on delay timer circuit

Discussion in 'The Projects Forum' started by Jonplynch, Jan 28, 2012.

  1. Jonplynch

    Thread Starter New Member

    Jan 28, 2012
    23
    0
    can anybody help me in regards to an on delay timing circuit.

    what i am trying to do is the following when a start button is pressed it operates a relay which in turn operates the timer and when the timer times out it lights a beacon. the trouble i am having is that i am not 100% sure on the wiring on my first attempt on doing it the circuit worked but only if i keep my finger on the start button as soon as i relase it all power 2 the circuit drops out and it wont latch and i dont know why i also have a nc stop button working as a reset and this is working fine but as mentioned i have to keep the stop button depressed any help on wiring diagram would be most appreciated
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,421
    3,355
    Please provide a circuit diagram.
     
  3. Jonplynch

    Thread Starter New Member

    Jan 28, 2012
    23
    0
    i am using an omron 230v relay with base a no push button and a normally closed push button i cannot submit diagram just now as i am not sure on the operation of the relays contacts. do i need to power the coil from a different source and then wire the start through the common and no pole on the relay or what ?
     
  4. Jonplynch

    Thread Starter New Member

    Jan 28, 2012
    23
    0
  5. williamj

    Active Member

    Sep 3, 2009
    180
    32
    Jonplynch,

    The specifications for the relay displayed in the url provided, states the the relay is a single pole double throw (SPDT)relay. What you need for latching is a double pole double throw (DPDT) relay.

    With the imformation provided I drew up a couple of drawings (one wire diagram and one ladder diagram) of what I think you were after.

    I don't know what your project is but in the future I highly recomend using relays and timers with a lower voltage coil than the voltage rating of the contacts. That's why relays were invented... to use a lower voltage to control a higher voltage. It's much safer that way.

    williamj
     
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