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Thread: Relay wiring

  1. #11
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    Although the pettiness of my problem can't be confidence inspiring, I really do know how a relay works. Now it's certainly possible I am not connecting to the right connectors, but I don't think so. If you want to look at a reference that is a little more relevant to this problem (given the relay marking I have) please look at this and let me know what you think.

    http://www.kpsec.freeuk.com/components/relay.htm

    The relays I have are triggered by 2 wires soldered to the bottom - hard to screw that up if I do say so myself. I started off triggering this with a FB but have also applied 12v (and ground) to them directly with no better results. These are not shown in my diagrams.

    For the rest of it, the page above matches it pretty well. I have 3 connectors, COM, NO, NC, which I expect to work as described.

    2k1Toaster, do you see any problem with the way I am testing or have these wired up?

    thanks,
    charles

  2. #12
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    Trigger pins are electrically insulated from NO, COM, NC. You also need to provide power source to the bulb

    EDIT: what type of relay is it? Any model number?

  3. #13
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    Quote Originally Posted by cgalpin View Post
    No probably bad choice of words on my part. By series I meant I introduced the relay into the starting circuit by "cutting" one of the lines.

    Testing with a single relay.

    My circuit is simply this

    12v -- bulb -- ground WORKS!

    12v -- COM -- [ relay ] -- NO -- bulb -- ground BULB NEVER COMES ON

    12v -- COM -- [ relay ] -- NC -- bulb -- ground BULB NEVER GOES OFF

    I have bypassed the FB and still have the same behaviour though when applying 12v to the trigger pins. Totally stumped....

    The only difference I noticed with the FB is I hear a hum when the relay is turned on. With direct 12v I hear a very soft click (but have to put my ear close to it to hear it)
    If you wire it 12v -- com -- no -- bulb -- ground and then power the relay
    coil from the 12v direct (no arduino at all) and the bulb doesn't come on...
    then quite simply the relay is goosed!

    Or it's some mad relay that needs huge voltage across it's coil.....

    C

  4. #14
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    Quote Originally Posted by digital79 View Post
    Trigger pins are electrically insulated from NO, COM, NC. You also need to provide power source to the bulb
    Yes which is why I showed you

    12v -- bulb -- ground

    This works fine. All I did was add the relay to the circuit. It still has ground.

    Quote Originally Posted by Cerberus View Post
    If you wire it 12v -- com -- no -- bulb -- ground and then power the relay
    coil from the 12v direct (no arduino at all) and the bulb doesn't come on...
    then quite simply the relay is goosed!

    Or it's some mad relay that needs huge voltage across it's coil.....

    C
    Yes this is why I am stumped. This should work! But 4 relays act the same way. I guess I'll try the last 2 to be sure

  5. #15
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    Quote Originally Posted by digital79 View Post
    what type of relay is it? Any model number?
    It's the ones the FB folks sell.

    Potter & Brumfield
    T9AS5D22-24

  6. #16
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    This one needs 24V DC for coil, you are supplying 12V.

  7. #17
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    wtf! must be that pesky -24 on the model number!

    Dayum. well, that would explain it. Sure will suck if I ordered the wrong ones

    Thanks man!

    charles

  8. #18
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    2k1Toasterer I sent ya'll an email as your site doesn't offer choices so the mistake must be on your end. This is what I bought

    http://www.fusioncontrolcentre.com/F...products_id=31

    thanks,
    charles

  9. #19
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    The relay on a pic has a 12V coil, you got different ones, 24V model.

  10. #20
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    Yeah I'm kicking myself for not realizing that because I did google it as soon as the first try failed and I should have noticed

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