Zhao Xiaowu (Shanghai You Naites Compressor Co., Ltd., Shanghai 201802) As a commonly used IQlk energy medium, compressed air is widely used in modern industrial manufacturing fields, with a wide range of sources, high compression ratio, and convenient transportation. The air compressor intelligent monitoring energy-saving system is designed for the current situation of the compressed air system in the IQlk. It is a system that can be energy-saving through related software, including monitoring and energy-saving functions. The practice shows that the PLC controller will be used. It is easy to maintain, informative, and highly reliable in the system. Therefore, this paper analyzes and studies the structure, PLC operation and function of the system based on PLC's intelligent monitoring and energy-saving system. Plc; air wit energy system; research 1 PLC-based air compressor intelligent monitoring energy-saving system research and practice necessity Due to the wide application of compressed air in the industrial field, air compressors become essential in the industrial sector flow process The key equipment not only can supply the cooling and cooling equipment with the air of the required pressure, but also can supply the required raw material air to the separation equipment. At the same time, the air compressor is still the energy-consuming equipment and its power consumption. Up to 15% of China's total power generation. With the advent of the global energy crisis, governments around the world are actively promoting energy-saving technologies for their sustainable economic development. Among them, compressed air has received extensive attention. Energy-saving retrofit of air-pressure analysis has become a hot and difficult point in promoting energy-saving technologies. 12 PLC-based air compressor wit control system is based on PLC air compressor intelligent monitoring energy-saving system research and practice, its main advantage is to achieve the system through the automatic control of the air compressor matching the end of the load, in Reducing the idle air supply pressure while maintaining the stability of the pipe network pressure, thus achieving the low impact force of the pressure fluctuation on the production and the host, and can be carried out from the main machine, the auxiliary machine, the pipe network and the end. Azimuth energy saving. 2 PLQ-based air compressor intelligent system structure based on PLC air compressor wit control energy-saving system structure, mainly by the upper industrial computer system, PLC lower position system, current sensor, Pressure Sensor, oscillation sensor W various AC contactors , intermediate electrical appliances, thermal relays and protection circuits. The upper industrial computer system mainly completes the functions of remote parameter monitoring of air compressor, data processing of operation parameters, query setting, etc. It is composed of industrial control computer, printer, UPS, etc.; PLC lower position system adopts PLC controller as the core. The components to realize the system's wisdom 5*, make the PLC field anti-interference ability, and also respond to various harsh conditions. The operating process of the overall system is now described as follows. Firstly, the system realizes the collection of the gas tank pressure information and the motor running current information through the pressure sensor and the current sensor, and converts the collected information into a 420 mA current signal and inputs it into the PLC. Then, the PLC writes a program according to the collected signals, and performs a logical comprehensive judgment on the signal, such as starting when the air pressure of the gas storage tank is lower than the set value, and stopping the motor when the motor is idling and the motor starter is faulty. Finally, the PLC issues start, stop, alarm and other related instructions. Finally, the air compressor is started to load under the air pressure of the air tank below the set value. When the set value of the air tank pressure is reached, the unloading or the motor is stopped due to the air, so that the system can realize the system. run. 3 The application advantages of PLC technology in the system PLC controller is a new type of industrial control device based on microprocessor. Its essence is a dedicated system, and its hardware structure is basically the same as micro calculation m. It is mainly composed of CPU, power supply, communication interface, memory, Fengmo quasi-quantity 1/0+ Mo block, etc. In recent years, it has developed very rapidly in the application and promotion of China, and PLC technology is applied to the air compressor control system. Its related advantages are mainly reflected in the following aspects. D high reliability. All I/O interface circuits in the PLC adopt photoelectric isolation technology to achieve effective isolation between the external circuit from the industrial site and the internal circuit of the PLC; the input end uses an efficient RC filter, and each module is effective. Shielding measures to prevent the interference of the radiation; its power supply, switch performance is excellent, and the device used is strictly screened, the CPU has a good self-diagnosis. In addition, the redundancy of the large PLC to the dual CPU The application of the voting system consisting of a system or a three-CPU makes the reliability of the PLC technology further improved. 2) Application of modular structure. PLC has modular structure design in its CPU, power supply, I/O and other parts, and uses the corresponding rack and cable to organize each module. The required scale and function can be combined according to the needs of users. To adapt to the various needs of industrial control. 3) The operation is simple and easy to maintain. When the PLC is applied, it only needs to connect the relevant equipment on the worksite with the I/O port corresponding to the PLC. The operation and fault indication on each module will help the user to understand the system operation and query the system fault. Due to the modular structure design of the PLC, the user can restore the normal operation of the system by simply replacing the module for the occurrence of the fault. 4 Based on the function of the plcSJ1 intelligent energy system, the research and practice based on the PLC air compressor intelligent system is implemented. The realization of the overall function includes the following aspects. First of all, the system can not only realize automatic collection and display of various operating parameters of the air compressor, but also realize the operation control of the air compressor according to the thief collected by the system; and the bottle can be empty according to the detected information. The working condition of the press is judged. Once the system fails, the corresponding alarm signal will be issued in time, and then the air compressor will stop running according to the type of the fault, so that the system has start, run, alarm and fault. Self-diagnosis, switching and stopping functions. Secondly, the system can collect real-time data such as motor current, IQLk field device switch or fault status through PLC and its related control network, and under the corresponding settings, the system has PLC automatic é¿, avoidance, Various control forms such as ground control. Withdrawal, the system realizes automatic air supply to the air compressor. In the way of automatic PLC control, the system can automatically control the unloading and adding ta line of the air compressor according to the set air supply pressure value. In addition, the system has safe and reliable alarm protection. In the system, each air compressor adopts various related protection measures to fully realize the alarm protection function of the system. The main functional modules of the system design are the following modules: The management function of the group of D air compressors: The system can reasonably control the running quantity of the air compressor according to the situation of the on-site gas, and balance the air pressure. The running time of the machine, therefore, the system not only has the self-learning ability, continuously optimizes the operation mode, but also can detect the tearing pressure, temperature and the running condition of the air compressor in real time, and can also independently control the air pressure. Control, the function of the alarm and record of the abnormal situation of the air pressure. 2) Calculation of gas flow calculation function: The system can monitor the pressure, flow rate and dew point of the compressed air pipe network in real time. When the pressure is abnormal, the alarm function can be realized, and the use of gas can be recorded, stored and Query and other functions. 3) Energy management function of pipeline gas supply: The realization of this function is achieved by installing a pipeline gas supply and energy saving management unit to achieve high-precision control of gas flow, and real-time control of overflow of high-pressure gas, thereby realizing the recording of overflow conditions. , storage, query and report generation. The research and practice of intelligent monitoring and energy-saving system of air compressor based on PLC is an inevitable requirement under the trend of energy-saving energy development. It plays an important role in promoting the sustainable development of HI air, and its prospects for application and application are very broad. Bao Jun, Zhang Heping. Energy-saving scheme for air compressor intelligent monitoring. Automatic and monitoring, 2007. Zhang Xiaoliang. Intelligent control and simulation research of air compressor system. Wuhan University of Science and Technology, 2010. Shi Jinshui, Liu Yuxiang. Design of air compressor monitoring system based on S7-300PLC. Industrial mine automatic Here you can find the related products in Fuel Pump, we are professional manufacturer of Fuel Pump Assembly, Car Fuel Pump,Engine Fuel Pump,Electric Fuel Pump,Auto Fuel Pump.
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