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Control of CH pumps by NodeMCU using OMRON G3MB-202P SSR relay

szogun1987 396 1
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #1 20831638
    szogun1987
    Level 11  
    I would like to control the CO pumps from the NodeMCU.
    My idea is as follows:
    The NodeMCU is powered from the USB charger (5V 2A)
    I connect the GPIO output to a "logic level converter" powered from the VCC pin of the NodeMCU)
    The output of the converter controls an SSR relay (OMRON G3MB-202P 5V version) and this controls the pump.

    Is there anything that might not work? I have concerns about whether the VCC from the NodeMCU is enough to reliably power the relay?

    The pump has a power consumption of 40W (unfortunately I can't remember the exact model), so the relay is redundant (2A), but maybe there is another reason why I shouldn't use it.

    I prefer the SSR relay because:
    a) I just happen to have a couple of these unused
    b) the pump connects a large heat buffer (1000l) to a large boiler (17kW holding about 70l). Running the pump causes a large amount of cool water from the bottom of the buffer to exchange the heated water inside, so the temperature quickly drops, then the high power of the cooker quickly heats up a new portion of the water. The operating cycles are short.
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  • Helpful post
    #2 20832178
    1fruit
    Level 12  

    Looking at the datasheet (attached) your relay needs max. 20mA to be driven correctly. You don't write what type of converter you are using, it will depend on its design whether it can deliver this 20mA. The pump relay itself seems to be ok, it switches at zero and has internal 2.5kVAC optoisolation which, with skillful connections, should ensure safe operation.
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