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The general rule is that the water pressure of the urban pipe network only guarantees the use of water for the buildings below the 6th floor, and the rest of the upper floors must “upgrade†the water pressure to meet the water requirements. Most of the past used traditional water towers, high water tanks, or pneumatic tank pressurization equipment, but they all had to “lift†the water by the water pump at a pressure higher than the actual water level. As a result, the shaft power and energy consumption of the water pump increased. .
Since the introduction of general-purpose inverters, frequency control technology has been widely used in various fields. The frequency conversion speed-regulating constant pressure water supply equipment has taken advantage of its energy-saving, safe and high-quality water supply quality, which has enabled China's water supply industry to undergo a leap from the beginning of the 1990s. The constant pressure water supply speed control system realizes the stepless speed regulation of the water pump motor, automatically adjusts the operating parameters of the system according to the change of the water consumption, automatically adjusts the operating parameters of the system in the change of the water consumption, and maintains the constant water pressure when the water consumption changes to meet the requirement. Water requirements are today's most advanced and rational energy-efficient water supply systems. In the practical application has been greatly developed. With the rapid development of power electronics technology, the functions of frequency converters have become stronger and stronger. It is of great significance to make full use of the built-in various functions of the frequency converter to reasonably design variable frequency speed control constant pressure water supply equipment, reduce costs and ensure product quality.
First, the composition and principles of constant pressure water supply system Frequency control constant pressure water supply control system through the measured pipe network pressure, after the inverter's built-in PID regulator operation, adjust the output frequency, to achieve constant pressure water supply pipe network. Inverter frequency over limit signal (usually used as pipe network pressure limit signal) can timely notify the PLC to carry out logic pump switching. In order to prevent the occurrence of water hammer phenomenon, the start-stop of the pump will link its outlet valve.
The diagram of how the system works is shown below. Assume that the entire system consists of four pumps, one inverter, one PLC, one pressure transmitter, and several auxiliary components. The function of each part is as follows: The pressure transmitter installed on the water supply pipeline converts the pressure of the pipe network into an electrical signal of 1-5 volts; the frequency converter governor is used to adjust the pump speed to regulate the flow; the PLC is used for logic switching.
In addition, the above system is also equipped with a peripheral auxiliary circuit to ensure that the automatic control system can maintain system operation through manual adjustment to ensure continuous production.
Second, equipment selection instructions Frequency constant pressure water supply system is mainly composed of frequency control cabinets, pressure sensors, pumps and other components. The frequency conversion control cabinet is composed of circuit breakers, frequency converters, contactors, intermediate relays, and PLCs.
1 Selection principles of water supply system (1) The capacity of the reservoir should be greater than the maximum water supply per hour.
(2) The lift of the pump should be greater than the actual water supply height.
(3) The sum of the pump flow should be greater than the actual maximum water supply.
(4) Variable frequency control cabinet selection:
The user can determine the pump model and number based on the amount of water supply and the height of the water supply, and then select the control cabinet.
2 The inverter is recommended to use ABBACS600 series inverter according to the process requirements. The ACS600 series inverter is a high-performance inverter that ABB uses direct torque control (DTC) technology combined with many advanced manufacturing processes. It has a wide power range, excellent speed control and torque control features, complete protection functions and flexible programming capabilities, high reliability and small size.
The main technical data:
Power range: 2.2-3000kW
·Power supply voltage: 380/400/415/440/460/480/500VAC 3 phase ±10%;
·Power frequency: 48-63Hz
Control connection: 2 programmable analog inputs (AI); 1 programmable analog output (AO); 5 programmable digital inputs (DI); 2 programmable digital outputs (DO).
Continuous load capacity: 150% In, 1 minute per 10 minutes • Serial communication capability: The standard RS-485 interface allows the drive to be easily connected to a computer.
·Protection features: overcurrent protection, I2t, overvoltage protection, undervoltage protection, overheat protection, short circuit protection, grounding protection, undervoltage buffering, motor under/overload protection, stall protection, serial communication fault protection, loss of AI signal Protection and so on.
Outer structure is compact and easy to install. The products have passed various electrical safety specification certifications and are in line with GE, UL and the quality certification system ISO9001 and ISO4001.
The unique direct torque control (DTC) function of ABB frequency converter is the best motor control mode at present. It can directly control the core variables of all AC motors. Without speed feedback, precise control of motor speed and torque can be achieved.
ACS600 frequency inverter includes eight application macros such as PID, PFC, and pre-flux. You only need to select the desired application macro. All corresponding parameters are automatically set, and the input and output terminals are also automatically configured. These preset application macro configurations save a lot. Commissioning time, reduce errors.
3 Programmable logic controller PLC recommends Siemens S7-200 type. SIMATICS7-200 programmable controller is a modular small and medium-sized PLC system that can meet the application of medium performance requirements; a wide range of various functional modules can be very good to meet and adapt to automatic control tasks, a variety of individual modules of the general combination For expansion; simple and practical decentralized structure and multi-interface network capabilities, making the application very flexible; user-friendly and simple fanless design; when the control task increases, it can be freely expanded; a wide range of integrated functions make its function Very strong.
A variety of performance-increasing CPUs and rich I/O expansion modules with many convenient functions allow the user to select the appropriate module based on the actual application. As the task scale grows, additional modules can be used to expand the PLC at any time.
Third, the scope of application 1 The system can be used for production, domestic water, can also be used for hot water supply, constant pressure sprinkler and other systems a. Can be widely used in industrial enterprises, living, production water supply systems and corporate-owned and renovation projects, Water plant, living area and fire water supply system.
b. Constant pressure, variable pressure, cooling water and circulating water supply systems that can be used in various applications.
c. It can be used in sewage pump station, sewage treatment and sewage lifting system.
d. Can be used for agricultural irrigation, garden spray, water features and music fountain system.
e. Can be used in hotels, large public buildings, water supply and fire protection systems.
2 Technical Specifications a. Maximum water supply height: 200 meters b. Maximum flow: 1000 cubic meters / hour c. Pressure fluctuation: ≤0.25 MPa d. Pump motor power: 0.75KW-280KW
Food printer
Print head
DX5
Print size
21*38cm
Print color
CMYK+LC LM
Print speed
A4 photo/163s
Printing resolution
5760*1440dpi
Nozzles
90*6=540
Interface
USB2.0
Net weight/Gross weight
35Kg/42Kg
Printer size
57*48*44cm
Height adjustment
Automatic
Working power
110-220V 50-60Hz 35-75W
Operation system
Windows 10/8/7/2000/XP/VISTA eta
Temperature
5-35º
Application Analysis of ABB Frequency Converter in Constant Pressure Water Supply Control System
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