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PID Programming Problem

Discussion in 'Electronics, Hardware & Software' started by boybrewer, 28/5/17.

 

  1. boybrewer

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    Posted 28/5/17
    I am technologically dyslexic when it comes to computers and PIDs . It all started when I decided to clean the mash tun after a few years of just running hot water through it after brewing . I set the SV to 100*C and ran oxyper through it after an hour I turned the PID off for maybe 10 or so seconds turned it back on and the screen read 000000 flashing so I turned it off and put it away , thinking I broke my toy . Today I turned it on and it worked well sort off it kept running over set temp and the alarm 1 light is always on . Yes it does come on when it reaches set temp but it just stays on . Sorry about the long intro but how do I turn off alarm 1 or disable it or fix the problem.............
     
  2. barls

    causer of chaos and mayhem

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    Posted 28/5/17
    congrat. im in the same boat.
    some how i stuffed up the programming or settings and it won't step through the program.
     
  3. Adr_0

    Gear Bod

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    Posted 28/5/17
    Do you have a manual for it or know the model? It's possible that it was reset.
     
  4. barls

    causer of chaos and mayhem

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    Posted 28/5/17
    mines a aubins syl 2352p. fairly sure its a setting some where. i ran the auto tune and it went beautiful. now it just tells me its holding on the step but won't step to the next one.
    I've only got three steps programmed. that could be my other problem.
     
  5. boybrewer

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    Posted 28/5/17
    Mine is an RKC CD101
     
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  6. GrumpyPaul

    Grumpy old Bastard.

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    Posted 28/5/17
    Maybe your control box needs to be earthed....nah that's not it.
     
  7. boybrewer

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    Posted 28/5/17
    At least I don't try to put 15amps through a 10 amp control unit
     
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  8. Glomp

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    Posted 28/5/17
    BARLS Its a bit hard to troubleshoot without knowing your steps. It may be a simple programming problem. I have an auber and it took a little while for me to understand it.
     
  9. barls

    causer of chaos and mayhem

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    Posted 28/5/17
    so i have a 50 degree for 15 minutes then to 60 for 60 then to 78 and hold.
    so
    step TEMP time
    1 50 15
    2 66 60
    3 78 0

    is this right
     
  10. Glomp

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    Posted 28/5/17
    Step 1 50 15
    66 60

    Says ramp from 50 to 66 taking 15 mins

    Step 2

    66 60
    78 0

    Says ramp from 66 to 78 taking 60 mins

    Step 3

    78 0
    Is meaningless


    You probably want something like this. I changed step times for clarity. You need to look at 2 lines at a time.

    48 15
    50 16
    50 17
    60 60
    60 18
    78 -121

    This means move from your starting temp 48 to 50 over 15 mins
    Then keep this temp at 50 for 16 mins
    Next ramp from 50 to 60 over 17 mins
    Then maintain 60 for 60 mins
    Next ramp from 60 to 78 over 18 mins
    Once 78 is reached stop
     
  11. evoo4u

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    Posted 28/5/17
    I think you need to add the intervening steps:

    1 50 15
    2 50 1
    3 66 60
    4 66 1
    5 78 0

    This is directing it to heat to 50, then over 15 minutes, raise the temp to the next line (which is also 50 - starting point, therefore, hold this temp for 15 minutes). In other words, a step temp command requires a starting line (Line 1) then a finishing line (Line 2), where the "1" tells it to proceed to the next step. The "60" is the time to remain at that step, and so on.

    "1" is the step change signal, and a "0" puts the program into HOLD mode.

    If you had:
    1 50 15
    2 66 60
    3 78 20

    that would be telling it to get to 50, then over 15 minutes raise the temp to 66, then once reaching 66, over the next 60 minutes, raise the temp to 78. Off the top of my head, I'm not sure what the controller would do with the 20, if there were no more lines programmed.

    The above is for the Auberins.

    EDIT - If you tell it to heat faster than your system is capable of, it'll just do what it can, and resume once it reaches the temp you've programmed.
     
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  12. barls

    causer of chaos and mayhem

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    Posted 28/5/17
    right i knew i was missing something.
    tried reading the manual but that just confused me.
    ill try reprogramming it when i get a chance
     
  13. Camo6

    Relax? Don't worry?? It's not just an internet for

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    Posted 28/5/17
    Just to clarify, 0 is not meaningless. It will pause and maintain the programmed step. Perfect for holding mash out temps until you finish mowing the lawn.
     
  14. Adr_0

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    Posted 28/5/17
  15. boybrewer

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    Posted 28/5/17
    Yes that is the one thanks .
     
  16. Adr_0

    Gear Bod

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    Posted 28/5/17
    By the way it looks like your alarm has a 2°C deadband, so needs to drop 2°C below the setpoint before it turns off.. Unless a button press will do it?

    The 0000 display seems to beaches if there's a wire disconnected.
     
  17. boybrewer

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    Posted 29/5/17
    No wires disconnected I opened the box after the PID was playing up and it was working 100% until I turned it off to change hoses when cleaning the brewery and then turned it back on and that is when I got the 0000 display . I will check the deadband and see if it is that and report back thanks.It won't be today as I am at work .
     
  18. barls

    causer of chaos and mayhem

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    Posted 31/5/17
    so if i wanted to get to 50, hold for 15 minutes, raise to and hold at 66 then to mash out it would be more like
    1 50 10
    2 50 15
    3 50 1
    4 66 10
    5 66 60
    6 66 1
    7 78 10
    8 78 0
     
  19. evoo4u

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    Posted 31/5/17
    1 50 15 - Heat up to 50C, and over the next 15'
    2 50 1 - stay at 50C. Now go to next step.
    3 66 0 - Heat up to 66C and then hold that temp indefinitely. (If that's what you want, as the "0" means "hold")
    4 75 0 - When commanded to "resume" (press and hold the down arrow for 2 seconds), heat to 75C and hold that temp indefinitely.

    (I "think" when manually commanding a resume from hold, the device will proceed to the next step, but I've never tried it. I only ever command a "hold" at the mashout step, so I can mashout at my convenience. As said earlier, so you can finish mowing the lawn...)

    If you know how long you want the 66C step (say 60 minutes), then:

    1 50 15 - Heat up to 50C, and once you've reached it, then over the next 15'
    2 50 1 - stay at 50C. Now go to next step.
    3 66 60 - Heat up to 66C and once you've reached it, then over the next 60'
    4 66 1 - stay at 66C. Now go to next step.
    4 75 0 - Heat to 75C and hold that temp indefinitely.

    Here's my "cheat sheet" which tells me all I need when the sozzled brain forgets :p :


    Auber PID Essentials.jpg

    Also, if for whatever reason, you wanted to slow the ramp rate (getting from 50C to 66C), so it took, say, 45 minutes, then the first steps would be:
    1 50 15
    2 50 45
    3 66 60
    4 66 1
    and so on... (But we normally want the ramp to be as fast as our systems will allow, but this just illustrates that you can dictate the time to get from one temp to another, and the unit will change the temp gradually, and in a linear fashion)
     
  20. barls

    causer of chaos and mayhem

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    Posted 31/5/17
    thats the info that will get me there easily.
    now just to change the program slightly and do another auto tune and ill go from there.
     

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