Elevator Project (HNC)

Discussion in 'Homework Help' started by joshnmike, Nov 24, 2010.

  1. joshnmike

    Thread Starter New Member

    Nov 24, 2010
    Hey Guys,

    Could anyone help us with a project. we have to build a four story lift using relays and proximety sensors. could anyone help us with this?:confused:
  2. JDT

    Well-Known Member

    Feb 12, 2009
    Not really build it - you mean explain how it could be done? Or are you going to build a miniature version?

    Nowdays the control would be done with a PLC. It could be done with "relay logic" - that's how they used to do it - I expect.

    The complete system is going to be quite complicated. Start by listing your inputs:-

    • Call buttons on each floor
    • Proximity sensors on each floor - to detect that the lift is there
    • A button panel in the lift car - minimum 4 buttons - one for each floor
    And outputs:-

    • Motor forward
    • Motor reverse
    • Acknowledgement lamps in all buttons
    Start with a simple relay "hold" circuit: Energise a relay using a button. A contact on the relay takes over from the button and holds the relay energised. The relay is de-energised by another relay opening a contact...

    As I say going to be complicated!