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230V AC to 24V DC

Discussion in 'Power Electronics' started by Hobnob, Mar 30, 2021.

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  1. Hobnob

    Hobnob

    3
    0
    Nov 5, 2014
    Hi all

    I've got a 230V control panel managing pumps and i wanted to monitor and record what happens to them (when they are activated etc) via a 24V DC piece of electronic trickery. What sort of transformer / convertor would i need in between the 2 ?

    Many thanks

    Hobnob
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,154
    2,547
    Nov 17, 2011
    What's that supposed to be? A digital input to a PLC? Please be more specific, more detailed. We have no idea what you have at hand.
     
  3. Hobnob

    Hobnob

    3
    0
    Nov 5, 2014
    Hi Harald

    Thanks for getting back to me. Yes, it's a Siemens Logo PLC (the 6ED1052-1MD08-0BA1 model) with both analogue and digital inputs

    Thanks
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    11,154
    2,547
    Nov 17, 2011
    The "best" solution would be a native AC input for the PLC.
    You could use a 24 V dc power supply. Connect the mains in parallel to the pump'p power, connect the 24 V output to the PLC. A bit of overkill, but quick and not too expensive.
    Or you could use a relay with a 230 V AC (!) coil, connect the coil in parallel to the pump, then connect one contact side to the input of the PLC, the other to a 24 V supply.
     
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