how to connect mains operated mini water pump to a relay

Discussion in 'The Projects Forum' started by anju_a_sagar, Dec 31, 2007.

  1. anju_a_sagar

    Thread Starter New Member

    Dec 26, 2007
    4
    0
    hi everyone...can anyone tell me how to connect the mini water pump (live and neutral wires and ground) to a relay.I am using the following relay and pump..relay is operated on 5vdc supply and pump is operated on mains.

    http://relays.tycoelectronics.com/schrack/pdf/PB.pdf
    many thanks
    anju:confused:
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    The document you linked to covers many models of the PB series relay:
    PB114xxx
    PB134XXX
    PB314xxx
    PB334xxx
    where: "xxx" = 005, 006, 012, 024, indicating the voltage of the coil.
    The configuration of the contacts is different depending upon the 2 digits following "PB"

    Additionally, this relay is designed for installation into a printed circuit board. If you are not planning on either making, or having a printed circuit board made for it, you should return it and get one that is designed for screw-type terminals.

    Wiring into the mains can be very dangerous, to both lives and property. If you are not sure of what you are doing, I strongly urge you to contact a licensed electrician to do it for you.

    You will need more than just a relay.
     
  3. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    First you need to verify that your pump will not draw more current than the contacts of your relay are rated for.

    Connect any low voltage control circuitry to the coil of your relay. (pins A and B)

    Next, you need to make certain the breaker for your mains circuit is shut off. Then check the mains with a meter to make absolutely certain.

    Connect the ground lead of your pump to the ground lead of the mains. Connect the neutral lead of your pump to the neutral lead of the mains.
    Connect the hot lead of the pump to the relay "normally open" or "normally closed" lead, depending on your needs. (pin 12 or pin 14)
    Connect the hot lead of the mains to the "common" lead of the relay. (pin 11)

    Triple-check your connections.
    Turn the breaker back on.
    Test your pump motor control.

    If ANY of the above does not make sense, get a licensed electrician. Your life and health are worth more than a few hours pay!
     
  4. anju_a_sagar

    Thread Starter New Member

    Dec 26, 2007
    4
    0
    hi thingmaker3..sorry in my water mini pump there are only 2 wires (live : brown and neutral:blue) how can i connect now ?
     
  5. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    IF your pump has a "double insulated case," then connect same as above, but without ground connection.

    If your pump does NOT have a "double insulated case," then consult an electrician.
     
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