Connecting Garage Door to Beams - Wiring Advice

Discussion in 'The Projects Forum' started by Karl Hammerschmidt, May 29, 2016.

  1. Karl Hammerschmidt

    Thread Starter New Member

    Jun 7, 2015
    4
    0
    Hi There,

    I have a garage door that was installed.
    http://www.et.co.za/dc_blue_digital.html

    I have decided to activate the auto-close feature (with a maximum settable time of 2min). I need to install some infra-red beams to stop it closing on people or cars though. I bought the beams that were suggested with the unit but I cannot figure out the wiring 100%.

    I have attached 4 docs.
    1. NB - Garage door "wiring"
    2. Garage door "full" - this is the full 13 page user manual that includes the "wiring" page. This might be more information then needed so it's just included in case it's needed (and I missed something).
    3. A picture of the garage door circuit.
    4. NB - The beams 1 page instruction manual. I've labeled the wiring point T1;T2 & R1;R2;R3;R4;R5 to make things easier.

    From the instruction manual I take it this is the suggested wiring (but I don't want to blow something):

    TX Beam
    T1 >> 12v- (also labeled "V+" in the picture)
    T2 >> GND

    RX Beam
    R1 >> 12v- (also labeled "V+" in the picture)
    R2 >> GND
    R3 >> Nothing
    R4 >> Nothing
    R5 >> Beam (N/C) (also labeled "INFRA" in the picture)

    Please let me know if I'm correct or if I'm about to fry something :)

    Thanks,
    Karl
     
  2. dl324

    Distinguished Member

    Mar 30, 2015
    3,248
    625
    R4 needs to be wired to GND. You can verify by measuring resistance between R4 and R5 when the beam doesn't hit the receiver.

    Auto close is a double edged sword. I designed one 25 years ago and my Wife got locked out of the house.
     
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,998
    745
    Looks like the garage receiver has terminals for a NC beam, so i would connect the receiver beam to those terminals,
    Com and NC on the beam receiver to NC and gnd on the garage receiver.
     
  4. Karl Hammerschmidt

    Thread Starter New Member

    Jun 7, 2015
    4
    0
    Awesome, thanks guys :) I'll let you know if I start seeing smoke :)
     
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