3 Phase Motor Contactor Control Circuit

3 phase direct on line motors consist of three sets of windings one for each phase connected in delta. The control supply for the circuit passes through a control fuse f3. Motor contactor magnetic relay and contactor.

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A simple circuit diagram of contactor with three phase motor.

3 phase motor contactor control circuit. The auxiliary contact is often used in a relay logic circuit or for some other part of the motor control scheme typically switching 120 volt ac power instead of the motor voltage. This is real world 3 phase control circuit wiring. Three phase 480 volt ac power comes in to the three normally open contacts at the top of the contactor via screw terminals. This video gives a brief explanation on how a three phase motor control circuit works.

One contactor may have several auxiliary contacts either normally open or normally closed if required. These motors run on a 400v 3 phase supply and can run using less current than an equivalent single phase motor. In this video i will teach you step by step how make wiring for 3 phase motor control circuit by using magnetic contactor and thermal overload relay. Contactor design and rating contactor nameplate.

Contactor wiring with complete explanation. In 3 power system we use some devices between induction motor and supply which are a cb circuit breaker mc magnetic cont actor or motor stater ol overload relay and nc no push button switches for onoff and reset. How to do contactor wiring for 3 phase induction motor with 3 pole circuit breaker overload relay nonc push button switches in this tutorial post i will tell you about motor contactor wiring and its diagram. Start stop 3 wire control.

A wiring diagram is a simplified conventional. Starting a three phase motor. These motors are connected directly to either a 3 phase switch or a contactor as a method of control. How to wire a contactor and.

Shown here is a contactor for a three phase electric motor installed on a panel as part of an electrical control system at a municipal water treatment plant. The main contactor coil gets the phase line l1 through the control circuit only when all the contacts are closed. Contactor for a three phase electric motor installed on a panel as part of an electrical control system. In this case when the start pushbutton is pressed the control circuit is closed and the main contactor is energized.

Examine this three phase motor control circuit where fuses protect against overcurrent and a three pole relay called a contactor turns power on and off to the motor. After years of faithful service one day this motor refuses to start.