Pro 4PM 230v

    • Autor

    I'm in the US and looking to control a 230v pump using the Shelly Pro 4PM. The current wiring has ground, neutral, and two 115v hot wires, as I believe this is how 230v is wired in North America. I am unclear as to how I should wire the Pro 4PM given it only expects a single wire for either 115v or 230v.

    Thanks

    Welcome to the forum!

    You may arrange your Shelly pro 4PM as following:

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    Only 1/4 of the Shelly pro 4PM was shown in the sketch. L1 and L2 denominate the two 115V live wires.

    „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)

    „Es reicht nicht“, rief Schiller, „Gedankenfreiheit zu fordern, man muß auch denken können, sonst fordert man Gedankenlosigkeitsfreiheit und die ist die Freiheit zur Dummheit, welche wiederum die schlimmste Unfreiheit überhaupt ist!“
    (Aus „Besuch aus Weimar“ von Gert Heidenreich, Schriftsteller, *1944 in Eberswalde)

    • Autor

    Thank you for the quick response. To make sure I understand, I will wire the first hot to L1. I will wire the second hot to N and also continue on to the load. Finally I will wire the O1 to the load. The incoming neutral appears to be terminated prior to the relay in your drawing, so I assume you are saying to just cap if off (although I believe it is wired into the pump in the current configuration). I will not have any external switch at this time, so I left that out of the description. Does that sound correct so far?

    I understand I also need to include an RC Snubber give that the load is a motor/pump. Where would I make those connections?

    Does this setup mean I will not be able to also power a 115v device in the L2-L4 inputs of the relay (aka all devices on the relay must be 230v once I wire in this manner)?

    Thanks again!!!

    Primarily, you should double check your pump! If the pump needs two live wires and a neutral, my sketch is not applicable! Perhaps you could take some pictures of the pump and its identification plate?

    And yes, you’ll need a snubber!

    Assuming your pump doesn’t need a neutral wire (hence, my sketch is applicable) you could connect three other switched circuits with 115V AC consumers at the three spare outputs. This is possible because you‘re switching ONE live wire („L1“) of your pump with the Shelly pro 4PM. The other three switches would activate 115V consumers via L1 and neutral.

    But please check your pump at first!

    „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)

    „Es reicht nicht“, rief Schiller, „Gedankenfreiheit zu fordern, man muß auch denken können, sonst fordert man Gedankenlosigkeitsfreiheit und die ist die Freiheit zur Dummheit, welche wiederum die schlimmste Unfreiheit überhaupt ist!“
    (Aus „Besuch aus Weimar“ von Gert Heidenreich, Schriftsteller, *1944 in Eberswalde)

    • Autor

    Ok I looked back at the current setup and you are correct in that there are only 3 wires going to the pump (ground plus 2 live). Now that we have that determined, was my description of your sketch correct? Also where would I attach the snubber?

    Thanks again

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