ebode RMV Motor Drive Wall Switch
Install a RMV (our part No 12844) to control your projector screen. The RMV is designed for controlling screens that move up and down, or shutters that move left and right.
Remove your existing switch and replace it with the RMV. The RMV has inputs for Positive, and Neutral, and outputs for "up" and "down". These should correspond with the wires you already have at the old switch.
It should be noted that the RMV is an analogue device that uses approximate timings for the open and close duration. Therefore it is neccasary to set the screen's lower limiter to stop the screen where you actually want it. To do this you should wind the screen up, adjust the down travel limiter by half a turn, drop the screen and check where it stops, raise the screen again, adjust by half a turn, drop the screen and check - repeat until happy with setting, don't make more than half a turn adjustment at a time etc and don't adjust the down limiter without having retracted the screen fully first
Whilst the RMV is a European shaped module, it will fit into a 47mm UK backbox