{"id":539,"date":"2026-10-07T11:44:38","date_gmt":"2026-10-07T11:44:38","guid":{"rendered":"https:\/\/otomasiplcbandung.com\/?p=539"},"modified":"2026-10-09T14:50:56","modified_gmt":"2026-10-09T14:50:56","slug":"bab-11","status":"publish","type":"post","link":"https:\/\/otomasiplcbandung.com\/?p=539","title":{"rendered":"BAB 11 # BELAJAR PLC DASAR PLC, INVERTER DAN MOTOR INDUSTRI"},"content":{"rendered":"\n

PLC, INVERTER\/VFD, DAN MOTOR INDUSTRI<\/h1>\n\n\n\n

1. Mengapa teknisi PLC perlu memahami inverter?<\/h2>\n\n\n\n

Di pabrik, PLC sering tidak langsung mengendalikan motor.<\/p>\n\n\n\n

Salah satu sistem yang umum adalah:<\/p>\n\n\n\n

\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 SENSOR  \u2502\n\u2514\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2518\n     \u2193\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502   PLC   \u2502\n\u2514\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2518\n     \u2193\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 VFD \/   \u2502\n\u2502 INVERTER\u2502\n\u2514\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2518\n     \u2193\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 MOTOR   \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n<\/code><\/pre>\n\n\n\n
PLC menentukan kapan motor bekerja dan bagaimana proses dikendalikan<\/strong>, sedangkan VFD mengatur motor sesuai kemampuan dan parameter yang telah dikonfigurasi.<\/p>\n\n\n\n
\n\n\n\n
2. Apa itu VFD?<\/h1>\n\n\n\n
VFD (Variable Frequency Drive)<\/strong> adalah perangkat elektronik yang dapat mengendalikan motor AC dengan mengatur frekuensi dan tegangan keluarannya sesuai desain.<\/p>\n\n\n\n
Secara sederhana:<\/p>\n\n\n\n
AC SUPPLY\n    \u2193\n   VFD\n    \u2193\nFREKUENSI DIKENDALIKAN\n    \u2193\n  MOTOR\n<\/code><\/pre>\n\n\n\n
Contoh sederhana:<\/p>\n\n\n\n
50 Hz \u2192 motor berputar pada kecepatan tertentu\n\n30 Hz \u2192 motor lebih lambat\n<\/code><\/pre>\n\n\n\n
Tetapi kecepatan aktual motor tidak hanya ditentukan oleh frekuensi; slip, jenis motor, beban, dan konfigurasi drive juga berpengaruh.<\/p>\n\n\n\n
\n\n\n\n
3. Hubungan PLC dengan VFD<\/h1>\n\n\n\n
Ada beberapa cara komunikasi\/perintah antara PLC dan VFD.<\/p>\n\n\n\n
Untuk dasar, kita mulai dari cara yang paling mudah dipahami:<\/p>\n\n\n\n
Cara 1 \u2014 Digital signal<\/h3>\n\n\n\n
PLC memberikan perintah:<\/p>\n\n\n\n
RUN\nSTOP\nFORWARD\nREVERSE\n<\/code><\/pre>\n\n\n\n
Cara 2 \u2014 Analog reference<\/h3>\n\n\n\n
PLC memberikan referensi kecepatan, misalnya melalui sinyal analog yang didukung sistem:<\/p>\n\n\n\n
PLC\n \u2193\nAnalog output\n \u2193\nVFD\n \u2193\nSpeed reference\n \u2193\nMotor\n<\/code><\/pre>\n\n\n\n
Cara 3 \u2014 Komunikasi jaringan<\/h3>\n\n\n\n
PLC dan VFD dapat bertukar data melalui protokol jaringan industri yang sesuai.<\/p>\n\n\n\n
PLC\n \u2195\nNETWORK\n \u2195\nVFD\n<\/code><\/pre>\n\n\n\n
