Finding function contacts from Schematic

Discussion in 'General Electronics Chat' started by dxTime, Oct 26, 2015.

  1. dxTime

    Thread Starter New Member

    Apr 14, 2015
    6
    0
    Hello,

    Currently working on a project for modernization, however as I am a programmer and beginner in electronics, I am having great difficulty in identifying the operational contacts from the schematic of an industrial oven (for curing composites).

    I've included the schematic as PDF.

    If I were to create a program that gets readings of the temperature of the oven and than based on those readings I have to shut down the heating component of turn it on. What would I hook up my PLC leads to (Not using PLC just an example). Basically what controls what and what is its main switch (control). I am told that there are in total 8 operating contacts.

    Description of pages as its in Dutch:
    Page 2 Ventilation
    Page 3 Elements
    Page 4 Regulator
    Page 5 Writer
    Page 6 Door Switch
    Page 7 Start/Stop
    Page 8 Ven Chamber furnace
    Page 9/10 Burner

    Thank you
     
  2. sailorjoe

    Member

    Jun 4, 2013
    361
    63
    It's never easy to modify these types of control circuits, because they're designed to be highly integrated to save cost. I recommend starting by redrawing the schematic so you get a much better understanding of how it works. How is the temperature normally set? I see switches to heating elements on page 10. Is that a multipoint switch on the front panel, or something else. You have 230 VAC running around in this thing, so having a very good understanding of it before you start modifying it could be lifesaving.
     
    Last edited: Dec 20, 2015
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,532
    2,369
    sailorjoe likes this.
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