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Electrical Wire and Cable

Wiring a Up Down Switch for a Electric Projector Screen

By Dave Rongey - Summary:

How to Wire Motorized Big Screen Projector Switch

How to Wire Motorized Big Screen Projector Switch

Electrical Question: I got a big screen that can roll up or down. I bought the relevant switch, up, down and stop buttons, but don’t know how to wire it.

This electrical question came from: Dawie, a Homeowner from Cape Town, Africa.
See more about Home Wiring for Africa

Dave’s Reply:
Thanks for your electrical question Dawie.

How To Wire Motorized Projection Screens
Dawie, first of all, we must understand that there are more than one type of Big Screens or Motorized Projection Screens, and because you did not identify which one you have we will have to cover the different types of Motorized Projection Screens, because it does make a difference with the wiring.

First, let’s cover the Motorized Screen Wiring Techniques and the basic parts that are involved:
The Video Projection Unit
Motorized Roll-Down Screen

Control Options for the Motorized Roll-Down Screen

Types of Control Interface  Switches


All of these types of switches must be compatible with the motorized roll up screen unit that you have, however typical projectors and motorized big screen units have a Control Interface which is the connection point that makes all the functions work.

Connections for a Basic Electric Projection Screen without a control interface –  typical wiring at the screen motor are as follows:

Please Note: Always Identify Your Specific equipment and parts and read your Owners Manual and Installation Manual. The voltage of your specific equipment and the voltage at your specific location may be different. Keep in mind that I am located in the USA, and this question came from Cape Town Africa. All countries do not have the same voltage and electrical systems. See World Electrical Systems


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2 Responses to “Wiring a Up Down Switch for a Electric Projector Screen”
  1. Dave Rongey says:

    Hi Ralph,
    The relay of the WeMo Maker is basically a set of contacts that act as a switch. The wiring of a device such as a motorized screen would be connected to the WeMo Maker for it to be the source of control.
    Please note that the electrical rating of the WeMo Maker relay must be compatible with the motorized projection screen switch circuit to avoid damage to the WeMo Maker.
    I hope this helps,

  2. Ralph Bejjani says:

    I was trying to connect a Wemo Maker to my motorized projection screen but I don’t understand the circuitry I have in front of me.

    Could you please tell me what it is and where to connect my 2 “relay” wires of the Wemo Maker.

    I have pictures of the circuit, let me know how to send them to you.