In smaller greenhouses, a manual program opened and closed by hand could be installed. These work easiest when the screen materials is backed by a track system.

Start time – when in the morning will the screen system start operation
Stop time – when in the afternoon will the display system stop operation
Light level – at what light intensity will the screen be activated either to open up or close
Maximum/minimum temperature – what are the limitations of temperature desired
Maximum/minimum humidity – What exactly are the limits of humidity desired
Gap positions – this pieces the percent open or close placement under different conditions such as in early stages a winter morning to reduce thermal shock or during the summer to provide better shading. The gap methods and speed of motion can be controlled in some systems.
Time delay – below changeable climate this avoids frequent starting and closing
Wind speed – To lessen heat loss, the screen can be closed early below high wind speed conditions
Snow detection – this may open the display screen and turn on the heat when it starts to snow.
The typical system uses nylon monofilament or stainless cables to support the screen materials. The screen material can possibly rest along with the network of cables or end up being suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that techniques the industry leading of the screen materials. Control is definitely either with a manual change or electronic controller.

Based on the above, the grower is required to enter the next Rack Drive For Greenhouse parameters in to the controller:

A weather station is required to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.