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Thread: help me figure out how to wire this relay to my monitor

  1. #11
    Fusion Brain Creator
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    wtf?

    how is this taking so long

    86 to one side of the digital output
    85 to the other

    30 to +12v
    87a to lilliput power

    energize digital output to break power

    if it doesnt work, either your brain (ha, ha) or the relay is broken

  2. #12
    Newbie
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    Yep...

  3. #13
    FLAC
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    I'm just thinking that since he's stated a few times that the relay's switch isn't opening, that maybe there's more going on, some sort of parallel path.

    For instance, I know that my old lilliput had a 12V barrel connector on it, in addition to the other connector, which also had 12V... the barrel connection wasn't necessary. And then if he's interrupting the barrel plug's power with the relay and the lilli is getting power from both sources, it may seem that the relay isn't functioning properly, beacuse of a parallel path.

    Just a thought.

  4. #14
    Mo' Programming Mo' Problems
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    Sonicxtacy02's Avatar
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    Quote Originally Posted by greenman100 View Post
    wtf?

    how is this taking so long

    86 to one side of the digital output
    85 to the other

    30 to +12v
    87a to lilliput power

    energize digital output to break power

    if it doesnt work, either your brain (ha, ha) or the relay is broken
    i'll confirm today that its wired like that but i'm only positive it is. The only other relay i have connected to the FB is plugged the same way as the other just with 87 not 87a
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  5. #15
    Fusion Brain Creator
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    try swapping with a known good relay

  6. #16
    Constant Bitrate
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    Make sure the relays you are using are SPDT as 87a is not used on SPST relays per the12volt.com.

    SPDT Relay : (Single Pole Double Throw Relay) an electromagnetic switch, consist of a coil (terminals 85 & 86), 1 common terminal (30), 1 normally closed terminal (87a), and one normally open terminal (87).

    When the coil of the relay is at rest (not energized), the common terminal (30) and the normally closed terminal (87a) have continuity. When the coil is energized, the common terminal (30) and the normally open terminal (87) have continuity.

    The diagram below center shows the relay at rest, with the coil not energized. The diagram below right shows the relay with the coil energized. As you can see the coil is an electromagnet that causes the arm that is always connected to the common (30) to pivot when energized whereby contact is broken from the normally closed terminal (87a) and made with the normally open terminal (87).

    SPST Relay : (Single Pole Single Throw Relay) an electromagnetic switch, consist of a coil (terminals 85 & 86), 1 common terminal (30), and one normally open terminal (87). It does not have a normally closed terminal like the SPDT relay, but may be used in place of SPDT relays in all diagrams shown on this site where terminal 87a is not used.
    Thanks,

    Dan

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