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Basic task of the whole system is maintaining the optimal parameters in the artificial farming chambers needed for growth of chosen plants. The control parameters covered include: humidity, temperature and illumination.
Physical device configuration of a regulator LB-600 is the following:The measurements realized are through the hytherographs LB-710 connected to two measurement channels. The temperature and humidity measurements in two chambers are realized through the hytherographs LB-710 connected to two measurement channels S300.
Picture 1. Functional block blueprint of controlling the pyranometers |
Humidity regulation is realized by a functor 71 in chamber 1 and by a functor 73 in chamber 2 through binary-transmitter outputs that switch on a humidifier and a dehumidifier, adequately from the outputs A1 and A2 in a package 3, in the chamber 1 as well as A1 and A2 to a package 2, in the chamber 2. Three-joint regulation 3P was used in the system (for the heating and cooling systems). Specific feature of the regulation is the usage of the functors as 39, 3A and 51 as well as 3D, 3E and 53, as the selectors of a set value switched over by a logical status of the functors 31 and 32 adequately. Switching over the set values is synchronized with starting the timers that switch on the lighting.
Temperature regulation is realized by a functor 72 in chamber 1 and by a functor 74 in chamber 2 through the binary-transmitter outputs switching on a heater and a cooler, adequately from the output A4 and A3 on package 3, in chamber 1, as well as A4 and A3 on package 2, in chamber 2. Three-joint regulation 3P was used in the system (for the heating and cooling systems). Specific feature of the regulation is the usage of the functors as 3B, 3C and 52 as well as 3F, 43 and 54, as the selectors of a set value switched over by a logical status of the functors 31 and 32 adequately. Switching over the set values is synchronized with starting the timers that switch on the lighting.
The timers switching on the lighting and switching over the set values of humidity and temperature are started by a signal from the Binary Statuses Registry (RSB). The lighting in chamber 1 is switched on with a delay set in a block 41 in relation to a start time (RSB=407, it is a clock alarm 1). The lighting in chamber 2 is switched on with a delay set in a block 42 in relation to a start time (RSB=408, it is a clock alarm 1).
Additionally, also the ventilators work in the system, one in each one of the chambers, and are switched on through the transmitter outputs A5 from the package 2 for the chamber 1 and A5 from a package 3 for chamber 2. The ventilators are switched on from the generators 37 and 38, where the ventilators’ work time was programmed T1 = 900s = 15 minutes along with a break time T2= 7200s = 2 hours is programmed.
Four chambers are served in a plant growing station, from two identical control systems. Both regulators (serving all the chambers) are connected through a converter RS232/RS485 to a computer, where LBX program registers data and allows on changing the parameter values in a control process. |
Picture 2. Internal structure of a controller operating the climate parameters |
SYSTEM PARAMETERS |
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Measurement / control |
Scope of measurement |
Comments |
Temperature measurement |
-40..+60°C |
Chosen scope – possible scope exceeds the scope of applications in farming. |
Humidity measurement |
10..95% RH | Possible to be extended up to
0...100% |
Humidifiers and driers
controlled in a three-joint matter. |
Random |
Through selected for a device transmitters and contractors. |
Heaters and coolers controlled
in a three-joint matter. |
Random | Through selected for the devices transmitters and contractors. |
The ventilators controlled in a
timer function (real time clock). |
Random | Through selected for a device transmitters and contractors. |
The lighting controlled in a
timer function (real time clock). |
Random | Through selected for a device transmitters and contractors. |
Producent: LAB-EL Elektronika Laboratoryjna Sp. J. ul. Bodycha 68b, 02-495 Warszawa tel: (022) 667 71 18, 0601 209656, fax: (022) 867 53 32 poczta elektroniczna: info@label.com.pl witryna internetowa: http://www.label.com.pl internetowa stacja meteorologiczna: http://www.meteo.waw.pl stacja meteorologiczna w komórce: wap.meteo.waw.pl Ostatnia aktualizacja: 05.09.2007 |