In smaller greenhouses, a manual system opened and closed by hand could be installed. These work simplest when the screen material is backed by a monitor system.
Start time – when each morning will the display screen system start operation
Stop time – when in the afternoon will the screen 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 limits of temperature desired
Maximum/minimum humidity – What are the limitations of humidity desired
Gap positions – this models the percent open or close position under different circumstances such as in early stages a winter early morning to Motor Gearboxes For Greenhouse lessen thermal shock or during the summer to supply better shading. The gap techniques and speed of motion can be controlled in a few systems.
Time delay – under changeable weather conditions this avoids frequent starting and closing
Wind speed – To lessen warmth loss, the screen could be closed early below high wind speed conditions
Snow detection – this can open the display screen and turn on heat when it begins to snow.
The typical system uses nylon monofilament or stainless cables to aid the screen material. 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 leading edge of the screen materials. Control can be either with a manual change or electronic controller.
Based on the over, the grower must enter the next parameters in to the controller:
A climate station is needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.