a very small fan, any relay can probably handle the current with no problem. Are you sure about 10 CFM is good enough air flow?

    dcarch
     
  10. 2010ultra

    2010ultra Smoke Blower

    well im gonna have to use an ssr and power an a/c fan. I fried the dc fan lmao. ssr is ordered so ill keep you guys up to date. controller is working perfectly. have temp set to 225 degrees, fan kicks in at 5 degrees below and shuts off 5 degrees above temp.
     
  11. 2010ultra

    2010ultra Smoke Blower

    well I cant find the right a/c fan I want to use so im gonna use the blower fan out of a hair dryer. its the perfect size to plumb into the 2 in bung in the firebox. once I get it built ill set the controller to autotune and let the controller do all the work. ill keep you up to date cfarmer. heres a pic of the pid with the thermocouple hooked up. I had to figure out the wiring myself on the thermocouple.



     
  12. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    Holy [email protected] another genius finds his way to SMF.......   Good thinking..... talk about outside the box......   We are all learning something valuable here......      [​IMG]......  ......[​IMG].....    

    Dave (HWLOTBT)   (he who love outside the box thinking)
     
  13. 2010ultra

    2010ultra Smoke Blower

    thanks dave from another dave lol!!
     
  14. dcarch

    dcarch Smoking Fanatic

    A hair dryer blower typically is wired in series with a resistance (heating) coil and a full wave bridge rectifier to convert AC to DC. It is a very noisy blower, and not a long lasting blower. At full power, it may be blowing too much air for your system.

    dcarch
     
  15. 2010ultra

    2010ultra Smoke Blower

    I thought about that but im not out anything its a 20 year old hair dryer. cheaper than buying one.
     
  16. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    ..........[​IMG]............  I wish I understood what was just, said so I could learn what was going on.... 
     
  17. 2010ultra

    2010ultra Smoke Blower

    hahahhaha dave
     
  18. 2010ultra

    2010ultra Smoke Blower

    well I have everything done and hooked up to the smoker. today is gonna be the test day. heres some pics hope you guys enjoy.

     
  19. 2010ultra

    2010ultra Smoke Blower


    assembled the box today that holds the pid and the ssr.

     

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