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Abstract: Aiming at the low self-control level of deep well pump group control system in brewery's water supply, it is difficult to meet the requirement of brewery's water supply. The control system of deep well pump group with high reliability and low cost has been developed.
Water supply is the lifeblood of beer production, beer demand for water production and large changes over time, taking into account the lower costs and reliable water supply, Yanjing Brewery's water supply is not by the water company, but by distribution within a few kilometers radius 100 meters of 25 deep well pump group to supply, in the past, because there is no automatic control system, in order to adapt to large changes in beer production on water consumption, 24 hours a day on duty to go on-site to open or close the pump, 365 a year Therefore, the factory decided to use the automatic control system, the early use of a factory inspection device, due to the quality of the system equipment However, due to the unreasonable design of the communication lines and the continuous failure of the system, the brewery made technical tests with the I-7000 series. The experimental results show that the I-7000 series can fully exert its monitoring effectiveness.
A? System Description:
The I-7000 series is a function module applied in the field, which can realize the collection and control of the on-site signal. The I-7000 series is based on the RS-485 bus. The master computer is obtained from the module through the RS-485 bus Data or issue commands to the module, so the RS-485 bus is very important for the I-7000 module, and the existing line situation is very unsatisfactory, the scene distribution distance, irregular wiring, therefore, the existing line segment processing , I-7510 relay module is added for every more than 1200 meters, I-7510 is added to the irregular line segment, and each transmission waveform is observed through an oscilloscope. The transmission characteristic is changed by adding terminal resistance to achieve the best transmission effect.
System block diagram is as follows:
The host computer is RS232 / 485 converted via I-7520 and connected to each well by wire. Each well has a 35- to 55-kilowatt three-phase motor driven by a three-phase motor that pumps deep well pumps and controls three-phase motors Open and stop, using 4-channel relay output module I-7060D, the use of voltage / current sensor output 4 ~ 20 mA signal sent to I-7017 to collect three-phase voltage and three-phase current, reflecting the normal operation of three-phase motor or not.
Second, system functions and software:
According to the requirements of beer production, the operation of 25 deep-well water pumping pumps is required to be set as manual and automatic working modes. In manual working mode, the operator can open or close any well arbitrarily. Under the automatic working mode, Collected water level to decide how many wells to open or close, and according to the water level changes within the unit time to control the pump speed on or off. Pumps pumping water to the total water to the pool and then flow to the factory pool , The pressure on the water pipe is limited, and the pump starts to exert tremendous pressure on the water pipe. Therefore, the time for opening the water pump is strictly controlled and can not be opened at the same time. It must be turned on one by one and maintain a certain delay. In order to When the pump is turned on, the three-phase working voltage and current of the motor should be monitored. When there is imbalance and defects, the motor should be turned off and an alarm should be generated to facilitate timely maintenance to avoid causing the motor damage.
Figure 1:
Figure II:
The system uses the FIX map control software, FIX is the United States Intellution company launched real-time monitoring and configuration of industrial software platform. The powerful features of FIX and Visual C, the system software mainly to achieve the following functions:
1, The overall picture: Overview Map Real-time automatic tour or manual display of all well data, two pool water level, is the main interface for field operations, as shown in Figure II.
2, automatic / manual switch: The system provides two modes of operation: the first for the whole manual mode, that is, the system only from the surveillance role, the switch pump by the operator to complete; second automatic mode, that is, the program set the water level After the system automatically track the water level, without human intervention. Automatic / manual switch to complete the main manual and automatic switching.
3, the report print: The use of Visual Basic database to achieve real-time data and historical data sharing, timed automatically print the daily report, and ready to print real-time reports.
4, Alarm: The system can define alarm events in advance, such as water level overrun, three-phase voltage / three-phase current overrun. When an alarm event occurs, the system will display this alarm, meanwhile, this alarm event forms a notepad file; Event is automatically deleted after confirmation. After the actual operation of the test, the system has fully achieved its intended purpose. Which ensures the reliable water supply requirements of beer production, improves the automation level, reduces the labor intensity of duty personnel and achieves good social benefits and economic benefits.
Ningbo Beilun JCD import & export co ltd. , https://www.boss-metal.com