RickN (Customer) asked a question.

August 7, 2023 at 5:27 PM
I have two 120Vac,1hp well pumps controlled by the ordinary pressure switches. They operate independently, but there is only one 120Vac cable available. I need to control them separately but not simultaneously, because of the current limitations.

I need advice on what PLC and I/o module to use.

  • 7 answers
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RickN likes this.

  • Todd Dice (Customer)

    1. If you don't already have, you'll need motor contactors to handle the motors' amperage load. Outputs of PLC's are normally 1/2-amp or less.
    2. What is the output of the pressure switch?.0-10V? 4-20ma?
    3. You'll code the PLC so only one pump can operate at a time.
    4. This could be handled by a Click but if you anticipate in the future needing tracking of operation, etc. go with a BRX or a Productivity 1000.
    Expand Post

  • RickN (Customer)

    Thanks, Todd!

    The pressure switches operate 120 Vac contacts.

  • RickN (Customer)

    Yes, I have two 120 Vac contactors for the pumps.

  • RickN (Customer)

    The contactor coils are also 120 Vac.

    • Todd Dice (Customer)

      @OkiePC (Customer)​'s solution is by far the simplest with no PLC needed.

 

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