In smaller sized greenhouses, a Rack Drive For Greenhouse manual system opened and closed yourself could be installed. These work simplest when the screen material is supported by a track system.
Start time – when each morning will the display system start operation
Stop time – when in the afternoon will the display system stop operation
Light level – in what light intensity will the screen become activated either to open or close
Maximum/minimum temperature – what are the limitations of temperature desired
Maximum/minimum humidity – What are the limits of humidity desired
Gap positions – this sets the percent open or close placement under different circumstances such as in early stages a winter morning to lessen thermal shock or through the summer to supply better shading. The gap steps and speed of movement can be controlled in a few systems.
Time delay – under changeable climate this avoids frequent starting and closing
Wind speed – To reduce high temperature loss, the screen could be closed early under 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 steel cables to aid the screen materials. The screen material can either rest along with the network of cables or become suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that moves the industry leading of the screen material. Control can be either with a manual change or electronic controller.
Based on the over, the grower is required to enter the following parameters in to the controller:
A climate station is needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.