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Temperature Controller — Parallax Forums

Temperature Controller

Twisted PairTwisted Pair Posts: 177
edited 2008-05-10 22:51 in Robotics
The Temperature Controller use's two Solid State Relays in unison to control two heater bands in·a Molded injection machine. Although this project was for a particular use, it could be adapted for a variety of applications. The attached PDF explains more in detail the·particulars of this project. Please read all pages of the PDF.

Twisted Pair....

Post Edited (Twisted Pair) : 4/28/2008 11:53:54 PM GMT
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KTablePos.bpx
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HBC Controller_SLED-C4.bpx
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Relay Controller.pdf
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Comments

  • sam_sam_samsam_sam_sam Posts: 2,286
    edited 2008-04-28 16:45
    Twisted Pair

    Very Nice Project



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    ··Thanks for any·idea.gif·that you may have and all of your time finding them

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    Sam
  • Twisted PairTwisted Pair Posts: 177
    edited 2008-04-28 23:50
    Thanks Sam....

    Twisted Pair....
  • Twisted PairTwisted Pair Posts: 177
    edited 2008-05-10 13:47
    Anyone have any thoughts or new ideas regarding my project ?

    Twisted Pair....
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2008-05-10 15:19
    OK, the PDF has a couple of pictures and a schematic.· The picture shows a DB9 (9-pin) connector on the rear panel, its connections were omitted from the schematic.

    So, the enclosure houses only the controller and you're routing Vdd and Q2, Q3 (open collector) outputs·via the DB9 and thereby to K1 and K2?
  • Twisted PairTwisted Pair Posts: 177
    edited 2008-05-10 20:12
    PJ,
    That is correct. The thermocouple is also routed through the DB9. The DB9 added a nice visual way to exit the enclosure although the wiring could have just been routed through a rubber grommet or strain relief at the back of the enclosure etc. The db9 was omitted from the schematics for clarity but I added a note in the parts list stating that the DB9 could be omitted if desired.

    The Temperature Controller has been working well for it's intended purpose and now has over one thousand hours running time on it. I'm well pleased with the results. Do you plan on making one for yourself ? Thanks for the reply PJ, your input is always welcome here.

    Twisted Pair....
  • UnsoundcodeUnsoundcode Posts: 1,532
    edited 2008-05-10 22:20
    Nice project TP, I would think you put a lot of time and thought into the finished product which looks very neat. How does·the control behave once you get to setpoint, is there anything about the injection process that would make the temperature swing low or high and if so·does the controller keep it within acceptable limits. It's a controller that you can obviously adapt for different applications and·your·Stamp has room for future enhancements which is a bonus.

    A lot better than the birds nest of wires I tend to end up with, good job

    Jeff T.
  • Twisted PairTwisted Pair Posts: 177
    edited 2008-05-10 22:51
    Unsoundcode,
    Once the setpoint is reached, the controller will maintain the temp usually within a few degrees above or below the setpoint. The injection barrel has a 1/2" wall thickness so it is very stable in regard to maintaining the heat without a quick cool down as with thinner barrels. There is a slight swing in temp whenever a new load of material is put into the barrel but it is a very small temp swing and is hardly noticeable. The two 500 watt heater bands do a nice job of keeping the barrel heated. In regard to to DB9, I preferred this method of connecter versus a bunch of wires hanging out of the enclosure.

    The project was well thought out and it did require alot of time even using CAD for design of the enclosure, Label and PCB. I intended to post this project a long time ago but just never had the time to do so until just recently.

    Thanks for your reply Unsoundcode....

    Twisted Pair....
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