Cara ketiga sangat menarik untuk teknisi yang mendalami PLC, HMI, dan SCADA karena status dan parameter drive dapat dipantau melalui sistem kontrol.<\/p>\n\n\n\n
\n\n\n\n
4. Contoh sistem sederhana<\/h1>\n\n\n\n
Kita buat contoh conveyor.<\/p>\n\n\n\n
Sensor\n  \u2193\nPLC\n  \u2193\nRUN command\n  \u2193\nVFD\n  \u2193\nMotor\n  \u2193\nConveyor\n<\/code><\/pre>\n\n\n\n
Kemudian operator menggunakan HMI:<\/p>\n\n\n\n
HMI\n \u2502\n \u251c\u2500\u2500 START\n \u251c\u2500\u2500 STOP\n \u251c\u2500\u2500 SPEED SETTING\n \u2514\u2500\u2500 STATUS\n       \u2193\n      PLC\n       \u2193\n      VFD\n       \u2193\n     MOTOR\n<\/code><\/pre>\n\n\n\n
Sekarang kita sudah mempunyai sistem yang jauh lebih lengkap.<\/p>\n\n\n\n
\n\n\n\n
5. Contoh sequence mesin<\/h1>\n\n\n\n
Operator memasukkan:<\/p>\n\n\n\n
Speed = 35 Hz<\/strong><\/p>\n\n\n\n
Kemudian:<\/p>\n\n\n\n
START\n  \u2193\nPLC menerima perintah\n  \u2193\nPLC memberikan RUN ke VFD\n  \u2193\nVFD menerima RUN\n  \u2193\nVFD menjalankan motor\n  \u2193\nMotor berputar\n  \u2193\nConveyor berjalan\n<\/code><\/pre>\n\n\n\n
Jika operator mengubah speed:<\/p>\n\n\n\n
35 Hz\n \u2193\n45 Hz\n \u2193\nPLC mengirim referensi\n \u2193\nVFD mengubah frekuensi sesuai konfigurasi\n \u2193\nMotor berubah kecepatannya\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
6. Bagian penting: jangan langsung menyalahkan VFD<\/h1>\n\n\n\n
Misalnya motor tidak berputar.<\/p>\n\n\n\n
Operator mengatakan:<\/p>\n\n\n\n
\n
“Inverternya rusak.”<\/p>\n<\/blockquote>\n\n\n\n
Teknisi harus menahan diri untuk tidak langsung mengganti VFD.<\/p>\n\n\n\n
Gunakan urutan:<\/p>\n\n\n\n
SUPPLY\n  \u2193\nPLC\n  \u2193\nRUN COMMAND\n  \u2193\nSPEED REFERENCE\n  \u2193\nVFD STATUS\n  \u2193\nOUTPUT VFD\n  \u2193\nMOTOR\n  \u2193\nMECHANICAL LOAD\n<\/code><\/pre>\n\n\n\n
Cari titik pertama yang tidak sesuai.<\/strong><\/p>\n\n\n\n
\n\n\n\n
7. Troubleshooting tahap pertama \u2014 supply<\/h1>\n\n\n\n
Pertanyaan pertama:<\/p>\n\n\n\n
\n
Apakah VFD mendapatkan sumber yang benar?<\/p>\n<\/blockquote>\n\n\n\n
Periksa berdasarkan manual dan prosedur keselamatan.<\/p>\n\n\n\n
Untuk bagian tegangan berbahaya, pengukuran hanya boleh dilakukan oleh personel kompeten dengan alat ukur dan prosedur yang sesuai.<\/p>\n\n\n\n
Jangan membuka atau menyentuh terminal VFD hanya karena ingin melihat apakah ada tegangan.<\/p>\n\n\n\n
\n\n\n\n
8. Troubleshooting tahap kedua \u2014 apakah PLC memberikan RUN?<\/h1>\n\n\n\n
Misalnya:<\/p>\n\n\n\n
HMI START\n   \u2193\nPLC\n   \u2193\nY0 = RUN\n<\/code><\/pre>\n\n\n\n
Periksa dari program PLC:<\/p>\n\n\n\n
START command = ON?\nInterlock = OK?\nSafety condition = OK?\nY0 = ON?\n<\/code><\/pre>\n\n\n\n
Kalau Y0 tidak ON, masalah mungkin belum sampai ke VFD.<\/p>\n\n\n\n
\n\n\n\n
9. Troubleshooting tahap ketiga \u2014 periksa speed reference<\/h1>\n\n\n\n
Misalnya:<\/p>\n\n\n\n
RUN = ON\n<\/code><\/pre>\n\n\n\n
tetapi motor tidak bergerak seperti yang diharapkan.<\/p>\n\n\n\n
Periksa apakah referensi kecepatan benar.<\/p>\n\n\n\n
