Voltage on I at the same time as SW

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  • Hi,

    so normally connection diagrams show that we connect L to L, N to N and L to I. Then when we have L on SW relay is closed and there is voltage from mentioned I(input) to O(output).

    I would like to have voltage on I at the same time when it appears on SW, so I has voltage only when SW(switch) is on and then and only then from mentioned I(input) to O(output). I know it wouldn't be possible to use for example command from Home assistant but are there any drawbacks of this solution?

  • A certain delay between the input pulse (at terminal SW) and the closing of the relay contact will be inevitable - due to the fact a CPU is the intermediate part between both terminals. In this thread you’ll find some oscilloscope graph showing delay times (unfortunately in German language):

    thgoebel
    7. Februar 2022 um 15:33

    „Habt Geduld. Alle Dinge sind schwierig, bevor sie einfach werden!“ (aus Frankreich)

    „Nothing in life is to be feared, it is only to be understood.“ (Marie Curie, 1867-1934)

    „Comment is free, but facts are sacred“ (C.P. Scott, britischer Verleger)

  • Thank you,.

    I have also done some tests and SW is preloaded with ~127V (I think because it is possible to use N to swich ON).

    Because of that, after switching OFF, connected bulb is still halfway ON.

  • Did you connect the input SW at an existing switch - bulb circuit? If this true, you’ll need

    (a) an intermediate relay, or

    (b) the optocoupler device which is delivered with Shelly RGB2, or

    (c) a simple resistor (500kΩ - 1MΩ) as described here:

    thgoebel
    2. September 2021 um 18:57

    In some cases it would help to swap live and neutral wires at Shelly (especially when the bulb is a LED type).

    If you have an issue to get those MELF type resistors, please feel free to contact me via PM…

    „Habt Geduld. Alle Dinge sind schwierig, bevor sie einfach werden!“ (aus Frankreich)

    „Nothing in life is to be feared, it is only to be understood.“ (Marie Curie, 1867-1934)

    „Comment is free, but facts are sacred“ (C.P. Scott, britischer Verleger)

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