Am I using these relays correctly??

Discussion in 'The Projects Forum' started by Davemarz, Feb 5, 2013.

  1. Davemarz

    Thread Starter New Member

    Feb 4, 2013
    4
    0
    The schematic attached has a couple of relays. The intent here is that when the solenoid is active the electromagnet should be off. Only by turning off the solenoid can the electromagnet be turned on. If the electromagnet is on and the solenoid is activated then the electromagnet should shut off. Also, when the main power (SW1) is turned off then back on everything resets so that the solenoid and the electromagnet are both off.

    What I am wondering is:
    1) Am I using the relays correctly??
    2) Is there a way to combine SW2 and SW3 into one switch??
    3) My loads are pretty robust but should I put something after the relays to protect them??

    Input voltage is standard US wall outlet
    All part numbers listed below are from Digikey.
    ID DESCRIPTION PN

    SW1 DPST M2021SS1W01-ND
    SW2 SPNC CKN2027-ND
    SW3 SPNO CKN9698-ND
    SW4 4PDT 360-1876-ND
    D1 LED 350-2128-ND
    RLY LATCHING RELAY PB1085-ND

    AC/DC CONVERTER 12VDC 20W 102-2612-ND
    SOLENOID 12VDC 30mA
    ELECTROMAGNET 12VDC 80mA
    CAMERA 12VDC 150mA
    BOARD POWER 12VDC 420mA
     
    Last edited: Feb 5, 2013
  2. #12

    Expert

    Nov 30, 2010
    16,346
    6,833
  3. #12

    Expert

    Nov 30, 2010
    16,346
    6,833
    On the S2/S3 idea, you have a momentary, N.O. for SW3 and a momentary, N.C. for SW2. I am really struggling to think of a way to have 2 momentary functions in a single button. I don't think you can buy those. That would be (off)-none-(on) for a toggle switch with both momentary and one normally closed.

    I also think you labeled the switches in the schematic as if both units marked SW3 are the same switch and share the same pushbutton. I think that's impossible, so I would ask you to change the labels to reduce confusion.
     
    Last edited: Feb 5, 2013
  4. Davemarz

    Thread Starter New Member

    Feb 4, 2013
    4
    0
    #12, thanks for your suggestions. See the attachment, I have made some updates. Looking at a different relay that is a bit simpler than the original one I was playing with.

    ID DESCRIPTION PN

    SW1 DPST M2021SS1W01-ND
    SW2, SW4 SPNC CKN2027-ND
    SW3, SW5 SPNO CKN9698-ND
    SW6 4PDT 360-1876-ND
    D1, D2, D3, D4 LED 350-2128-ND
    RLY Relay DPDT 2A 24V PB1551-ND
    AC/DC CONVERTER 12VDC 20W 102-2612-ND

    SOLENOID 12VDC 30mA
    ELECTRO MAGNET 12VDC 80mA
    CAMERA 12VDC 150mA
    BOARD POWER 12VDC 420mA
     
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