In smaller sized greenhouses, a manual program opened and closed yourself could possibly be installed. These work rack drive for greenhouse china simplest when the screen materials is backed by a track system.
Start time – when each morning will the display 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 or close
Maximum/minimum temperature – what exactly are the limitations of temperature desired
Maximum/minimum humidity – What exactly are the limitations of humidity desired
Gap positions – this sets the percent open or close position under different circumstances such as in early stages a winter early morning to lessen thermal shock or through the summer to supply better shading. The gap techniques and speed of movement can be controlled in some systems.
Time delay – below changeable climate this avoids frequent opening and closing
Wind speed – To lessen heat loss, the screen can be closed early below high wind speed conditions
Snow detection – this can open the display screen and turn on the heat when it starts to snow.
The typical system uses nylon monofilament or stainless cables to aid the screen materials. The screen material can possibly 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 movements the leading edge of the screen material. Control is either with a manual switch or electronic controller.
Based on the above, the grower must enter the following parameters into the controller:
A climate station is required to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.