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How to make 3-phase contactor to chatter?

  1. Mar 15, 2017 #1
    I have a ABB A16, 3 phase contactor. I need to generate burst signals from this contactor as similar in relays when it switching on and off frequently. I need the circuit diagram for making the contactor to chatter. A26_30_10_230V_50HZ.jpg
    The circuit I used to make chattering relay was as below: relay.png
     
  2. jcsd
  3. Mar 15, 2017 #2

    berkeman

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    Staff: Mentor

    This is the noise source for your ModBus comm interference experiments?

    Maybe you should consider just renting the equipment for doing the industry standard version of your noise test, EN 61000-4-4

    https://www.atecorp.com/compliance-...1000-4-4-testing-and-measurement-techniques-e
     
  4. Mar 15, 2017 #3
    yes, this is the one source which I can consider as interference source. This experiment is related to academic research, can't do it outside
     
  5. Mar 16, 2017 #4

    berkeman

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    The problem is that if you don't use a very developed and understood industry standard test procedure, others cannot rely on your results. You would never be able to sell a product based on performance in your home-brew noise rejection test. You need to demonstrate noise immunity against industry standard tests. There are lots of reasons for this, including the validity and integrity of the tests...
     
  6. Mar 17, 2017 #5
    Berkeman is 100% correct even tho your experiment is Academic in nature.. That said, there is no reason for that contactor to ever chatter if everything is wired correctly to begin with.. NEC requires the coil of the contactor be powered from the source power feeding the contactor.. This is done so the electrician that may work on this unit doesn't get his ears lite up from a random turn on signal.. Hence a Pilot Relay (or similar) is required, this is energized from your ModBus Comm system which is generally low voltage.. The major reason for any signal interference which will cause chattering in your contactor is a routing problem with your control wiring.. Low voltage control wiring is never put in the same conduiit or run parallel, in the open, with high voltage conductors.. Inductive bleed over is the issue at hand.. Berkeman is correct in saying the tests need to be preformed with 'real world' standards and procedures but it is also necessary to follow 'real world' wiring procedures as per NEC (National Electric Code/NFPA)..Sorry if I missed the whole reason for your experiment, just trying to share a little knowledge I've gained as a real world electrician...
     
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