Application of Temperature Control Based on PLC in Electroplating Production Line for Electric Heating Tube Electroplating

Application of Temperature Control Based on PLC in Electroplating Production Line for Electric Heating Tube Electroplating

Temperature control systems are widely used in various fields of industrial control, and the quality of control methods and operational performance of temperature control systems directly affect product quality, operational efficiency, and so on. With the rapid development of science and technology, programmable logic controllers (PLCs), as one of the three pillars of industrial production automation, have been effectively applied in temperature control systems, providing safe, reliable, and relatively complete solutions for temperature control systems. In electroplating production, special tanks such as degreasing tanks and chrome plating tanks have specific temperature requirements. This article mainly introduces the FX0NPLC controlled electroplating temperature control system. The system, composed of PLC as the core, can easily use software to set and adjust parameters. It utilizes analog functional modules and functional instructions to achieve signal acquisition, A/D conversion, and processing with the cooperation of peripheral circuits.

2. Design of Electroplating Temperature Control System

The diagram of the electroplating temperature control system is shown in Figure 1, where the temperature tank is a special tank such as an oil removal tank and a chrome plating tank.

I/O allocation:

X0: Start control

Y0: Fault display Y1: Electric heater

The principle of electroplating temperature control is: first, the temperature change is converted into a voltage signal through a temperature measurement circuit, and then the voltage signal is input into the PLC analog channel. The PLC reads the analog quantity through instructions and converts it into a digital quantity. Then, the input quantity is compared with the program given value through comparison instructions, and corresponding operations are made. If the input quantity is less than the given value, it indicates that the actual temperature is less than the required temperature. The PLC will connect the heating contactor and start heating; If the input value is greater than the given value, it indicates that the actual temperature is greater than the required temperature. The PLC will disconnect the heating contactor and stop heating. The temperature inside the electroplating tank is controlled by the thermal resistance wire inside the tank, and the regulation of the electroplating temperature is the control of the power on and off of the thermal resistance wire. To heat up and energize the thermal resistance wire; To cool down, turn off the thermal resistance wire. The power outage of the thermal resistance wire is controlled by the heating contactor.

www.superbheater.com