Contoh konsep:<\/p>\n\n\n\n
Speed setting HMI\n       \u2193\n       PLC\n       \u2193\nAnalog\/network reference\n       \u2193\n       VFD\n<\/code><\/pre>\n\n\n\n
Jika nilai speed reference tidak sampai ke VFD, motor mungkin tidak menerima perintah kecepatan yang diharapkan.<\/p>\n\n\n\n
\n\n\n\n
10. Troubleshooting tahap keempat \u2014 periksa status VFD<\/h1>\n\n\n\n
VFD biasanya menyediakan informasi seperti:<\/p>\n\n\n\n
    \n
  • RUN<\/li>\n\n\n\n
  • STOP<\/li>\n\n\n\n
  • Frequency<\/li>\n\n\n\n
  • Current<\/li>\n\n\n\n
  • Fault<\/li>\n\n\n\n
  • Warning<\/li>\n\n\n\n
  • Output status<\/li>\n<\/ul>\n\n\n\n
    Misalnya HMI menunjukkan:<\/p>\n\n\n\n
    VFD STATUS: READY\nRUN: OFF\nFAULT: NO\n<\/code><\/pre>\n\n\n\n
    Artinya kita perlu mencari mengapa perintah RUN belum diberikan.<\/p>\n\n\n\n
    Contoh lain:<\/p>\n\n\n\n
    VFD STATUS: FAULT\n<\/code><\/pre>\n\n\n\n
    Nah, sekarang perhatian teknisi beralih ke kode fault dan penyebabnya<\/strong>.<\/p>\n\n\n\n
    Jangan sekadar reset.<\/p>\n\n\n\n
    \n\n\n\n
    11. Prinsip penting: baca fault code<\/h1>\n\n\n\n
    Misalnya VFD menunjukkan:<\/p>\n\n\n\n
    FAULT\nE-XXX\n<\/code><\/pre>\n\n\n\n
    Jangan menebak arti kode tersebut.<\/p>\n\n\n\n
    Karena:<\/p>\n\n\n\n
    \n
    Kode fault berbeda antara merek dan model VFD.<\/strong><\/p>\n<\/blockquote>\n\n\n\n
    Teknisi harus membuka manual perangkat yang digunakan.<\/p>\n\n\n\n
    Kemudian:<\/p>\n\n\n\n
    FAULT CODE\n    \u2193\nARTI FAULT\n    \u2193\nKEMUNGKINAN PENYEBAB\n    \u2193\nPEMERIKSAAN\n    \u2193\nPERBAIKAN\n    \u2193\nRESET SESUAI PROSEDUR\n    \u2193\nTEST\n<\/code><\/pre>\n\n\n\n
    Ini adalah pola troubleshooting yang benar.<\/p>\n\n\n\n
    \n\n\n\n
    12. Contoh kasus overload<\/h1>\n\n\n\n
    Misalnya:<\/p>\n\n\n\n
    VFD\n \u2193\nOVERLOAD\n<\/code><\/pre>\n\n\n\n
    Jangan langsung mengatakan:<\/p>\n\n\n\n
    \n
    “Setting inverter salah.”<\/p>\n<\/blockquote>\n\n\n\n
    Periksa beberapa kemungkinan secara sistematis:<\/p>\n\n\n\n
    Motor\n \u2193\nBeban mekanis\n \u2193\nBearing\n \u2193\nConveyor\n \u2193\nKopling\/transmisi\n \u2193\nKabel\n \u2193\nParameter drive\n \u2193\nKondisi operasi\n<\/code><\/pre>\n\n\n\n
    Penyebab sebenarnya harus dibuktikan berdasarkan pengukuran dan pemeriksaan.<\/p>\n\n\n\n
    \n\n\n\n
    13. Contoh kasus motor tidak berputar<\/h1>\n\n\n\n
    Kita buat tabel diagnosis:<\/p>\n\n\n\n
    Pemeriksaan<\/th>Hasil<\/th><\/tr><\/thead>
    PLC hidup<\/td>OK<\/td><\/tr>
    START HMI<\/td>OK<\/td><\/tr>
    RUN command<\/td>ON<\/td><\/tr>
    VFD fault<\/td>Tidak ada<\/td><\/tr>
    Speed reference<\/td>Ada<\/td><\/tr>
    Output drive<\/td>Perlu diperiksa sesuai prosedur<\/td><\/tr>
    Motor<\/td>Belum berputar<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    Sekarang teknisi tahu bahwa masalah sudah melewati PLC dan masuk ke bagian berikutnya.<\/p>\n\n\n\n
    \n\n\n\n
