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The inverter PLC control cabinet has good system reliability ...
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ABB Siemens inverter control cabinet + constant pressure water supply PLC control cabinet
- 变频器PLC控制柜 Category: Inverter PLC control cabinet
- 全自动智能，人机界面 Product specifications: fully automatic intelligent, human-machine interface
- 中赢供水 Product brand: Zhongying Water Supply
- 变频器PLC控制柜在系统可靠性方面有良好的效果，提高生产效率，并且节能效益明显。 Product introduction: The inverter PLC control cabinet has a good effect on system reliability, improves production efficiency, and has obvious energy saving benefits. Inverter PLC control cabinet adopts programmable controller, so it can realize the whole process control of water supply system under various working conditions. System configuration is reasonable, sex ...
Application example of inverter PLC control cabinet in non-negative pressure water supply equipment
The birth of inverter PLC control cabinet
The inverter PLC control cabinet has a good effect on system reliability, improves production efficiency, and has obvious energy saving benefits. Inverter PLC control cabinet adopts programmable controller, so it can realize the whole process control of water supply system under various working conditions. The system has reasonable configuration, reliable performance, convenient operation, friendly man-machine interface, complete display, tabulation and drawing functions, and strong practicability. The use of this system has promoted the improvement of product quality and management level of enterprises and units.
In the implementation of the sustainable development strategy today, the application of the inverter PLC control cabinet has special significance. With the development of computer control technology, traditional relay control technology must be replaced by PLC control technology based on computer technology. The excellent performance of PLC itself makes the system based on PLC control economical, efficient, stable, and easy to maintain.
It is the general trend of the water supply industry to realize various control and adjustment functions of the non-negative pressure water supply equipment through PLC.
主要装置包括：可编程控制器（PLC）、ABB变频器、压力传感器、PID控制器、动力控制线路以及相关软件控制单元。 The main devices of the inverter PLC control cabinet include: programmable controller (PLC), ABB inverter, pressure sensor, PID controller, power control circuit and related software control unit. The user knows and controls the operation of the system through only the lights and buttons and transfer switches on the control cabinet panel. Through the pressure sensor installed on the outlet pipe network, the outlet pressure signal becomes a standard signal of 4-20mA and is sent to the PID regulator. After calculation and comparison with the given pressure parameter, an adjustment parameter is obtained and sent to the inverter. The frequency converter controls the speed of the water pump, adjusts the water supply volume of the system, and maintains the pressure in the water supply system pipe network at a given pressure; when the water consumption exceeds the water supply volume of one pump, the pump is added through the PLC controller. According to the amount of water consumption, the increase and decrease of the number of working pumps is controlled by the PLC and the frequency converter's speed regulation of the pumps to achieve constant pressure water supply . When the water supply load changes, the voltage and frequency of the input motor also change, which forms a closed-loop control system based on the set pressure.
At the same time, the system is equipped with a time controller and PID controller, which makes it have the function of timing pump change (that is, clock control function, realized by the time controller) and dual working pressure setting function (implemented by PID controller and time controller). In addition, the system also has a variety of protection functions, especially the hardware / software backup water pump function, which fully guarantees the timely maintenance of the water pump and the normal water supply of the system.
Inverter PLC control cabinet wiring diagram
Parameter diagram of PLC control cabinet debugging for inverter with no negative pressure water supply equipment
特点分析 Analysis of inverter PLC control cabinet
Compared with traditionally controlled motors, inverter PLC controlled motors have the most practical energy savings. The motors supplied according to the water injection and oil delivery requirements are economical operating conditions, which can save 60% of electricity.
2. Reduced operating costs
The operating costs of traditional motors consist of three items: initial purchase costs, maintenance costs, and energy costs. The energy cost accounts for about 77% of the operating cost of the motor. By reducing the energy cost by 44.3%, coupled with the reduced impact on the equipment after the start of frequency conversion, the amount of maintenance and repair will also decrease, so the operating cost will be greatly reduced.
