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12 volt led driver on pir timer powered via trailing edge dimmer switch

Discussion in 'LEDs and Optoelectronics' started by Vmaxdave, Dec 16, 2019.

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  1. Vmaxdave

    Vmaxdave

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    Dec 16, 2019
    Hi I have a 230 volt timed pir motion sensor supplying a 230volt trailing edge dimmer switch supplying a dimmable 230 volt to 12 volt led driver with 3 led lights drawing about 4.5watts my problem is that the dimmer will not dim the lights.
    if i place the dimmer before the pir motion detector the output relay fails to latch on and and cycles on off, is this because of a lack of load although the unit specs suggest the setup should work.
    any suggestions are welcome tia
     
  2. Bluejets

    Bluejets

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    Oct 5, 2014
    Dimmer will have to be , as you rightly showed to begin with, after the pir relay.
    Thing is, there are many different pir devices.
    Some are 2 wire which I doubt will work.
    Whereas others are output relay driven which should be fine.
    Assuming here that the dimmer is suitable for LED's and also working as it should.
    Note that in some LED dimmers, they will not restart the LED from a low setting.

    When supplying info, best to include as much detail as you can so many do not have to guess one way or the other.
     
  3. Vmaxdave

    Vmaxdave

    5
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    Dec 16, 2019
    Thanks BlueJet..the dimmer is an intelligent varalight with switchable leading/trailing edge mode ,the pir unit has both live and neutral in and the output is on relay out 230v live and neutral.the led driver is a leading edge triac type 230v to 12v dimmable unit with just 3 led lamps the loads are all well within spec .
     
  4. Bluejets

    Bluejets

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    Oct 5, 2014
    So will the dimmer operate the light correctly without the pir unit...?
     
  5. Vmaxdave

    Vmaxdave

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    Dec 16, 2019
    No theres no difference however i have just found a circuit diagram with the dimmer switching the neutral and i am switching the live so i guess theres an option to try out...
     
  6. Vmaxdave

    Vmaxdave

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    Dec 16, 2019
    I have also swapped out the dimmer switch to check against another one and no change there,Just wired the dimmer switching the neutral but no difference just switches on or off, i have ordered some resistors to add a bit more load to the circuit later on .
     
  7. Martaine2005

    Martaine2005

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    May 12, 2015
    Hi, did the LEDs come with the dimmable driver?.

    Martin
     
  8. Vmaxdave

    Vmaxdave

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    0
    Dec 16, 2019
  9. Martaine2005

    Martaine2005

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    May 12, 2015
    Yes, definitely seems like a load issue.

    Martin
     
    Vmaxdave likes this.
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