    14. Hubungan HMI dengan VFD<\/h1>\n\n\n\n
    Sekarang sahabatku akan mulai melihat manfaat HMI.<\/p>\n\n\n\n
    HMI dapat menampilkan:<\/p>\n\n\n\n
    \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502      MOTOR CONVEYOR      \u2502\n\u2502                          \u2502\n\u2502 RUN       : ON           \u2502\n\u2502 SPEED     : 35 Hz        \u2502\n\u2502 CURRENT   : ---          \u2502\n\u2502 FAULT     : NONE         \u2502\n\u2502                          \u2502\n\u2502 [ START ] [ STOP ]       \u2502\n\u2502                          \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n<\/code><\/pre>\n\n\n\n
    Teknisi bahkan dapat membuat halaman khusus maintenance:<\/p>\n\n\n\n
    \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502      DRIVE MONITOR       \u2502\n\u2502                          \u2502\n\u2502 Command      : RUN       \u2502\n\u2502 Frequency    : 35 Hz     \u2502\n\u2502 Current      : ---       \u2502\n\u2502 Fault Code   : NONE      \u2502\n\u2502 Ready        : YES       \u2502\n\u2502                          \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n<\/code><\/pre>\n\n\n\n
    Ini sudah mulai masuk ke pemikiran HMI\/SCADA<\/strong>.<\/p>\n\n\n\n
    \n\n\n\n
    15. Dari HMI menuju SCADA<\/h1>\n\n\n\n
    Kalau HMI digunakan di dekat mesin, SCADA dapat digunakan untuk memantau banyak peralatan dari sistem supervisi.<\/p>\n\n\n\n
    Konsep sederhananya:<\/p>\n\n\n\n
    SENSOR\n  \u2193\nPLC\n  \u2193\nVFD\n  \u2193\nMOTOR\n  \u2193\nPLC\n  \u2193\nNETWORK\n  \u2193\nSCADA\n  \u2193\nOPERATOR \/ ENGINEER\n<\/code><\/pre>\n\n\n\n
    SCADA dapat digunakan untuk melihat:<\/p>\n\n\n\n
      \n
    • Status mesin<\/li>\n\n\n\n
    • Alarm<\/li>\n\n\n\n
    • Trend<\/li>\n\n\n\n
    • Data produksi<\/li>\n\n\n\n
    • Status motor<\/li>\n\n\n\n
    • Nilai proses<\/li>\n\n\n\n
    • Histori kejadian<\/li>\n<\/ul>\n\n\n\n
      Dengan demikian data maintenance juga bisa menjadi lebih terstruktur.<\/p>\n\n\n\n
      \n\n\n\n
      16. Trend sangat berguna untuk maintenance<\/h1>\n\n\n\n
      Misalnya SCADA menyimpan data arus motor:<\/p>\n\n\n\n
      Senin    \u2192 normal\nSelasa   \u2192 normal\nRabu     \u2192 naik\nKamis    \u2192 naik\nJumat    \u2192 tinggi\n<\/code><\/pre>\n\n\n\n
      Teknisi dapat melihat bahwa ada perubahan kondisi.<\/p>\n\n\n\n
      Ini jauh lebih baik daripada menunggu:<\/p>\n\n\n\n
      \n
      Motor berhenti total.<\/strong><\/p>\n<\/blockquote>\n\n\n\n
      \n\n\n\n
      17. Contoh preventive maintenance berbasis data<\/h1>\n\n\n\n
      Misalnya:<\/p>\n\n\n\n
      CURRENT\n  \u2191\n  \u2502             \u256d\u2500\u2500\n  \u2502          \u256d\u2500\u2500\u256f\n  \u2502       \u256d\u2500\u2500\u256f\n  \u2502\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2192 TIME\n<\/code><\/pre>\n\n\n\n
      Grafik menunjukkan arus semakin meningkat.<\/p>\n\n\n\n
