Star Delta Dole Starter Power Wiring, Control Wiring, and Motor Wiring

Introduction

In this blog, we will discuss the power wiring, control wiring, and motor wiring of a star delta dole starter. We will go through the diagram step by step and explain the components used in the diagram. By the end of this blog, you will have a clear understanding of how to connect the star delta dole starter for your motor.

The Components

Before we start with the wiring, let's understand the components used in the diagram:

• 440 volts power source
• Line one, line two, line three, and neutral wires
• Main contactor
• Thermal overload relay
• Delta contractor
• Star contractor
• Start switch
• Stop switch
• Timer
• MCB (Miniature Circuit Breaker)
• ELCB (Earth Leakage Circuit Breaker)

Power Wiring

In the power wiring, we connect the 440 volts power source to the subsequent ELCB. The line one, line two, line three, and neutral wires are connected to the ELCB's input. From the ELCB's output, the line one, line two, and line three wires are connected to the thermal overload relay's input. Finally, the thermal overload relay's output is connected to the main contactor's input.

Control Wiring

The control wiring involves connecting various components to control the motor. Here's how it is done:

• ALCB output line one is connected to the MCB's input.
• The MCB's output is connected to the thermal overload relay's NC (normally closed) point.
• The thermal overload relay's NC point is connected to the start switch's number three pole and the stop switch's number one pole.
• The stop switch's number two pole is connected to the main contactor's NC point.
• The start switch's number four pole is connected to the main contactor's coil A1.
• The timer's number seven pole is connected to the start switch's number four pole and the timer's number eight pole is connected to the star contractor's coil A1.
• The timer's number five pole is connected to the star contractor's coil A2.
• The timer's number six pole is connected to the delta contractor's coil A1.
• The delta contractor's coil A2 is connected to the neutral wire.

Motor Wiring

The motor wiring is the final step in the connection process. Here's how it is done:

• The main contactor's output T1 is connected to the motor's U1 terminal.
• The delta contractor's output T1 is connected to the motor's U2 terminal.
• The main contactor's output T2 is connected to the motor's V1 terminal.
• The delta contractor's output T2 is connected to the motor's V2 terminal.
• The main contactor's output T3 is connected to the motor's W1 terminal.
• The delta contractor's output T3 is connected to the motor's W2 terminal.

Conclusion

By following the above power wiring, control wiring, and motor wiring steps, you can successfully connect a star delta dole starter for your motor. It is important to ensure the correct phase connections and proper wiring to avoid any short circuits or motor malfunctions. If you need a visual guide, you can check out our practical video on this topic. You can also download the diagram from our website for easy reference. We hope this blog has been helpful to you. If you have any further questions, feel free to reach out to us. Stay safe and happy wiring!