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Schematic-PID Control Kiln

Discussion in 'General Electronics Discussion' started by Timap, Mar 14, 2017.

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  1. Timap

    Timap

    2
    0
    Mar 14, 2017
    Hello, could someone tell me why the Volt, Amp, Watt, KW meter ( bayite AC 80-260V 20A BAYITE-PZEM-021) not show correct readings, (top right area).

    ---Forgot to say that meter has been tested on a heat gun and 150w lamp, and the meter shows correct readings---.

    It worked at one time showing correct readings, 1300w, 11amps ect.
    Now it reads 400w, 3amps ect.

    the only thing I changed is coil ohms, it was around 19 ohms, in parallel around 9 ohms each coil. 1500w

    I shortened coils to 16.4 ohms, in parallel around 8.2 ohms each coil. 1800w

    It seems to be heating about .5 hrs sooner with the wattage increase.

    It is PID controlled ( MYPIN Digital TD4-SNR PID ) I think the PID is working fine, takes about 1-1.25 hrs to heat
    1 quart aluminum, ramps up steady and even, then smooth out at around 1200f and then about .5 hrs to reach 1400f.

    Let me know what you think, good, bad or ugly.

    Im sure not an electronic tech, but do the best I can with this old brain.

    Thanks All,
    T

    THE METER ISSUE ASIDE:
    If I changed over to a 50 amp SSR, could I easily convert to 220v, 25 amp.?
     

    Attached Files:

    Last edited: Mar 14, 2017
  2. shrtrnd

    shrtrnd

    3,821
    519
    Jan 15, 2010
    My initial thought is your PID Controller.
    You ran it up to your desired set-point once.
    PID's 'learn' and compensate for the circuit.
    I'd check the mfgr website and see if they have any tutorials on 'tuning'.
    Omega website has some pretty good tutorials if that helps.
     
  3. Timap

    Timap

    2
    0
    Mar 14, 2017
    Thanks
     
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