3.Improve pressure control accuracy
具有精确的压力控制能力。 The inverter PLC control cabinet has precise pressure control capability. Match the pressure output of the motor to the amount of water injection required by the system. The output of the inverter-controlled motor changes with the speed of the motor. As the accuracy of the frequency control motor is improved, it can keep the system pressure change of the pipe network within the range of 3 pisg, that is, within the range of 0.2 bar, which effectively improves the quality of the working conditions.
4.Extend the service life of the motor
The inverter starts the motor from 0HZ, and its starting acceleration time can be adjusted, thereby reducing the impact on the electrical and mechanical parts of the motor at the time of starting, enhancing the reliability of the system, and extending the service life of the motor. In addition, variable frequency control can reduce the current fluctuations when the unit starts. This fluctuating current will affect the power consumption of the power grid and other equipment. The inverter can effectively reduce the peak value of the starting current to a minimum.
5.Lower motor noise
According to the requirements of the motor's working conditions, after the frequency conversion is installed, the motor's running speed is significantly reduced, so the noise during the operation of the motor is effectively reduced.
功能介绍 Function introduction of inverter PLC control cabinet
电源切换与保护功能 1.Power switching and protection function
通常设计有断路器元件，它连接着进线电源，可以帮助变频控制柜完成电路的通断操作，并能够在电路和变频器出现短路或过载时提供保护。 The inverter PLC control cabinet is usually designed with a circuit breaker element, which is connected to the incoming power supply. It can help the inverter control cabinet to complete the on-off operation of the circuit and provide protection when the circuit and the inverter are short-circuited or overloaded. In addition, the inverter cabinet can also cut off the power supply during the maintenance of the motor to ensure the safety of the operator.
变频调速功能 2.Variable frequency speed regulation function
的控制面板上设置有变频调速用的电位器，可以根据操作人员的输出频率，向电机输送指令信号，控制电机的转速。 The control panel of the inverter PLC control cabinet is provided with a potentiometer for frequency conversion and speed regulation, which can send a command signal to the motor according to the output frequency of the operator to control the speed of the motor. Some products in the frequency conversion control cabinet are equipped with a power frequency switching function to ensure that when the inverter fails, the motor is switched back to the power frequency power supply through an automatic control loop.
直观控制功能 3.Intuitive control function
的柜体上设计有显示设备与操作面板，它与变频控制柜内部的电器元件相连，可以直观显示变频控制柜的运行状态，同时方便操作人员控制变频装置的运行，及对电机等被控制设备进行现场操作。 The cabinet of the inverter PLC control cabinet is designed with a display device and an operation panel. It is connected to the electrical components inside the inverter control cabinet. Motors and other controlled equipment perform field operations.
的柜体上，还安装有各种仪器仪表及指示灯，例如电压表、电流表、频率表，及电源指示灯、报警指示灯、运行指示灯、工频指示灯等。 The cabinet of the inverter PLC control cabinet is also equipped with various instruments and indicators, such as voltmeters, ammeters, frequency meters, and power indicators, alarm indicators, operation indicators, power frequency indicators, and so on. The running and operating status of the frequency conversion control cabinet can be directly reflected on various instruments and indicators to achieve continuous monitoring of the working status of the frequency converter.
安全防护功能 4. Safety protection function
将各种包括变频器在内的各种电气元件都集中在柜体内，这样可以减少外部环境对电气元件的影响程度，降低电气元件受环境污染的程度，也降低变频控制柜操作人员的触电危险，因此具有较好的安全防护效果。 The inverter PLC control cabinet collects various electrical components including the inverter in the cabinet. This can reduce the impact of the external environment on the electrical components, reduce the degree of environmental pollution of the electrical components, and reduce the frequency conversion control cabinet. Operators are at risk of electric shock and therefore have better safety protection effects.
Control motor power: 0.18-250KW;