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We have the input commands to these Push Button switches which are then internally processed by PLC and then there is the output terminal which activates the corresponding relay to energize the relevant magnetic contactors.Only Push Button switches are used to control the direction of this three-phase AC motor.Two magnetic contactors are used, one for forward connections and the other for reverse connections.Contactor is an electrical switch used for switching an electrical power circuit.As here we have a three-phase AC motor, reversing any two leads will drive the motor in reverse direction.In fact, these are not even available widely with reversing capability. Single-phase motors are not widely used for reversing operation.DPDT switch is best suitable for reversing a small DC motors while Reversing Contactor is used to reverse Three-Phase AC motors.One is to use DPDT (Double Poles, Double Throw) switch and another one is by using Reversing Contactors. There are certain ways to reverse the motor.And for DC motor, reversing the field leads with respect to the armature leads. For single-phase motor, reversing start lead with respect to the main leads. For any three-phase AC motor, reversing can be accomplished by reversing any two leads.
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