Oleh : Ir SUWARNO RAWAN
PEMELIHARAAN MOTOR LISTRIK
KUNCI KOMPETENSI TEKNIK• Penerapan aturan (k-3,gambar teknik,dll)
• Persiapan kerja( tools,material,alat lainnya
• Pelaksanaan pekerjaan( (bongkar,periksa,perbaiki,teliti,asembly,uji)
• Laporan( hasil pemeliharaan,hasil uji,riwayat perbaikan)
KONVERSI ENERGY
• Motor,adalh perubah energy listrik menjadi energy gerak/putar
• Banyak digunakan di pembangkit-pembangkit(pltu,pltg,pltgu)
• Pltu/pltgu,motor sbg. Penggerak pompa,fan,compresor,crane,pemadam
• Daya terbesar, 5 mw pompa pengisi air boiler.
JENIS ,MOTOR
• Motor dc, sebg prl.emergency(pltu/pltgu)
• Motor ac,1 fasa dan 3fasa
• 1 fasa,banyak digunakan rumah tangga
• 3 fasa , banyak di industri (pltu,pltgu)
KONSTRUKSI MOTOR
• Statik, rangka stator ,belitan
• Rotating, rotor.
• Belitan motor 3 fasa = 3belitan
• Belitan utama motor 1 fasa = 1 blt+bantu
• Blt stator 3 fs = bintang, segitiga
• Pendingin motor =
- Udara
- Air/pompa air renda
PROSEDUR PERBAIKAN MOTOR
• Sebelum dimatikan
• Tes arus , berbeban/tdk berbeban
>tes arus nominal masing fasa
Motor stop,koordinasi operator
Safety, bebaskan tegangan, katub2
pasang tagging
buka tutup terminal,tes teg.
TAHAP PEMBONGKARAN
• Lepas kabel suply power
• Beri tanda antar fasa (3 fs)
• Beri isolasi ujung kabel terbuka
• Lakukan pengukuran
Belitan body
Fasa to fasa
Fasa to neutral
SISI MEKANIK
• Lepas baut kopling pompa
• Tes uji alignment(kesebarisan)
• Lepas baut dudukan
• Lepas baut breaket
• lepas bearing( panaskan, tracker)
• Penataan komponen motor.
TAHAP PEMERIKSAAN
• Bersihkan semua komponen
• Periksa kondisi komponen
• Periksa bearing
• Ukur tahanan isolasi belitan
> bandingkan dng refferensi (pabrik,data awal)
TINDAKAN PERBAIKAN
• Jika hasil pengukuran turun dbw
standar.
Bersihkan belitan gunakan cairan khusus
Lapisi belitan gunakan insulation vernish.
Keringkan dgn heater
METODA PENGERINGAN MOTOR BESAR
• Lakukan dgn hati-hati
• Gunakan heater yang dpt diatur suhunya
• Lakukan pelan2 sampai suhu 90°c
• Pertahankan suhu 90 °c konstan
• Selama pengeringan ukur thn setiap selang waktu
• Matikan dan biarkan dingin alami
PENGGANTIAN BEARING
• Check vibrasi, nois/ saat operasi
• Lepas bearing panasi / tracker
• Check visual/ motor stop
Karat
Cacat
Kotor
Outer/innering
GANTI BEARING BARU
>Siapkan bearing dengan spesifikasi benar
Siapkan tolls, pemanas
Pemasangan yang benar/ nomer seri spec pada posisi terbaca
UJI KELAIKAN OPERASI
• Setelah komponen motor diassembly
lakukan persiapan uji mekanik
Siapkan tools, alat ukur presisi
( micrometer, dial indicator, magnetic standar, seam plate, cermin )
Bersihkan dudukan baut motor
Lakukan uji alignment (penyebarisan)
Dapatkan angka alignment standar
Lakukan uji individu/ tes putaran
UJI RUNING
• Lakukan tes inchang.
• Jika hasil baik, koordinasikan operator
• Lakukan tes operasi
Check vibrasi
Check nois
Check temperatur
Finish ………………….. Penyusunan laporan.
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