Star-Delta Starter PLC Program and Wiring – Part 3

Overview

This video continues the Star-Delta Starter PLC Program and Wiring series, focusing on the complete wiring and working principle of the system.

It explains how the motor windings are connected in star configuration during startup to reduce current, and then switched to delta configuration for full operation.

The video also highlights how PLC outputs control the main, star, and delta contactors, ensuring a safe and automatic transition between both modes.

This part helps in understanding the full system operation, combining wiring, control logic, and motor behavior in real industrial applications.

What You Will Learn

• Complete working principle of star-delta starter
• How motor windings are connected (Star vs Delta)
• Role of PLC in controlling contactors
• Sequence of operation (Start → Star → Delta)
• Importance of timing and safe switching

Applications

• Industrial motor control systems
• Large three-phase motors (pumps, compressors, fans)
• Manufacturing and production lines
• Electrical control panels
• Automation systems requiring reduced starting current
• Motor protection and efficient startup systems