Forward Reverse Star Delta Connection Provide to Learn About forward reverse star delta connection | forward reverse star delta starter power circuit diagram | How to Star Delta Control & Power Wiring Connection | forward reverse star delta power circuit | forward reverse star delta starter power circuit diagram | forward reverse star delta starter control wiring connection diagram | reverse forward star delta power & control diagram | star delta forward reverse diagram | automatic forward reverse motor control wiring circuit with diagram | Dol Starter Connection.
3-Phase Motor Connection Star/Delta (Y-Δ) Starter Reverse-Forward without Timer
In this motor starter, there are four Contactors and switches (Two ON-Push and OFF-Push) are used to change the rotating direction of a three phase motor such as Revers, Forward, Up or Down. As there is no timer used in the control circuit, the operation is semi-automatic or manual.
The power circuit and schematic wiring diagram shows that L1 and L3 have been changed for reverse and forward operation of the three phase motor (as changing two lines out of three will change the rotation of the motor in opposite direction). This kind of motor starting methods through motor starters are needed and used in lathe machines and cranes etc. to change the rotation of motors.
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Working of the Circuit:
If we press the pushbutton for Forward Operation, the motor will start in forward or Up position via K1 Contactor. Likewise, the pushbutton for Reverse operation is used to rotate the motor in Reverse or Down position via K2. Contactor (Where as two lines are changes with respect to the first contactor i.e. K1).
Keep in mind that only one operation (either forward or reverse) is possible at a time due to electrical interlocking i.e. If pushbutton for forward direction is ON, we will have to stop the starter before changing the rotation of the motor. In simple words, both K1 (forward) and K2 (for Reverse) contactors can’t be ON at the same time.
K4 Contactor is in star connection while K3 Contactor is in Delta Connection. They are used as a Star-Delta starter where the motor connects to the main supply in star configuration initially (to reduce the high current) and then in Delta connection with full load speed and voltage.
Related Posts:
Star-Delta (Y-Δ) 3-phase Motor Starting Method by Automatic star-delta starter with Timer.
Three Phase Motor Connection STAR/DELTA Without Timer – Power & Control Diagrams
Abbreviations:
O/L = Over Load Relay (Thermal)
NO = Normally Open Contacts
NC = Normally Closed Contacts
FOR = Forward Position
REV = Reverse Direction
T = Timer
L1, L2, L3 = Three Lines or Phases
K1, K2, K3, K4 = Contactors
Y = Y or Star Connection
Δ = Delta Connection
Power Diagram
Power Diagram of Three Phase Motor Connection for Star/Delta starter without timer to operate the motor in Reverse / Forward directions.
Related Posts:
What is Soft Starter? Its Working, Diagram and Applications
Direct Online Starter – DOL Starter Wiring Diagram for Motors
Control Diagram
Control Diagram of 3-Phase Motor Connection (Star/Delta starter without timer) for Reverse / Forward or Up-down operations.
Schematic Wiring Diagram
Schematic Wiring Diagram of 3-Φ Phase Motor Connection for Reverse and Forward operation using Star/Delta starter without Timer.
Forward Reverse Star Delta Connection Provide to Learn About forward reverse star delta connection | forward reverse star delta starter power circuit diagram | How to Star Delta Control & Power Wiring Connection | forward reverse star delta power circuit | forward reverse star delta starter power circuit diagram | forward reverse star delta starter control wiring connection diagram | reverse forward star delta power & control diagram | star delta forward reverse diagram | automatic forward reverse motor control wiring circuit with diagram | Dol Starter Connection.
3-Phase Motor Connection Star/Delta (Y-Δ) Starter Reverse-Forward without Timer
In this motor starter, there are four Contactors and switches (Two ON-Push and OFF-Push) are used to change the rotating direction of a three phase motor such as Revers, Forward, Up or Down. As there is no timer used in the control circuit, the operation is semi-automatic or manual.
The power circuit and schematic wiring diagram shows that L1 and L3 have been changed for reverse and forward operation of the three phase motor (as changing two lines out of three will change the rotation of the motor in opposite direction). This kind of motor starting methods through motor starters are needed and used in lathe machines and cranes etc. to change the rotation of motors.
Related Posts:
Three Phase Motor Star/Delta Reverse & Forward with Timer
Three Phase Motor Connection Reverse and Forward – Power and Control Wiring diagrams
Working of the Circuit:
If we press the pushbutton for Forward Operation, the motor will start in forward or Up position via K1 Contactor. Likewise, the pushbutton for Reverse operation is used to rotate the motor in Reverse or Down position via K2. Contactor (Where as two lines are changes with respect to the first contactor i.e. K1).
Keep in mind that only one operation (either forward or reverse) is possible at a time due to electrical interlocking i.e. If pushbutton for forward direction is ON, we will have to stop the starter before changing the rotation of the motor. In simple words, both K1 (forward) and K2 (for Reverse) contactors can’t be ON at the same time.
K4 Contactor is in star connection while K3 Contactor is in Delta Connection. They are used as a Star-Delta starter where the motor connects to the main supply in star configuration initially (to reduce the high current) and then in Delta connection with full load speed and voltage.
Related Posts:
Star-Delta (Y-Δ) 3-phase Motor Starting Method by Automatic star-delta starter with Timer.
Three Phase Motor Connection STAR/DELTA Without Timer – Power & Control Diagrams
Abbreviations:
O/L = Over Load Relay (Thermal)
NO = Normally Open Contacts
NC = Normally Closed Contacts
FOR = Forward Position
REV = Reverse Direction
T = Timer
L1, L2, L3 = Three Lines or Phases
K1, K2, K3, K4 = Contactors
Y = Y or Star Connection
Δ = Delta Connection
Power Diagram
Power Diagram of Three Phase Motor Connection for Star/Delta starter without timer to operate the motor in Reverse / Forward directions.
Related Posts:
What is Soft Starter? Its Working, Diagram and Applications
Direct Online Starter – DOL Starter Wiring Diagram for Motors
Control Diagram
Control Diagram of 3-Phase Motor Connection (Star/Delta starter without timer) for Reverse / Forward or Up-down operations.
Schematic Wiring Diagram
Schematic Wiring Diagram of 3-Φ Phase Motor Connection for Reverse and Forward operation using Star/Delta starter without Timer.
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