Star-Delta Starter PLC Program and Wiring – Part 1

Overview

This video introduces the Star-Delta Starter, a common method used to start three-phase induction motors while reducing high starting current.

In this method, the motor starts in a star (Y) connection, which reduces the current to about one-third of the normal value, and then switches to a delta (Δ) connection once the motor reaches a certain speed.

The video explains the basic concept, why it is used, and how PLC programming is applied to automatically switch between star and delta

What You Will Learn

• What is a star-delta starter
• Why star-delta is used for motor starting
• Basic working principle (Star → Delta transition)
• Introduction to PLC control for motor starters
• Components involved (contactors, timer, overload)

Applications

• Starting large three-phase motors
• Industrial automation systems
• Pumps, compressors, and fans
• Manufacturing and production lines
• Motor control panels
• Applications requiring reduced starting current