Water pump is one of the key equipments which must be used in modern industry and agriculture. The research on water pump is also an important subject in the modernization research of our country. Pump performance testing is one of the key areas.
There are two types of pump testing systems in China: one is a test system made up of single board computer and many discrete components developed in the 1980s, and the other is a smart test instrument or standardized instrument since 1990s. And computer systems. The former degree of automation is not high, most have been eliminated, the latter due to higher cost, the majority of factory school can not accept. To this end, we put forward based on S7-300PLC pump test system, the system adaptability, easy operation, powerful.
The test system to the provisions of the national standard B-level accuracy for the design standards. Its main functions are: the pump outside the characteristics of the test and pump characteristics of the test, the corresponding external characteristics include the prototype pump and model pump energy test, cavitation test, vibration and noise testing.
The relevant physical parameters are measured by the corresponding equipment. Flow measurement using electromagnetic flowmeter and flow rate meter to achieve. The head is measured by pressure transmitter, atmospheric pressure transmitter, liquid level transmitter. A pressure calibrator is used to calibrate the pressure gauge. Power measurement using torque and power measurement dynamometer. Can be achieved through intelligent torque sensors, signal conversion cabinet, torque and speed measuring instrument, speed transmitter, temperature sensor, DC digital voltage ammeter, three electrical parameters measuring instrument to achieve. The calibration of the electrical parameter instrument is made by AC / DC calibration meter. Vibration and noise measurements were used vibration meter and noise meter, the motor temperature measurement using three-pass measurement of temperature rise instrument. The choice of specific models should be selected according to the actual situation to meet the corresponding parameters calculated to meet the accuracy requirements.
According to the actual needs of the system, taking into account the relevance of their equipment and the actual working conditions, the system decided to adopt a distributed structure and RS485 / PROFIBUS bus. Measurement and control system set up two sets of computer monitoring and data processing computer, the need to set the projection screen and multimedia presentations. Two sets of industrial computer are used to control different test stations respectively. The control of the test is concentrated in the central control room. Test parameter adjustment through the electric control valve and Siemens MM440 inverter to achieve regulation. At the same time show the operation of the system, including the direction of flow of water, control valve opening and closing, the system is running normally, and large-screen display of the pump operating point of the relevant parameters to facilitate on-site regulation. Data acquisition and processing through the sensor and the secondary instrument connected with the data acquisition computer, data acquisition all automated, automatic acquisition, automatic processing and print output. System main control equipment by the Siemens CPU315-2DP + digital / analog acquisition module. The upper data acquisition system uses the Siemens WinCC software.
The system can accurately collect a variety of test data, and can control the pump running through the inverter at a variety of different operating frequencies, so that the pump test more comprehensive.
The system has been successfully used in a well-known domestic military design institute of the pump test system, stable and reliable, to achieve the automation of pump testing. The communication program can also be used in the PLC and other equipment in the communication process, similar to the application of the project has a certain reference.
There are two types of pump testing systems in China: one is a test system made up of single board computer and many discrete components developed in the 1980s, and the other is a smart test instrument or standardized instrument since 1990s. And computer systems. The former degree of automation is not high, most have been eliminated, the latter due to higher cost, the majority of factory school can not accept. To this end, we put forward based on S7-300PLC pump test system, the system adaptability, easy operation, powerful.
The test system to the provisions of the national standard B-level accuracy for the design standards. Its main functions are: the pump outside the characteristics of the test and pump characteristics of the test, the corresponding external characteristics include the prototype pump and model pump energy test, cavitation test, vibration and noise testing.
The relevant physical parameters are measured by the corresponding equipment. Flow measurement using electromagnetic flowmeter and flow rate meter to achieve. The head is measured by pressure transmitter, atmospheric pressure transmitter, liquid level transmitter. A pressure calibrator is used to calibrate the pressure gauge. Power measurement using torque and power measurement dynamometer. Can be achieved through intelligent torque sensors, signal conversion cabinet, torque and speed measuring instrument, speed transmitter, temperature sensor, DC digital voltage ammeter, three electrical parameters measuring instrument to achieve. The calibration of the electrical parameter instrument is made by AC / DC calibration meter. Vibration and noise measurements were used vibration meter and noise meter, the motor temperature measurement using three-pass measurement of temperature rise instrument. The choice of specific models should be selected according to the actual situation to meet the corresponding parameters calculated to meet the accuracy requirements.
According to the actual needs of the system, taking into account the relevance of their equipment and the actual working conditions, the system decided to adopt a distributed structure and RS485 / PROFIBUS bus. Measurement and control system set up two sets of computer monitoring and data processing computer, the need to set the projection screen and multimedia presentations. Two sets of industrial computer are used to control different test stations respectively. The control of the test is concentrated in the central control room. Test parameter adjustment through the electric control valve and Siemens MM440 inverter to achieve regulation. At the same time show the operation of the system, including the direction of flow of water, control valve opening and closing, the system is running normally, and large-screen display of the pump operating point of the relevant parameters to facilitate on-site regulation. Data acquisition and processing through the sensor and the secondary instrument connected with the data acquisition computer, data acquisition all automated, automatic acquisition, automatic processing and print output. System main control equipment by the Siemens CPU315-2DP + digital / analog acquisition module. The upper data acquisition system uses the Siemens WinCC software.
The system can accurately collect a variety of test data, and can control the pump running through the inverter at a variety of different operating frequencies, so that the pump test more comprehensive.
The system has been successfully used in a well-known domestic military design institute of the pump test system, stable and reliable, to achieve the automation of pump testing. The communication program can also be used in the PLC and other equipment in the communication process, similar to the application of the project has a certain reference.
Manufacturers recommend: Shenlong stainless steel fountain submersible pump
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