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PLC-based remote monitoring system for variable frequency towerless water supply equipment
Time: 2020-02-07 15:58 Source: win of Water: Water factory in winning hits: Times
PLC-based remote monitoring system for variable frequency towerless water supply equipment


In the water source, many eyes are scattered on the reservoir. In order to ensure the safe, reliable and continuous production of water supply. In view of the characteristics of the water production process of the water plant and the functional requirements of the control system, we adopt a Siemens PLC-based variable frequency towerless water supply equipment system.
Overview of programming controller for variable frequency towerless water supply equipment
PLC is a programmable controller, which is a new type of industrial control device based on computer technology. IEC has defined PLC as follows: "PLC is an electronic system for digital operation, designed for applications in industrial environments. It uses programmable memory to store logic operations and sequences in its internal storage. Control, timing, counting and arithmetic operations, and other digital and analog inputs and outputs to control various types of machinery and production processes. PLC and related equipment should be easily integrated with the industrial control system. The whole. The principle design of easy to expand its functions. "This passage fully reveals the characteristics and application fields of TPLC. It mainly has the following characteristics:
1. High reliability.
In order to meet the requirements of industrial production for the safety and reliability of control equipment, PLC uses microelectronic technology, and a large number of switching actions are completed by non-contact semiconductor circuits.
2. Strong environmental adaptability.
PLC has good environmental adaptability and can be applied to very harsh industrial sites. It can still work normally when the power is cut off instantly, and it has a good ability to resist electromagnetic interference between houses. It generally does not have high requirements on the ambient temperature. It can work normally under the environment temperature of -20 to 65 degrees and relative humidity of 35% to 85%.
3. Flexible and versatile.
PLC has a high degree of flexibility when completing a control task. First of all, the PLC product L series is three series, the structure is various, and there is a lot of choice on the model. Secondly, the PLC of the same model has great flexibility in hardware configuration. Users can choose different types of input and output modules or special function modules to form control devices with different hardware structures according to the requirements of different tasks.
4. Easy to use and simple to maintain.
PLC controlled input and output module. The special function modules have plug-and-remove functions and are easy to connect. For logic signals, the input and output are switched on and off without level conversion and drive amplification. For analog signals, the input and output are standard signals from sensors, instruments and driving equipment. The connection of the various input and output modules to external devices is simple. The entire connection process requires only one screwdriver.
Design and Selection of Controlled Turnover Scheme of Frequency Conversion Towerless Water Supply Equipment System
The frequency conversion towerless water supply equipment system mainly consists of a pressure sensor, a pressure transmitter, a frequency converter, a constant pressure control unit, a water pump unit and a low-voltage electrical appliance. The main design task of the variable frequency towerless water supply equipment system is to use a constant pressure control unit 馒 inverter to control one water pump or cyclically control multiple water pumps to achieve constant water pressure in the pipe network and soft start of the pump motor, and the frequency conversion water pump and J: frequency The switching of the water pump must also be able to transmit operating data. According to the design task requirements of the system and the place where the system is used, there are the following options to choose from:
1. There is a dedicated inverter for water supply + pump unit + pressure sensor.
This frequency conversion towerless water supply equipment control system has a simple structure. It integrates hardware such as a PID regulator and a PLC programmable controller on the frequency converter water supply substrate, and realizes the functions of electrical control systems such as PLC and PID by setting instruction codes. Although it simplifies the circuit structure and reduces the equipment cost, it is cumbersome to display the pressure setting and pressure feedback value. It cannot automatically achieve different constant pressure requirements in different periods. When debugging, system optimization of PID adjustment parameters is difficult. The adjustment range is small, the system is stable, and dynamic performance is not easy to guarantee. The expansion function of its output interface lacks flexibility, data communication is difficult, and the capacity with load is limited, so it is only suitable for small capacity occasions with low requirements.
2. Universal inverter + single-chip microcomputer (including variable frequency control and regulator control) + human-machine interface + pressure sensor.
This method has high control accuracy, flexible control algorithms, convenient parameter adjustment, and high cost performance. However, the development cycle is long, and once the program is solidified, it is more troublesome to modify. Therefore, the flexibility of field debugging is poor, and the inverter is running. Interference will occur. The greater the power of the inverter, the greater the interference it generates, so corresponding anti-interference measures must be taken to ensure the reliability of the system. This system is suitable for small capacity variable frequency constant pressure water supply in a specific field.
3. Universal inverter + PLC (including frequency control, regulator control) + configuration software ten pressure sensors.
This control method is flexible and convenient, and has a good communication interface. It can easily exchange data with other systems: it is highly versatile. Because of the serialization and modularization of PLC products, users can flexibly compose various scales and different requirements. Control System. In terms of hardware design, it is only necessary to determine the hardware configuration of the PLC and the external wiring of the UO. When the control requirements change, the control program in the memory can be easily changed through the PC, so field debugging is convenient. Through the comparison and analysis of the above several schemes, it can be seen that the control method of "inverter main circuit + PLC (including variable frequency control, regulator control), ten configuration software, and ten pressure sensors" is more suitable for this system. This control scheme has the advantages of flexible and convenient extended functions and convenient data transmission, and can also meet the requirements of system stability and control accuracy.
Performance characteristics of controller for variable frequency towerless water supply equipment
1. High efficiency and energy saving.
Optimized energy-saving control software enables the pump to achieve maximum energy-saving operation. Known from the formula of electrical engineering. The system power consumption has a square relationship with the motor speed, when the pressure is constant. The water output of the pump is proportional to the E speed of the motor. This equipment uses constant voltage: r mode. When the water consumption is reduced, the system maintains a constant pressure in the pipe, and the water supply is reduced by reducing the speed of the pump, and the power consumption is reduced according to the cubic characteristic. The pressure of the pipe network is set according to the actual water usage, and the water output of the pump is automatically controlled, which reduces water running and leakage.
2. Low equipment investment and small floor area.
Compared with other water supply methods, the frequency conversion towerless water supply equipment system, because the main equipment is only control cabinets and pumps, saves a lot of equipment floor space, which greatly saves investment in the construction, and as far as the equipment itself, the more water Larger, the price advantage of using variable frequency constant pressure water supply equipment becomes more significant.
3. The equipment operates reasonably, with high reliability and flexible configuration.
The variable frequency towerless water supply equipment adopts closed-loop regulation control technology to achieve constant pressure water supply and avoid waste of electrical energy caused by overpressure water supply. The inverter adopts the soft-start working method, which eliminates the impact and interference of direct starting on the power grid, completely avoids the situation of large current and water pressure surge when the pump starts, reduces the impact on the power supply grid, and reduces the failure of the motor and electrical components rate.
4. Networking function.
Frequency conversion towerless water supply equipment adopts full Chinese industrial control configuration software to monitor each station in real time, such as motor voltage, current, working frequency, pipe network pressure and flow. And it can accumulate the power consumption of each station, accumulate the water output of each pump, and provide various forms of printed reports for analysis and statistics.
5. Reduce pollution.
Because frequency conversion and constant pressure speed regulation should be connected to water supply from the water source, secondary pollution of the original water supply method is reduced, and many sources of infectious diseases are prevented.
V. Application occasions of variable frequency towerless water supply equipment
1.Centralized living water supply system in residential areas, residential buildings, villages and towns;
2.High-rise buildings, hotels, restaurants and other living water supply systems;
3. Comprehensive water supply systems for office, commercial and commercial buildings:
4.Waterworks, water supply booster pump station;
5. Industrial and mining enterprises' production, domestic water supply, constant pressure flow water supply process, etc.




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