control circuit for forward and reverse motor

After an elapsed time is reached, the timer contact (green) will release the star coil (brown) and transfers the command to the forward delta mode as a result of a completed circuit with the closing of the timer contact (green) along with the awaiting initially closed forward main contact (blue), thereby permitting power flow to the forward delta coil (dark blue).

The forward main contact (blue) closes to activate the star coil (brown) together with the timer coil (green), hence placing the motor terminal in the power circuit connected to a star configuration. The relevant auxiliary contacts of the forward main coil (blue) would then be actuated opposite its normal state, that is, a normally open contact would eventually switch to a close contact whereas a normally close contact would switch to an open contact. When the forward push button switch is selected, the command is transferred to the relevant forward function of the circuit which activates the forward main coil (blue).

Depending on the choice of the operator, starting the circuit is selected via the forward or the reverse push button switches. A star-delta motor starts in two stages, controlled by equipment connected to it.įorwarding and reversing of an ac motor is done using a push button switches. Three phase star-delta motors are used for maximum talk, where the motor will try to start under a heavy load. Three phase star-delta motors are constructed similarly to a direct online single phase motor, but the terminals for each winding are not terminated within the motor, instead they are brought out of the motor for control wiring to connect to. REVIEW OF DIFFERENT TYPES AC MOTOR CONTROL.HISTORICAL BACKGROUND OF AN AC INDUCTION MOTOR.REVIEW OF OPERATING PRINCIPLES OF AN AC INDUCTION MOTOR.This work deals with forward reverse of an ac motor delta used in every electrical industry involving industrial process automation control technology. This addition gives the relay the property of time-delay actuation. In this work, instead of changing the direction of the motor manually a timer relay was used which is a type of relay constructed with a kind of “shock absorber” mechanism attached to the armature which prevents immediate, full motion when the coil is either energized or de-energized. Since the motor is connected to the power line regardless of which direction it operates. Manually, the direction of rotation of any three-phase motor can be reversed by changing any of the motor leads.

Control circuit for forward and reverse motor