Reverse Forward Star Delta Control Wiring
Reverse and Forward Star / Delta (Y-Δ) Starter for Three Phase Motor using Timer Three-phase induction motors are widely used in industrial applications due to their efficiency and robustness. To control the direction of rotation and reduce the starting current, various starting methods are employed. One such method is the “Reverse Forward Star Delta Starter,” a popular choice for controlling three-phase induction motors.
As we have previously discussed the starting method of a Three Phase Motor using the Star Delta Starter with a timer, including power, control, and wiring circuit diagrams.
In today’s post, we will illustrate how to automatically control the motor’s rotation in two directions, namely forward and reverse, using the Star Delta Starter and timer. The timer circuit is responsible for controlling the direction of rotation of this three-phase motor, transitioning it from FWD to REV and from Star to Delta configuration.
Components Needed 3-Phase Motor MCCB – 3-P, 400V MCB – 2-P, 100-230V Contactors Timer ON OFF Push Button Indicators and Pilot Lights 230V Single Phase AC Supply 400V – Three Phase AC Supply Wires and Cables Control Circuit The control The circuit consists of various relays, timers,, pushbutton, indicators and contactors that provide the logic and switching required for the starter's operation. It ensures that the star-delta and REV/FWD switching occurs correctly and provides additional protection features.
In the above wiring and control diagram: 3-P MCCB is used to protect the combination of star delta and reverse/forward starter circuit from overload and short-circuit.
2-P MCB is used to protect the control circuit.
The main contactor “K1” is used to operate the motor in normal i.e. forward direction.
The contactor “K2” is used to runs the motor in reverse direction.
The contactor “K3” is used to operate the motor in star connection.
The contactor “K4” is used to run the motor at full load voltage in delta configuration.
The timer is responsible for transferring the motor connection from star to delta after reaching the preset value.
The “O/L” is used to protect the motor from thermal overload protection.
The pushbuttons are used to ON/OFF or operate the motor in REV or FWD directions. The indicators lights are used to indicate the Trip (overload), FWD, REV or Stop position of the motor.
Working Principle The Reverse Forward Star Delta Starter is designed to control the direction of rotation of a three-phase motor by first starting it in a reduced voltage configuration and then switching to the full voltage configuration for normal operation. The starting process involves two stages: the star configuration and the delta configuration.
Star Configuration During the initial starting phase, the motor is connected in a star configuration. In a star configuration, the motor windings are connected in such a way that each winding’s starting end is connected to the ending end of another winding.
The other end of each winding is connected to a common point, forming a star-like shape. By doing so, the voltage applied to each winding is reduced to approximately 1/√3 times the line voltage, significantly reducing the starting current and preventing excessive torque on the motor shaft.
Delta Configuration After the motor reaches a certain speed, the control system switches the motor’s connection from star to delta. In the delta configuration, the motor windings are rearranged in a closed-loop or delta shape.
Reverse Forward Star Delta Control Wiring
Reverse and Forward Star / Delta (Y-Δ) Starter for Three Phase Motor using Timer Three-phase induction motors are widely used in industrial applications due to their efficiency and robustness. To control the direction of rotation and reduce the starting current, various starting methods are employed. One such method is the “Reverse Forward Star Delta Starter,” a popular choice for controlling three-phase induction motors.
As we have previously discussed the starting method of a Three Phase Motor using the Star Delta Starter with a timer, including power, control, and wiring circuit diagrams.
In today’s post, we will illustrate how to automatically control the motor’s rotation in two directions, namely forward and reverse, using the Star Delta Starter and timer. The timer circuit is responsible for controlling the direction of rotation of this three-phase motor, transitioning it from FWD to REV and from Star to Delta configuration.
Components Needed 3-Phase Motor MCCB – 3-P, 400V MCB – 2-P, 100-230V Contactors Timer ON OFF Push Button Indicators and Pilot Lights 230V Single Phase AC Supply 400V – Three Phase AC Supply Wires and Cables Control Circuit The control The circuit consists of various relays, timers,, pushbutton, indicators and contactors that provide the logic and switching required for the starter's operation. It ensures that the star-delta and REV/FWD switching occurs correctly and provides additional protection features.
In the above wiring and control diagram: 3-P MCCB is used to protect the combination of star delta and reverse/forward starter circuit from overload and short-circuit.
2-P MCB is used to protect the control circuit.
The main contactor “K1” is used to operate the motor in normal i.e. forward direction.
The contactor “K2” is used to runs the motor in reverse direction.
The contactor “K3” is used to operate the motor in star connection.
The contactor “K4” is used to run the motor at full load voltage in delta configuration.
The timer is responsible for transferring the motor connection from star to delta after reaching the preset value.
The “O/L” is used to protect the motor from thermal overload protection.
The pushbuttons are used to ON/OFF or operate the motor in REV or FWD directions. The indicators lights are used to indicate the Trip (overload), FWD, REV or Stop position of the motor.
Working Principle The Reverse Forward Star Delta Starter is designed to control the direction of rotation of a three-phase motor by first starting it in a reduced voltage configuration and then switching to the full voltage configuration for normal operation. The starting process involves two stages: the star configuration and the delta configuration.
Star Configuration During the initial starting phase, the motor is connected in a star configuration. In a star configuration, the motor windings are connected in such a way that each winding’s starting end is connected to the ending end of another winding.
The other end of each winding is connected to a common point, forming a star-like shape. By doing so, the voltage applied to each winding is reduced to approximately 1/√3 times the line voltage, significantly reducing the starting current and preventing excessive torque on the motor shaft.
Delta Configuration After the motor reaches a certain speed, the control system switches the motor’s connection from star to delta. In the delta configuration, the motor windings are rearranged in a closed-loop or delta shape.
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