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42809Re: [new_distillers] PID Controller

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  • Bob Glicksman
    Nov 21, 2012
      Hi Jeri,
      As I said, no I do not have the technical manual.  I was just pointing out that proportional control of the heating element is not possible with an electromechnaical relay.  The heater is either on or off, and the relay cannot be cycled fast enough to make it pseudo-analog.  If a thermostate-like mode is supported by the PID controller, that is fine, as long as this type of operation is acceptable to Gavin.
      -----Original Message-----
      From: laxt57 <laxt57@...>
      To: new_distillers <new_distillers@yahoogroups.com>
      Sent: Wed, Nov 21, 2012 8:54 pm
      Subject: Re: [new_distillers] PID Controller

      Hi Bob
      Did you read the technical publication  for this controller?
      I did

      -----Original Message-----
      From: Bob Glicksman <bobg542492@...>
      To: new_distillers <new_distillers@yahoogroups.com>
      Sent: Sun, Nov 18, 2012 9:42 pm
      Subject: Re: [new_distillers] PID Controller

      I don't know this particular PID controller, but if it is going to use a PID algorithm (proportional-integral-differential control), then it needs to adjust the heater output, not just turn it on and off.  Some PIDs can rapidly switch an SSR in order to adjust the heat output.  They do this for turning on the relay for some number of AC half-cycles (about 16 ms each half cycle for 60 Hz AC), since the heater's response time is much slower and will average out the electric power being modulated in this way.  But this type of operation requires a fast electric power switching device (an SSR).  A contactor or other electromechanical relay is too slow to do this (and rapidly switching one on and off all of the time will wear it out in notime flat). 

      The only thing that you can realistically do with an electromechanical relay switching power to an electric heater is implement a "deadzone" type of control -- like an ordinary thermostat.  I'm not sure that this PID controller can do this.  Most PID controllers are far more expensive than a simple thermostat and there would be no reason to support this mode of operation.

      -----Original Message-----
      From: laxt57 <laxt57@...>
      To: new_distillers <new_distillers@yahoogroups.com>
      Sent: Sun, Nov 18, 2012 1:03 pm
      Subject: Re: [new_distillers] PID Controller

      Sure, simple as piece of cake.
      The number 9 and 10 terminals provide power to the PID
      (only for the PID not the heating element)
      The 6 and 7 terminals control a relay for some sort of device
      The 4 and 5 terminals are input from a thermocouple

      So, I assume you are using this to control a heating element?
      To make it work, you will need contactor(relay) big enough to run
      your heating element.
      Also you will need a thermocouple  and a heating element of course
      The thermocouple is polarity sensitive, so you need to connect it
      the right way round, that is if you are asking form hot and you get cold
      swap 4 and 5

      |               |   4---------------- Thermocouple +
      |     PID     |   5---------------  Thermocouple -
      |               |   6---------------  Contactor------------------- coil RELAY--------- heater
      |               |   7---------------- Contactor------------------- coil RELAY--------- heater
      ----------------                                                        AC   AC
        9      10                                                            IN    IN
       AC    AC
        IN    IN

      Hope this helps

      -----Original Message-----
      From: grainbrewer <gavin_flett@...>
      To: new_distillers <new_distillers@yahoogroups.com>
      Sent: Sat, Nov 17, 2012 11:42 am
      Subject: [new_distillers] PID Controller

      I recently purchased a PID Controller. Not being at all familiar with electronics, I am having a very difficult time understanding the instructions. Is it possible for someone to read the instructions and translate them into lamens terms for me? Mostly I am unfamiliar with the wiring diagram and symbols.

      The PID is an Auberins SYL-2372 and I have a contacter to go with it model # CN-PBC302-120V.

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