The Characteristic of Variable Frequency Drive for Water Flow Control in the SFC Plant

One of several techniques to control fluid flow-rate through a pump is using variable frequency drive.  This paper presents how experiment be able to perceive the characteristic of variable frequency drive (VFD) to control water flow-rate in the Simulator Flow Control (SFC) plant. The SFC plant is developed for a fluid course learning simulator. The user would be able to set the desired value of frequency or flow-rate through a convenient interface. To provide it, the characteristic of VFD-frequency-to-flow-rate must be firstly observed, as reported in this paper. The fluid flow-rate control is designed without an electric valve, but using VFD to drive the 250 Watt water pump. In this first development, the SFC Plant successfully work with various water flow-rate from 2 Liter per minute until 20 Liter per minute by changing the frequency input of VFD. The water flow-rate was measured by manual rotameter, the flow sensor has not been applied yet in this first development. In this experiment, the VFD’s frequency was set from 10 Hz to 36 Hz with 2 Hz intervals. Result showed that VFD frequency is proportional to water flow-rate. The higher frequency given to VFD, the faster rotational motor of water pump generated and then given rise to water flow-rate. Using linear graphic approach, the characteristic is shown through the linearity coefficient of 0,68 and constant value of 3.43. This characteristic value would be useful for open-loop-control and user interface programming in next step of development

Rancang Bangun Prototipe Sistem Otomatisasi Retractable Roof Untuk Pengendalian Intensitas Cahaya Pada Smart Green House

Kekurangan cahaya matahari akan mengganggu proses fotosintesis dan pertumbuhan tanaman. Jumlah kebutuhan pada tiap tanaman tergantung pada kebutuhan tumbuhan. Kekurangan cahaya akan menimbulkan gejala etiolasi, yaitu batang akan tumbuh lebih kecil dan berwarna pucat (tidak hijau). Oleh karena itu Sistem Retractable Roof menjadi solusi untuk permasalahan tersebut. Sistem ini dilengkapi dengan Grow LED yang mampu memberikan intensitas cahaya berbeda sesuai dengan jenis tanaman, sebagai contoh Pakcoy membutuhkan cahaya 12000 lux dan Selada membutuhkan cahaya 4305 lux. Hasil dari variasi Grow LED tersebut dihasilkan dengan memanfaatkan putaran Dimmer yang dikendalikan oleh Arduino Mega, kebutuhan intensitas cahaya (BH1750) yang kemudian mampu dimonitor melalui Website. Retractable Roof bekerja otomatis berdasarkan mode semai dan tanam.sehingga dapat dilihat respon nilai intensitas cahaya yang menyesuaikan dengan Motor Servo dan Growing LED. Hasil pengujian dari Intensitas Cahaya pagi hingga sore hari yang sesuai dengan Tabel 4.5. Dimana jika nilai Lux kurang dari Setpoint yaitu 5000, maka Dimmer akan membuat sudut yang telah dijumlahkan dengan nilai Lux yang ada pada jam tersebut lalu jika Lux <.=100 maka Dimmer akan menunjukkan sudut 225 atau maksimal. ===================================================================================================== Lack of sunlight will interfere with the process of photosynthesis and the growth of plants. The amount of needs on each plant depends on the needs of plants. Lack of light will cause symptoms of ethiolasi, i.e. the stem will grow smaller and pale (not green). Therefore, Roof Retractable System is the solution to the problem. The system is equipped with Grow LED that can provide light intensity differ according to the type of plant, for example, Pakcoy needs light 12000 lux, and Lettuce requires light 4305 lux. The result of the Variation of Grow LED is produced by utilizing dimmer rotation controlled by Arduino Mega, Light Intensity Requirement (BH1750) which is then able to be monitored through the Website. Retractable Roof works automatically based on seed and Planting Modes so that it can be seen the response of light intensity values that adjust to the Servo Motor and Growing LED. Test results from Morning to Afternoon Light Intensity following Table 4.5. Where if the Lux value is less than setpoint which is 5000, then Dimmer will create an angle that has been summed up with the existing Lux value in that hour, and then if Lux <.=100 then dimmer will show angle 225 or maximum