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Membuat rangkaian motor listrik starting DOL ( direct on line )

Admin

2 Feb, 2023

Bermacam macam cara untuk menjalankan ( starting) motor listrik. Salah satu yang paling sederhana adalah sistem starting DOL ( direct on line ). Sistem ini biasanya diterapkan pada motor listrik dengan kapasitas dibawah 5 HP.. Skema rangkaian bisa dilihat pada gambar dibawah ini :

Pada skema starting DOL ini terdapat 2 blok rangkaian. Gambar 1 ( A ) adalah skema rangkaian daya. Sedangkan gambar 1 ( B ) merupakan skema kontrol.

Q1 = MCB untuk daya

Q2. = MCB untuk kontrol

KM1 = Kontak utama kontaktor KM1

F1 = Thermal Overload

S1. = Push Button NC

S2. = Push Button NO

M1. = Motor Listrik

Adapun prinsip kerjanya sebagai nerikut :

Pada saat rangkaian di beri tegangan , Q1 Q2 posisi 'ON" kemudian Push button S2 ditekan, maka arus akan mengalir ke coil KM1 melalui kontak NC F1. Bersamaan itu arus juga mengalir melalui kontak bantu KM1. Sehingga bila Push Button S1 dilepas, Kontaktor KM1 tetap bekerja.

Dan apabila motor mengalami Overload ( gambar 3 ) maka Thermal Overload F1 akan bekerja dan mematikan kontaktor KM1.

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