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This means that the contactors also required the neutral wire. Here I had shown that both contactors are 220 VAC. Here I have shown the forward reverse motor control diagram for 3 phase motor. The 元 is connected to the T3 terminal in the first contactor and in the 2nd contactor in the T1 terminal.Īfter that, the three phase supply goes to thermal overload relay and from thermal overload relay, the soppy goes to the 3 phase motor connection plate and provided to 3 phase motor. The L2 is connected is both contactors in the same terminals (T2). Where L1 is connected to the T1 terminal and connected on the T3 terminal in 2nd magnetic contactor. And 元 wire connected to both 'contactors' 3rd terminal.īut the out connection is different. L2 wire connected to the both 'contactors' 2nd terminal. Here the L1 is connecting to both contactors' first terminal. And from the MCCB breaker, I connect the supply to both 'magnetic contactors'. In the diagram, I connect the incoming three phase supply L1, L2, 元 to the MCCB circuit breaker (molded case circuit breaker). Here I showed the forward reverse wiring diagram. We use 2 'magnetic contactors' as forward reverse switch. In short this the complete guide of forward reverse starter wiring and installation.įorward Reverse Motor Control Diagram for Three Phase Motorįor a three-phase motor forward reverse control circuit. I showed the 3 poles MCCB circuit breaker, 2 magnetic contactors, normally open, normally close push button switch, thermal overload relay, 3 phase 4 wire system supply, 3 phase motor with connection, trip indicator light, etc. In the 3 phase motor forward reverse starter wiring diagram. In this post, you will complete learning about the forward reverse three phase motor controlling starter diagram. This post is about the controlling and wiring diagram of 3 phase motor forward reverse motor starter. Normally open contacts provide plugging while normally closed contacts provide anti-plugging.Forward reverse motor control diagram. The switch assembly is usually connected directly to the shaft of the motor or the driven equipment so that when the motor spins in a particular direction, the contacts change their state (normally closed contacts open, and normally open contacts close). If the sudden reversal of a motor is considered undesirable, then our control circuit can be designed to provide anti-plugging, which can be provided by either a normally closed zero-speed switch or off-delay timer relays.Īs a general rule, the control scheme for plugging includes a reversing magnetic starter and a rotary-motion switch called a zero-speed switch. We will be examining a plugging circuit in greater detail further in this text. For example, in certain machine-tool operations where instantly stopping motor drives may be necessary. Some circuits use this plugging action to quickly decelerate and stop a motor. If a motor is expected to make sudden reversals of direction, then the motor starters should be increased in size and horsepower rating to accommodate for this more severe operation. Plugging also causes excess heating of the conductors that make up the coils inside the motor, as well as the power contacts of the motor starter. Plugging is hard on motors, and if they are directly attached to high inertia loads, the shaft of the motor can shatter. If, for example, a motor is spinning in the forward direction and is stopped and suddenly reenergized in the reverse direction before the shaft of the motor has time to come to a complete stop, the motor will be said to have been “plugged.”
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When a three-phase motor is first energized, it experiences an inrush current and harsh starting torque.
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Anti-PluggingĬlick play on the following audio player to listen along as you read this section.