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    bunnspieshop's Avatar
    bunnspieshop Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Sep 4, 2012, 07:42 AM
    Installing a new alarm control panel (keypad)
    I have to replace the alarm panel (keypad) in my house with a more up to date one. The old one did not have a transformer and was powered by a separate PSU supply providing the 12v supply. The new panel has a built in transformer that should be connected to the mains.

    Is it possible that I can bypass the built in transformer and simply use the existing PSU supply? If so, can I connect the PSU +/- to the AC connections on the board?
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Sep 4, 2012, 12:14 PM
    What Panel do you have? Sounds like the Old keypad may have been the Control Panel/Communicator, and Batteries with a wireless receiver.

    Most Alarm Systems/Control Panels Have a transformer that charges a 12 volt dc battery, that battery provides power for The Panel, Detectors, siren, everything, even when AC fails. These type of Panels need 4 conductors to the Keypad(s).
    Commonly:
    Red B+
    Black B-
    Yellow Data
    Green Data
    One is data in, the other is data out.
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