First, the application of frequency converter in the constant pressure water supply automatic control system:
The frequency conversion speed-regulating constant pressure water supply equipment has made its leap from the beginning of the 1990s with its advantages of energy saving, safety, and high quality water supply quality. 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.
The working principle of frequency conversion constant pressure water supply automatic control system is as follows:
When the system is in normal operation, the user uses a pressure sensor on the water pipe network to sample the user's water pressure, and converts the pressure signal into an electrical signal, transmits it to the PID controller, and then compares and calculates the pressure value with the user. And the result of comparison and calculation is converted into the frequency adjustment signal and the pump start number signal sent to the inverter and programmable controller (PLC) respectively; the inverter is used to adjust the power frequency of the pump motor, and then adjust the pump speed; programmable The control device controls the operation of the water pump according to the pump number signal transmitted from the PID regulator. Through the adjustment of the pump start and stop times and the speed of the mid-frequency conversion pump, the water pressure in the user's pipe network is constantly shifted to the user's pre-designed pressure value, so that the “lifting†water volume of the water supply pump group and the user's pipe network are constantly changing. The water consumption remains the same, achieving the goal of “variable constant pressure water supplyâ€.
The following application system of Victau vector frequency converter in a municipal water supply project is composed of a programmable controller, Victrolo Inverter and electric motor. The programmable frequency controller (PLC) is used to control the frequency conversion governor, and the constant pressure of the water pump is controlled. Water supply function. Through the pressure sensor installed on the pipe network, the water pressure is converted into an analog signal of 4-20mA, and the speed of the electric water pump is changed by the built-in PID controller of the PLC. When the user's water consumption increases, the pipe network pressure is lower than the set pressure, the output frequency of the frequency conversion speed regulation will increase, the pump speed will increase, and the water supply will increase. When the set pressure is reached, the speed of the electric water pump will not change. Make the pipe network pressure constant at the set pressure and vice versa. This achieves constant pressure water supply through closed-loop PID control.
When the motor fails (ie: overvoltage, overcurrent, overload, motor overheating protection), the system will automatically stop running, and when the system recovers, follow the operating procedures again.
Second, the application of the frequency converter in the textile machinery The majority of the cotton textile equipment uses the frequency conversion velocity modulation technology, the programmable controller (PLC) technology, also already quite a part of products have used the industrial computer, the monolithic integrated circuit, the exchange servo system Touch screen man-machine interface and fieldbus technology have realized the mechanical and electrical integration of textile machinery products. Frequency converters are widely used in textile equipment, from flower cleaning, carding, drawing, roving, spinning, winding, warping, Sizing, shuttleless looms, etc. have all been used. According to the use situation can be divided into three types:
The first type: A host uses an inverter to control a motor, such as draw frame, roving frame, spinning frame and so on.
The second type: A host computer uses a frequency converter to control multiple motors, such as a yarn-winding machine, an air-spinning machine (single-spindle single-motor transmission type) and so on.
The third category: A host uses multiple inverters to control multiple motors separately, and the computer controls multiple motors to coordinate and synchronize, and to achieve winding forming functions, such as canceling the new roving frame of the cone wheel, canceling the long sideshaft transmission and no The new sizing machine of the transmission, the sectional warping machine and so on.
Capacity range of frequency converters used on textile equipment:
0. 37KW to 500KW, more than 90% to 0.37KW to 37KW.
Wei Ke vector converter in carding machine application.
The design of the old carding machine used by a cotton spinning mill was unavoidably flawed in design due to factors such as the technical conditions at the time, equipment manufacturing costs, market needs, and other factors. For example, the electromagnetic clutch in the drive system of the A186D type carding machine is often caused to stop due to high failures. From time to time, a fire alarm occurs, causing a certain loss of production efficiency and product quality. It requires a lot of manpower and material resources to maintain and maintain. The inertia wheel electromagnetic clutch was abandoned. This produces fine strips in the process from slow to fast, severe edges, and the phenomenon of web breaks affecting the quality of production. In order to avoid this phenomenon, operators use improper methods of operation to make up for the above-mentioned equipment defects, but it is also undesirable to create a large number of scraps.
The process of improving the running status of carding machine with Vecco vector converter: A186D carding machine is designed to achieve double speed motor, inertia wheel and electromagnetic clutch in mechanical transmission in order to make Doffer reach up and down smoothly, using electrical and mechanical means. to fulfill. In the design of the A186E, A186F, and FA201 carding machines, the star-triangle conversion control of the motor was added, which further improved the frequency of rise and fall. The FA201B, FA212 carding machine adopts the Victau vector frequency converter speed regulation, thus realizes the random adjustment of the doffer's ramp-up slope, and the variable function of the doffer process speed. Provide a good example for the transformation of old machines.
The A186D old machine vector inverter speed control transformation, not only improve the performance of the equipment and reduce the downtime. It can also increase production efficiency and production quality.
Third, the application of frequency converter in the lifting equipment Victretic frequency conversion governor takes 32-bit microprocessor as the core, the internal includes control and drive two major parts. The inverter can start and stop, forward and reverse, S-curve acceleration and deceleration and multi-speed control through its external control terminals. Some parameters of the motor itself to be used in the vector control operation can be automatically measured by the inverter. In addition, the inverter also has over-current, overload, motor overheating, overvoltage and undervoltage, overspeed and stall protection. The inverter can also provide the operation stop signal, zero speed signal, speed arrival signal and operation preparation signal, etc. The programmable controller integrates the external signal and the control signal given by the inverter, and provides the external equipment and inverter with analysis and logic calculation. Out control command. The key to elevator speed control is to start acceleration and deceleration leveling, and to control the following points:
1. Start control to make the elevator start smoothly without impact, without reverse rolling, start control should be in the following order:
(1) First issue a pre-excitation command to the frequency converter to establish a magnetic field to the motor (at this time, the speed is given as zero);
(2) Issue the open brake command after the first stage delay;
(3) The speed command is given after the second stage delay confirms that the brake is open.
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