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  1. #1
    Join Date
    Dec 2007
    Location
    USA, California
    Posts
    25

    signal resistor (what is this, how's it work)

    Hi guys---

    Anybody know what a signal resistor is and how it works?

    I think it's geared towards something large like a chiller.

    Any help would be much appreciated.

  2. #2
    Join Date
    Dec 2007
    Location
    Calgary
    Posts
    14
    We have used them on Automated Logic controls, to tell the AR or VAV controllers its is the end of the line, and to loop the communication back up the line. Not sure if thats the Answer but it could be.

  3. #3
    Join Date
    Sep 2006
    Posts
    8

    Confused

    I'm not sure if you are referring to a terminating resistor; if so, it is typically used at the end of a bacnet network to eliminate any noise that is present on the network.

    I've not heard the term signal resistor.

    Hope this helps.

  4. #4
    Join Date
    Dec 2007
    Location
    USA, California
    Posts
    25

    Thank you for time!

    Many thanks guys--

    I just completed a 6 month course in HVAV/R and learned tons of stuff.

    The job I want is working for a large chiller and boiler service company.

    Unfortunately we spent very little time covering these topics in class.

    I told my teachers at school that I was leaning towards working on the "big stuff" and they said usually you get your training through the company that hires you.

    I've been through 3 interview's with a company that works on the larger equipment and they gave me a test with 120 questions---I got 25 right

    Then my mentor sent me out with my test and asked me to find the answers to the questions I missed by any creative means possible. It's been some work finding the right answers and understanding the concept behind them but that is half of the fun right?

  5. #5
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
    Posts
    13,833

    test

    Quote Originally Posted by quest View Post
    Hi guys---

    Anybody know what a signal resistor is and how it works?

    I think it's geared towards something large like a chiller.

    Any help would be much appreciated.

    keep learning grasshopper
    sounds like a hard test

    frank
    I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
    YOU SHUT THE HELL UP AND QUIT RUNNING YOUR MOUTH!

  6. #6
    Join Date
    Dec 2007
    Location
    USA, California
    Posts
    25
    Thanks Frank--

    It is a hard test kinda like trying to cram 15 to 30 years of many "experts" hard earned knowledge into a sleepless week.

    If this thing works out I'll be starting at the bottom and working my way up so you can bet you'll be seeing me around more trying to get a better understanding of this trade.

  7. #7
    Join Date
    May 2007
    Posts
    50
    Signal Resistor?

    Has no bearing on boilers chillers or controls

    probably micro electronics

  8. #8
    Join Date
    Aug 2006
    Location
    New England
    Posts
    520
    I'm wondering if it's not just a 500 Ohm resistor used across a 4-20mA signal to convert to 2-10VDC.

  9. #9
    Join Date
    Mar 2005
    Location
    Pacific Time Zone
    Posts
    4,228
    Or is it an electronic transducer?

    Say take a 0-10VDC signal to a resistive output.

    Like here http://www.kele.com/olcat/OT8/res-1e.pdf
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  10. #10
    Join Date
    Sep 2006
    Posts
    8

    Confused

    Quote Originally Posted by quest View Post
    Many thanks guys--

    I just completed a 6 month course in HVAV/R and learned tons of stuff.

    The job I want is working for a large chiller and boiler service company.

    Unfortunately we spent very little time covering these topics in class.

    I told my teachers at school that I was leaning towards working on the "big stuff" and they said usually you get your training through the company that hires you.

    I've been through 3 interview's with a company that works on the larger equipment and they gave me a test with 120 questions---I got 25 right

    Then my mentor sent me out with my test and asked me to find the answers to the questions I missed by any creative means possible. It's been some work finding the right answers and understanding the concept behind them but that is half of the fun right?
    I am interested in seeing the questions on your test. Would you mind sending me a copy if possible. I would like to see how much I can answer.

    I've been doing controls for about 6 years and mot of it was OJT, but I have an electronics background, so most of the control logic came easy. I still get a little flustered on the mechanical side of things though.

    Thanks,

  11. #11
    Join Date
    Dec 2007
    Location
    USA, California
    Posts
    25
    Kashka----

    Wish I could help as it is one awesome test!!!!! Like one large puzzle!!!!

    I did not make the test---Somebody with many years of training and hard earned experience did. (Hope to know as much someday)

    I gave my word that I would not distribute the test and would return it upon completion.

    Sorry it is not mine to give---only on loan for a spell from some cool people.

    Hope you can understand

  12. #12
    Join Date
    Feb 2005
    Posts
    1,261
    Quote Originally Posted by quest View Post
    Hope you can understand
    Unless you can give us the exact question and the context it was used in, all you will get from most of us are our best guesses.

    I have to be honest, I really don't understand what is all the secrecy is about,
    The details and accuracy in answers you get reflects the details you provide about your question.


    Good luck.

  13. #13
    Join Date
    Dec 2007
    Location
    USA, California
    Posts
    25
    I'm looking for the details myself

    when I find them I will post

    And yes you are absolutely right---Unless you have details it's kinda like a stab in the dark.

    It was never my intention to confuse anybody.

    Being a noob I was "assuming" that there was a simple answer and explanation to my original question at the start of the thread.

    Now I see that my assumption was incorrect and I stand corrected.

    Thank you pointing this out

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