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Thread: Lutron Skylark. SFSQ‑LF on 115v 50Hz

  1. #1
    Junior Member
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    Mar 2017
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    Lutron Skylark. SFSQ‑LF on 115v 50Hz

    Lutron Skylark. SFSQ‑LF
    Hunter Original ceiling fan.
    I have been using the Lutron Skylark fan control for years in a 115v 60Hz environment.
    I am now in a 115v 50Hz environment and trying to use the same 115v 60Hz control.
    It (the switch) does not seem to like this as the reduced speed positions produce too slow a speed. On LOW the fan is barely turning.
    To compound the problem, the fan is a 60Hz fan.
    I could use some advice on how to improve the situation.
    I have not been able to find out the method that the Skylark uses to control the speed. (capacitors?)
    I know the control switch is good because there two fans that do the same. Fans have been tested.
    Apart from the obvious problems running a 60Hz motor on 50HZ, the transformers I have seen are too large to use. (115v to 98v)
    The Hz converters are likewise too large.
    So I'll just have to live with the risk.
    Thanks
    Joe

  2. #2
    Authorized Lutron Contributor
    Join Date
    Dec 2015
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    144
    Hello JoeGons, The SFSQ-LF is only designed to work in 120V 60Hz applications. Using it in a 50Hz environment is out of spec and not UL approved.

    You are correct, it is capacitors that control the speed of the fan. Using it on a 50Hz signal will increase the resistance provided by the caps, and in turn slow down the fan. Though we wouldn't expect it to be too drastic of a change.

  3. #3
    Junior Member
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    Mar 2017
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    Thanks Jai H.
    The effect of higher resistance and 50HZ make the fan useless at the slow setting.
    Could I use a 240V 50HZ control switch with the 120V 50HZ supply?
    What would that do?

  4. #4
    Junior Member
    Join Date
    Mar 2017
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    What I need is a slider control for the fan and an ON/OFF switch for the light.

  5. #5
    Junior Member
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    Mar 2017
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    I need some help here!!

    If I put a 1.5uF or 2uF capacitor in parallel with the Lutron switch what will that do?
    I recon that should increase the speed.


    What am I missing here?


    Any ideas about the sort of value capacitors in the Lutron switch?


    I saw in one schematic (not Lutron) something that looked like a resistor in parallel with a capacitor.


    Trouble is that I have no idea what I am talking about.
    There seems to be so many different types of capacitors.


    Ceramic Disc Capacitor


    Metallized Poly-Film Capacitor 1.5uf 240V AC


    Radial Film Capacitor


    630V 1.5uF 5% Radial Lead Metallized Film Capacitors


    Electrolytic Capacitors 1.5uF 250V


    CBB61 AC450V 2uF Air Conditioner Electric Fan Run Start Capacitor


    CBB61 AC450V 1.5uF Air Conditioner Electric Fan Run Start Capacitor

  6. #6
    Authorized Lutron Contributor
    Join Date
    Dec 2015
    Posts
    144
    Hello JoeGons,

    Unfortunately we do not have a fan control for that application. We also cannot recommend adding any capacitors in parallel with our controls. This could present a safety hazard.

    In regards to the value of the caps in our controls, we are not able to share that information as it is proprietary information.

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