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-frequencyto-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.
Pencatatan downtime di beberapa industri menengah masih menggunakan sistem manual (misalnya pada PT. Jatim Autocomp), yaitu berdasarkan perhitungan lama waktu terjadinya downtime di area konveyor menggunakan stopwatch dan dicatat pada papan laporan setiap 2 jam sekali. Untuk itu dibuatlah sistem yang mempermudah pegawai pada proses pemantauan waktu downtime pada konveyor secara otomatis. Metode yang digunakan untuk mendapatkan waktu selama downtime yaitu dengan cara menghitung selisih antara waktu selesai downtime dikurangi dengan waktu pertama mengalami downtime. Data yang didapat akan dikelola oleh Arduino Mega yang dilengkapi dengan Ethernet Shield dan akan ditampilkan dalam database pada web menggunakan komunikasi Wifi. Sensor yang digunakan yaitu proximity induktif yang diletakkan pada konveyor. Setelah dilakukan pengujian, hasilnya menunjukan bahwa jarak maksimal erthenet shield tanpa penghalang 50 meter dan menggunakan penghalang 40 meter serta lama pencatatatan waktu downtime ± 5 detik dalam pengiriman data ke web.
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