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All Journal JET (Journal of Electrical Technology) Jurnal Rekayasa Material, Manufaktur & Energi International Journal of Research in Vocational Studies (IJRVOCAS) Journal of Telecommunication and Electrical Scientific Journal of Innovation and Community Engagement
Irfan Nofri
UMSU
Aerospace Engineering Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Control System Design for 3 Storey Elevator Using PLC OPTA FINDER Suparmono; Sitepu, Trahman; Salman, Aulia; Pardede, Sutan; Cholish; Abdullah; Nofri, Irfan
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 4 No. 4 (2024): IJRVOCAS - Special Issues - International Conference on Science, Technology and
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v4i4.384

Abstract

Elevators are a crucial vertical transportation system in multi-story buildings, and the use of an appropriate control system can enhance operational efficiency, comfort, and safety. This study aims to design a control system for a 3-floor elevator using a Programmable Logic Controller (PLC) OPTA FINDER, which offers advantages in flexibility and ease of programming. The design process involved creating a control system schematic, programming with ladder diagrams, and testing on a small-scale elevator model. The test results demonstrated that the system could operate the elevator with fast and accurate response in detecting floor positions, controlling automatic doors, and responding to emergency conditions. Furthermore, the PLC OPTA FINDER proved reliable in managing elevator system components and facilitating program modifications without requiring hardware changes. This control system also contributes to energy efficiency through optimized motor speed regulation. Thus, the implementation of the PLC OPTA FINDER provides an effective and safe solution for modern elevator control systems.
Karakteristik Gugus Fungsi dan Kekuatan Impak Material Komposit Berpenguat Serat Serbuk Daun Nanas Tanjung, Iqbal; Lubis, Riadini Wanty; Nofri, Irfan; ., Affandi; Siregar, Chandra A; Siregar, Ahmad Marabdi; Efrida, Rizki
Rekayasa Material, Manufaktur dan Energi Vol 8, No 2: JULI 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i2.25533

Abstract

The objective of this study is to investigate the impact strength and functional group characteristics, as identified through FTIR spectroscopy, of composite materials reinforced with pineapple leaf powder fibers that have undergone physical property enhancement via alkali treatment (NaOH). A series of processes were conducted to produce the pineapple leaf powder, starting with drying fresh pineapple leaves until they turned brown. The dried leaves were then cleaned and soaked in a 5% NaOH solution for durations of 1, 3, 5, 7, and 9 hours to modify their physical properties. After treatment, the leaves were rinsed thoroughly and oven-dried at 60°C for 5 hours. The dried leaves were subsequently ground and sieved using a 150-mesh screen. This study involved two main observations: functional group analysis using FTIR spectroscopy and mechanical performance evaluation through impact testing. A total of 30 composite specimens were prepared and fabricated using a stepwise lamination method, following the ASTM D256 impact testing standard. The results indicate that alkali treatment progressively degraded the hemicellulose and lignin content in the pineapple leaf fibers, significantly enhancing the impact energy absorption of the composite material. However, extended treatment durations adversely affected the fiber quality, leading to structural damage and reduced interfacial cohesion between the composite components.
Analisis Kinerja Mitigasi Total Harmonic Distortion (THD) dan Kualitas Daya Listrik untuk Beban Residensial Non-Linier: Analisis Kinerja Mitigasi Total Harmonic Distortion (THD) dan Kualitas Daya Listrik untuk Beban Residensial Non-Linier fadlan, fadlan; nofri, irfan; Rohana, R
Journal of Telecommunication and Electrical Scientific Vol. 2 No. 02 (2025): Journal of Telecommunication and Electrical Scientific (JTElS)
Publisher : Universitas Harapan Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24010/jtels.v2i02.1266

Abstract

Distorsi Harmonisa akan dihasilkan oleh beban tidak linier seperti televisi, komputer, microwave, lampu – lampu flourescent yangterdapat dan menggunakan ballas elektronik dan kandungan elektronik lainnya. harmonisa yang terdapat pada jenis beban tidak linier menyebabkan kualitas daya listrik menjadi buruk dan mutu pada mutu pengukuran daya listrik menjadi tidka optimal dan sering menyebabkan daya menurun. Beban residentil non-linier akan menghasilkan harmonisa. Dari hasil pengukuran beban tersebut memiliki faktor daya sebesar 5,53, dimana kandungan harmonisa pada orde ke 3 sebesar 62,7%, orde ke 5 sebesar 33,5%, orde ke 7 sebesar 21,4%, orde ke 9 sebesar 20,3%, orde ke 11 sebesar 9,4%, dan THDi sebesar 70,2%. Berdasarkan pada data tersebut maka perlu dilakukan pengurangan kandungan harmonisa dengan dilakukan penambahan filter. Simulasi ini mengetahui nilai yang terdapat pada beban residensial non-liner sehingga menggangu kerja kualitas daya listrik dan terdapat harmonisa
ANALISIS PENGARUH JUMLAH SUDU TURBIN TERHADAP KELUARAN DAYA LISTRIK PADA PEMBANGKIT LISTRIK PIKO HIDRO sawirman; nofri, irfan
Journal of Telecommunication and Electrical Scientific Vol. 2 No. 02 (2025): Journal of Telecommunication and Electrical Scientific (JTElS)
Publisher : Universitas Harapan Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24010/jtels.v2i02.1269

