The Design of Liquid Level Control of Frequency Converter Based on PLC

Due to the powerful functions and high reliability of PLC, it is often used as field data acquisition and equipment control. Inverter technology is a comprehensive technology, which is based on control technology, electronic power technology, microelectronic technology and computer technology. Compared with the traditional AC drive system, it uses the frequency converter to control the speed of the AC motor, which can realize the high-efficiency continuous speed control in a large range and realize the precise control of the speed. PLC features: First, high reliability and strong anti-interference ability. And PLC adopts many hardware and software anti-interference measures. Second, the programming is simple and easy to use. At present, most PLCs use the ladder diagram programming method in the form of relay control, which is easily accepted by operators. Some PLCs have also designed steps such as step ladder instructions according to specific problems, which further simplifies programming. Third, the design and installation are easy and the maintenance workload is less. Fourth, it is suitable for harsh industrial environments, and the packaging method is suitable for various vibration, corrosion, toxic gas and other applications. Fifth, it is convenient to connect with external equipment, and the removable terminal block adopts a unified wiring method, which provides different terminal functions and is suitable for a variety of electrical specifications. Sixth, it has perfect functions, strong versatility, small size, low energy consumption, and high performance-price ratio. In the application of PLC system design, the following basic principles should be followed to ensure the stability of the system. (1) Meet the control requirements of the controlled object to the greatest extent; (2) The system structure should be simple; (3) The system work should be stable and reliable; (4) The control system can be easily expanded and upgraded; (5) People The machine interface is friendly. In order to realize the full utilization of energy and the needs of production, it is necessary to adjust the speed of the motor. The system uses the design of PLC software to realize the parameter setting of the inverter, fault diagnosis and the start and stop of the motor. Control requirements: 1) The system requires the user to intuitively understand the working state of the field equipment and the change of the water level; 2) The user is required to be able to remotely control the start and stop of the inverter; 3) The user can set the water level by himself to control the inverter 4) The fault information of the inverter and other equipment can be reflected on the remote PLC in time; 5) It has the function of alarming and prompting the user when the water level is too high or too low; Control structure: when only one motor is used as the controlled object A single PLC can be used to control a single object, as long as a high-performance PLC is properly selected, it is fully capable of this function. PLC collects the information of various objects related to sensors, monitoring motors and frequency converters. A frequency converter is used to adjust and control the frequency of the motor. The analog signal output by the PLC is used as the input signal of the control end of the inverter, so as to control the speed of the motor, and feedback its own working status signal to the PLC. When a fault occurs, it can send an alarm signal to the PLC. Since the variable frequency speed regulation is realized by changing the power supply frequency of the motor stator to change the synchronous speed, the limited slip power can be maintained from high speed to low speed during the speed regulation process, so it has high efficiency, wide range and high precision. Speed ​​regulation performance. Selection of equipment At present, there are a wide variety of large, medium and small PLC modules to choose from, and the expansion includes communication mode, storage mode, I/O module and so on.
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