In smaller sized greenhouses, a rack drive for greenhouse china manual program opened and closed yourself could be installed. These work easiest when the screen materials is backed by a track system.
Start time – when each morning will the screen system start operation
Stop period – when in the afternoon will the display screen system stop operation
Light level – in what light strength will the screen become activated either to open up or close
Maximum/minimum temperature – what exactly are the limits of temperature desired
Maximum/minimum humidity – What exactly are the limits of humidity desired
Gap positions – this sets the percent open or close position under different circumstances such as in early stages a winter morning to reduce thermal shock or during the summer to supply better shading. The gap methods and speed of motion can be controlled in some systems.
Time delay – below changeable climate this avoids frequent opening and closing
Wind speed – To reduce warmth loss, the screen could be closed early below high wind speed conditions
Snow detection – this may open the display screen and turn on heat when it begins to snow.
The standard system uses nylon monofilament or stainless cables to support the screen materials. The screen material can either 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 movements the industry leading of the screen material. Control can be 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 needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.