How to Wire a Three-Phase Thyristor Power Controller with DC Signal?

In addition to using 4-20mA output from temperature controllers, SCR power controllers can also be operated with DC voltage input signals to regulate heating power. This method is commonly used and provides an easy and efficient way to manage heating applications. In this article, we will explore the wiring process for SCR controllers when using a DC voltage input signal.

1. Main Circuit Wiring

The main power supply to the heater is connected through the SCR controller. For a three-phase system, connect the power cables to the large terminal on the top of the SCR controller. Then, connect the output terminals on the bottom to the heating elements.

2. Control Signal Wiring

In this setup, the control signal used is a DC voltage input, typically either 0-5V or 0-10V. To connect this to the SCR controller, connect the positive terminal of the voltage signal to Terminal 3 and the negative terminal to Terminal 4. This will allow the SCR controller to receive the control voltage that dictates the power output to the heater.

3. Power Supply to the SCR Controller

To power the SCR power controller, use a 220V AC supply. Connect the live wire to Terminal 20 and the neutral wire to Terminal 21. This will provide the necessary power for the SCR controller to operate.

4. Program Settings

1. Set Input Signal Selection
   Refer to Operation Interface instructions to set the value of A02 (Input Signal Selection) to AI2 (Analog Input 2), which allows the SCR controller to recognize the DC voltage input signal.
2. Configure Voltage Input Type
   Depending on whether you are using a 0-5V or 0-10V input signal, you will need to adjust the settings for A06 (Voltage Input Analog Type).
   • For a 0-5V input signal, set A06 to 0.
   • For a 0-10V input signal, set A06 to 1.
   These settings ensure the SCR controller can interpret the voltage signal accurately and adjust the heating power accordingly.

This setup allows you to efficiently control the heating power using a DC voltage input, offering precise and reliable control over your heating process. If you need assistance with configuration or have any questions, feel free to contact us.