      Teknisi dapat menjadikan kondisi tersebut sebagai indikasi untuk pemeriksaan<\/strong>, bukan otomatis sebagai diagnosis kerusakan.<\/p>\n\n\n\n
      Kemudian diperiksa:<\/p>\n\n\n\n
        \n
      • Beban mekanis.<\/li>\n\n\n\n
      • Motor.<\/li>\n\n\n\n
      • Bearing.<\/li>\n\n\n\n
      • Alignment.<\/li>\n\n\n\n
      • Conveyor.<\/li>\n\n\n\n
      • Parameter drive.<\/li>\n\n\n\n
      • Kondisi proses.<\/li>\n<\/ul>\n\n\n\n
        \n\n\n\n
        18. Safety tetap nomor satu<\/h1>\n\n\n\n
        Sahabatku, semakin kita masuk ke sistem industri, semakin penting satu prinsip:<\/p>\n\n\n\n
        \n
        PLC, HMI, dan SCADA adalah alat kontrol dan informasi; keselamatan manusia tetap prioritas utama.<\/strong><\/p>\n<\/blockquote>\n\n\n\n
        Jangan melakukan bypass interlock atau safety hanya supaya mesin cepat berjalan.<\/p>\n\n\n\n
        Jangan:<\/p>\n\n\n\n
        Safety aktif\n \u2193\n\"Bypass saja supaya produksi jalan.\"\n<\/code><\/pre>\n\n\n\n
        Ini sangat berbahaya.<\/p>\n\n\n\n
        Jika ada safety trip, cari penyebabnya sesuai prosedur keselamatan mesin.<\/p>\n\n\n\n
        \n\n\n\n
        19. Latihan <\/h1>\n\n\n\n
        Saya sarankan dibuat simulator atau panel latihan tegangan rendah<\/strong> terlebih dahulu.<\/p>\n\n\n\n
        Latihan 1<\/h3>\n\n\n\n
        HMI START\n \u2193\nPLC\n \u2193\nOutput RUN\n<\/code><\/pre>\n\n\n\n
        Latihan 2<\/h3>\n\n\n\n
        Tambahkan:<\/p>\n\n\n\n
        HMI SPEED SETTING\n \u2193\nPLC\n \u2193\nAnalog\/network reference\n \u2193\nVFD simulator \/ drive\n<\/code><\/pre>\n\n\n\n
        Latihan 3<\/h3>\n\n\n\n
        Buat monitoring:<\/p>\n\n\n\n
        RUN\nSTOP\nFAULT\nSPEED\nCURRENT\n<\/code><\/pre>\n\n\n\n
        Latihan 4<\/h3>\n\n\n\n
        Buat satu kondisi gangguan dan minta siswa menemukan:<\/p>\n\n\n\n
        \n
        Gangguan berada di HMI, PLC, komunikasi, VFD, atau motor?<\/strong><\/p>\n<\/blockquote>\n\n\n\n
        Ini sangat bagus untuk melatih cara berpikir teknisi.<\/p>\n\n\n\n
        \n\n\n\n
        20. Metode diagnosis harus ditanamkan<\/h1>\n\n\n\n
        Gunakan kalimat:<\/p>\n\n\n\n
        \n
        \u201cJangan menebak komponen rusak. Buktikan titik masalahnya.\u201d<\/strong><\/p>\n<\/blockquote>\n\n\n\n
        Kemudian:<\/p>\n\n\n\n
        1. DENGARKAN KELUHAN OPERATOR\n          \u2193\n2. LIHAT HMI \/ ALARM\n          \u2193\n3. BACA WIRING\n          \u2193\n4. BACA LADDER\n          \u2193\n5. CEK INPUT PLC\n          \u2193\n6. CEK OUTPUT PLC\n          \u2193\n7. CEK COMMAND VFD\n          \u2193\n8. CEK STATUS \/ FAULT VFD\n          \u2193\n9. CEK MOTOR\n          \u2193\n10. CEK MEKANIK\n          \u2193\n11. PERBAIKI\n          \u2193\n12. TEST\n          \u2193\n13. CATAT\n<\/code><\/pre>\n\n\n\n
        Iprosedur dasar troubleshooting<\/strong> yang sangat berguna bagi teknis<\/p>\n\n\n\n
        <\/p>\n","protected":false},"excerpt":{"rendered":"
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