In smaller sized greenhouses, a manual system opened and closed by hand could be installed. These work easiest when the screen material is backed by a track system.
Start time – when in the morning will the screen system start operation
Stop period – when in the afternoon will the screen system stop operation
Light level – at what light strength will the screen be activated either to open or close
Maximum/minimum temperature – what are the limits of temperature desired
Maximum/minimum humidity – What exactly are the limitations of humidity desired
Gap positions – this sets the percent open or close placement under different conditions such as in early stages a winter early morning to lessen thermal shock or through the Motor Gearboxes For Greenhouse summer to provide better shading. The gap steps and speed of movement can be controlled in a few systems.
Time delay – under changeable weather conditions this avoids frequent starting and closing
Wind speed – To reduce temperature loss, the screen could be closed early below high wind speed conditions
Snow detection – this may open the display screen and turn on the heat when it begins to snow.
The typical system uses nylon monofilament or stainless cables to aid the screen materials. The screen material can either rest along with the network of cables or be 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 switch or electronic controller.
Based on the over, the grower must enter the next parameters into the controller:
A climate station is needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.