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faulty photocell

Discussion in 'Electrical Forum' started by goldie, Nov 27, 2013.

Discuss faulty photocell in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. goldie
    Offline

    goldie Regular EF Member

    Location:
    W,Yorkshire
    Hi all. Any one had and probs controlling leds from ss4 dusk/dawn photocells?
    I replaced 3 150w metal halides with 3 70w led floods. Worked perfectly fine and the customer asked me to fit some extra led strips for his sign lighting 4weeks later (L.v complete with trannys) . The lights stayed on constantly since fitting the strips. Replaced the ss4. All ok.
    1 day later stayed on constantly again because new ss4 has packed up again.
    Anything to do with Led driver for strips?
     
  2. goldie
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    goldie Regular EF Member

    Location:
    W,Yorkshire
    Any ideas?
     
  3. Sintra
    Offline

    Sintra The Innkeeper Staff Member

    Location:
    Belfast/London
    Could be to do with the high in rush current when the lamps are starting. In some LEDs it can be 400 times greater than the running current. This could weld the contacts of the photocell closed. I take it though this was all checked out pre installation.
     
  4. bigspark17
    Offline

    bigspark17 Electrician's Arms

    Location:
    wales
    Maybe run photocell through contactor for lamps.. If your worried about loading on the photocell!
     
  5. ipf
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    ipf Trusted Advisor

    wrong thread, sorry
     
  6. goldie
    Offline

    goldie Regular EF Member

    Location:
    W,Yorkshire
    How could I have checked it?
    The ss4 is rated at 2 kw though. And it was switching 450w inductive load fine prior to this.
    They worked fine on 210w led untill I added two 30watt strip leds.
     
  7. goldie
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    goldie Regular EF Member

    Location:
    W,Yorkshire
    Led load is minimal compared to what it was running before
     
  8. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    maybe the pc don't like the trannys.
     
  9. Sintra
    Offline

    Sintra The Innkeeper Staff Member

    Location:
    Belfast/London
    The load might be minimal but the inrush could be massive. That extra 30W fitting could have added 12000W to the inrush.
     
  10. Marvo
    Offline

    Marvo Admin and gender confused Staff Member

    Location:
    South Africa
    Is the photocell a relay contact output or solid state switch? Maybe try wiring the photocell via a 2-pole DIN mounted contactor using 1 pole for the floods and the other pole for the strip lighting.
     
  11. MDJ
    Offline

    MDJ Guest

    You will find most lighting companies do manufacture photo cells for LED lighting, I have purchased them myself for projects, I know Cooper lighting do them as do others, due to this fact there must be a reason why this is the case, and maybe a Google may help.
     
  12. goldie
    Offline

    goldie Regular EF Member

    Location:
    W,Yorkshire
    The penny has dropped. Cheers.
    The last three comments sum it up.
    Ive added another tranny/driver, all of the lights have their own drivers and is not fed from from one driver source which would have been ideal but not practical.
    So changing to solid state lighting with all these inrushes for the independant lights have upset my sensor.
    I shall bob a contractor in...... I mean contactor. Thanks again
     
  13. goldie
    Offline

    goldie Regular EF Member

    Location:
    W,Yorkshire
    I will look into that. Cheers.
    Might be easier to use yhese instead of contactor.
     
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