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Sabtu, 13 November 2010

Pemeliharaan motor listrik

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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