Schematic Wiring Diagram of 3-Φ Phase Motor Connection for Reverse and Forward operation using Star/Delta starter without Timer.
Direct Online Starter – DOL Starter Wiring Diagram for MotorsĬontrol Diagram of 3-Phase Motor Connection (Star/Delta starter without timer) for Reverse / Forward or Up-down operations. What is Soft Starter? Its Working, Diagram and Applications. Power Diagram of Three Phase Motor Connection for Star/Delta starter without timer to operate the motor in Reverse / Forward directions. Three Phase Motor Connection STAR/DELTA Without Timer – Power & Control Diagrams. Star-Delta (Y-Δ) 3-phase Motor Starting Method by Automatic star-delta starter with Timer. They are used as a Star-Delta starter where the motor connects to the main supply in star configuration initially (to reduce the high stating current) and then in Delta connection with full load speed and voltage. K4 Contactor is in star connection while K3 Contactor is in Delta Connection. They can also be used with other circuits such as lighting and electric heat circuits, but do not provide overload protection. In simple words, both K1 (for Forward) and K2 (for Reverse) contactors can’t be ON at the same time. Use these switches to control the on/off function of motors that run forward and backward, such as motors for conveyor belts. 
if pushbutton for Forward direction is ON, we will have to stop the starter before changing the rotation of the motor.
Keep in mind that only one operation (either forward or reverse) is possible at a time due to electrical interlocking i.e. Contactor (Where as two lines are changes with respect to the first contactor i.e. Similarly, the pushbutton for Reverse operation is used to rotate the motor in Reverse or Down position via K2. 
If we press the pushbutton for Forward Operation, the motor will start in forward or Up position via K1 Contactor.
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