Interlock contacts are also strategically placed on the control circuit as a protective measure.
Another interrupting contact is the thermal overload contact (purple) which serves as an automatic shutoff switch that instantaneously opens the control circuit to shut down the motor when overload current greater than the rated capacity is detected from the electric motor. To manually interrupt the circuit, the operator only needs to press the stop push button switch to deactivate any energized coil in the control circuit to instantaneously isolate the power source to the motor. This final stage places the motor terminal in the power circuit configured to a delta connection.Īnother forward main contact (blue) is connected in parallel across the forward push button switch to serve as a latching switch that keeps the forward main coil maintained energized after the operator releases the forward push button switch.Ĭonversely, when the reverse push button switch is pressed by the operator, all the related contacts of the reverse main coil (red) is activated which holds the reverse main coil maintained activated after releasing the reverse push button switch, then energizes the star coil (brown) and the timer coil (green), then switches to the reverse delta mode (orange) after the specified time set on the timer expires. 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. 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.
#CONTROL CIRCUIT FOR FORWARD AND REVERSE MOTOR FULL#
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. Electrical Wiring Diagram Forward Reverse Motor Control And Power Circuit Using Mitsubishi Plc Technovation Technological Innovation And Advanced Industrial Control Technologies Forward Reverse Starter Diagram Engineering Portal Forward Reverse Motor Control And Power Electrical Mechanical Info Facebook Index 5 Relay Control Control Circuit Circuit Diagram Seekic Com
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