Have you ever wondered how to start and configure a PLC simulator? Or how to test the logic of a PLC program? In this guide, we will walk you through the process step by step, using the Star-Delta Starter PLC program as an example.
Contents
Introduction
Starting a motor can cause a sudden surge of current, known as inrush current. To mitigate this, the Star-Delta concept of wiring and programming is often used. This not only reduces the stress on the motor but also ensures a smooth and controlled start. In this guide, we will explore the intricacies of the Star-Delta wiring and programming approach, providing you with the knowledge you need to implement it effectively.
Going Online and Testing the Logic
Once you have downloaded the PLC software and configured the simulator, it’s time to test the logic of the program. By clicking on the “monitor on/off” icon in the toolbar, you can switch to the online mode and connect to the simulator. The green lines indicate where the signals are true.
Understanding the Normally Closed Switch
In the Star-Delta program, a normally closed switch is used. This means that when the switch is closed, the signal passes through. In the online mode, the switch should already be closed, allowing the 24-volt signal to reach the connected PLC input. However, when testing the program with the simulator, the input may appear false. To simulate the normally closed switch, you can simply make the input in the simulator true.
Testing the Program
Now that everything is set up, it’s time to test the PLC program. When the start switch is pressed, the main and star contactors should be energized simultaneously. After an 8-second delay, the star contactor should be de-energized, while the delta contactor is energized. Throughout this process, the main contactor remains energized.
The Result: Program Success
By pressing the start switch, you can observe the expected behavior of the program. The main and star contactors are energized, and the timer starts timing. After 8 seconds, the star contactor is de-energized, while the delta contactor is energized. The main contactor remains active, resulting in both the main and delta contactors being active.
FAQs
Q: Can I use a normally open switch instead of a normally closed switch?
A: No, the Star-Delta program is specifically designed to work with a normally closed switch. Using a normally open switch will result in incorrect behavior.
Q: Do I need a PLC simulator to test the program?
A: While a simulator is helpful for testing and learning purposes, you can also test the program directly with a PLC and actual switches.
Q: How can I learn more about PLC programming?
A: For comprehensive training material on PLC programming, visit Techal. Their highly effective training series will equip you with the knowledge you need to excel in the field of Automation and Controls Engineering.
Conclusion
The Star-Delta concept of wiring and programming is a valuable approach to alleviate the inrush current when starting a motor. In this guide, we have provided you with a comprehensive understanding of the Star-Delta Starter PLC program and wiring. By following the steps outlined in this guide, you can confidently implement this approach and ensure a smooth and controlled start for your motors.
We hope you found this guide informative and enjoyable. If you have any further questions or would like to explore more training material on PLC programming, please visit Techal. Program on!