Abstract

Turbin air merupakan suatu peralatan konversi energi fluida kerja air dan salah satu jenis turbin air diantaranya adalah turbin pelton. Turbin pelton adalah jenis turbin air yang digunakan pada tinggi jatuh air yang besar dikarenakan jenis turbin ini menggunakan nosel hingga menghasilkan energi listrik yang besar pula. Dalam mencapai performa kinerja dari turbin pelton, sudu mempunyai peranan penting dikarenakan pemanfaatan energi air yang di tembakkan Nosel ke titik lingkaran tusuk ini dilakukan dua kali, yang pertama energi pancaran air pada sudu-sudu pada saat air mulai masuk, dan yang kedua adalah daya dorong air pada sudu-sudu saat air akan meninggalkan runner. Adapun yang menjadi tujuan umumnya untuk mengetahui pengaruh jumlah sudu terhadap unjuk kerja Turbin Pelton. Adapun tujuan khususnya (1) Mendapatkan nilai torsi yang terjadi pada poros. (2) Menghitung daya yang dihasilkan kerja Turbin. (3) Menganalisa nilai efisiensi dari kerjaTurbin. Metode yang digunakan untuk menghitung daya turbin adalah dengan cara membaca pergerakan pertambahan beban yang terjadi setelah turbin berputar. Sebelum turbin berputar beban dihitung dulu berat awalnya. kemudian setalah turbin berputar catat pertambahan berat beban. Dan lakukan pengamatan kecepatan putar turbin saat poros berputar. Pada hasil pengujian optimal pada jumlah 20 Bucket dengan putaran = 583,1 Rpm, Daya = 55,53 Watt , Torsi = 13,53 Nm dan Efisiensi = 1,43 %.
ANALISIS KUANTITATIF KONTRIBUSI DAYA REAKTIF KABEL TANAH 20 KV TERHADAP PROFIL TEGANGAN DAN EFISIENSI SISTEM DISTRIBUSI MENGGUNAKAN METODE GAUSS–SEIDEL BERBASIS MATLAB azis, abdul; Nofri, Irfan; Pasaribu, Faisal Irsan; Pangestu, Adam; Cholish, C
JET (Journal of Electrical Technology) Vol 11, No 1 (2026): EDISI FEBRUARI
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/jet.v11i1.13495

Abstract

Penelitian ini mengevaluasi kontribusi daya reaktif kabel tanah tegangan menengah 20 kV jenis XLPE terhadap profil tegangan dan rugi-rugi daya pada sistem distribusi PT PLN (Persero) Kota Subulussalam. Sistem radial dimodelkan dan dianalisis menggunakan metode aliran daya Gauss–Seidel berbasis MATLAB. Data operasional berupa arus, tegangan, faktor daya, dan parameter kabel digunakan untuk menghitung daya aktif, daya reaktif, serta rugi-rugi daya pada setiap bagian sistem. Hasil menunjukkan bahwa sistem beroperasi dalam batas stabilitas tegangan (0,95–1,05 pu). Distribusi beban tidak merata, dimana bagian B memiliki pembebanan tertinggi dan rugi-rugi daya terbesar. Sistem menunjukkan dominasi daya reaktif dengan faktor daya sebesar 0,8. Kontribusi daya reaktif dari kabel tanah mencapai ±7% hingga ±12% dari total daya reaktif sistem akibat sifat kapasitifnya. Rugi-rugi daya pada bagian A, B, dan C masih berada dalam batas normal (2–3%), namun meningkat signifikan pada bus beban akibat akumulasi pembebanan. Temuan ini menunjukkan bahwa kabel tanah tidak hanya berfungsi sebagai penghantar energi listrik, tetapi juga sebagai sumber daya reaktif yang mempengaruhi kinerja sistem distribusi. Oleh karena itu, pengelolaan daya reaktif dan pemerataan beban diperlukan untuk meningkatkan efisiensi sistem tenaga listrik.
PLTS 200 Wp to Meet Energy Needs at the Taqwa Muhammadiyah Mosque, Sei Litur Village, Sawit Sebrang Langkat District Partaonan Harahap; Irfan Nofri; Sudirman Lubis
Journal of Innovation and Community Engagement Vol. 1 No. 1 (2021)
Publisher : Faculty of Smart Technology and Engineering, Universitas Kristen Maranatha, Bandung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jice.v1i1.3380

Abstract

At the Taqwa Muhammadiyah Mosque, a local place of worship, the power blackout is becoming very troublesome. On one side of the village where the research was conducted, the light intensity was high enough so that it is very good to be used as a source of renewable energy, namely solar panels or better known as PLTS. Method used in this research is experiment which is fully functional to control the implementation of the solar panel for electricity supply for the Mosque everyday activity Based on the results of measurements and calculations, the 200 Wp solar panel, when the weather is sunny, will be able to charge a battery by 68.2% or 87.2 Watts. In using the battery, the efficiency factor of the battery must be considered because it cannot be operated until all power is used up. Battery Capacity is 754.7 Ah and is able to supply DC lamps for 1 day and is able to supply AC loads for 1.02 day. So in 11 hours (lowest data) the 200WP solar panel is able to charge a battery with a capacity of 100Ah at 80% of the full battery capacity. Keywords: generator; PLTS; solar cell
Co-Authors Abdul Azis Abdullah Adam Pangestu Affandi . Ahmad Marabdi Siregar Cholish Efrida, Rizki Fadlan Fadlan Lubis, Riadini Wanty Pardede, Sutan Partaonan Harahap Pasaribu, Faisal Irsan Rohana, R Salman, Aulia Sawirman Siregar, Chandra A Sitepu, Trahman Sudirman Lubis Suparmono Tanjung, Iqbal