Application of servo control system in web cutting machine
1. introduction
With the continuous development of the paper industry, cutting positioning accuracy has become a key guarantee for finished products. Since most domestic manufacturers use frequency converters and synchronous control cards to ensure accurate positioning accuracy, our company has gathered a The industry elites who are struggling in the industrial control industry, while injecting advanced foreign technology, supplemented by the diligence and wisdom of Waco people, have developed a servo drive controller in the paper cutting industry, which has been recognized by industry insiders and is also widely produced Applications.
2. Equipment structure
The structure of the equipment: first introduce the entire equipment production process, as shown in figure D1 is a tension control system, it is a magnetic powder clutch, the web is clamped by it, when the tension is uneven, it can automatically adjust the web tension Degree, so that the paper will not be broken or skewed during the work process. Figure M2 is a paper feed motor. It is an asynchronous motor with an encoder controlled by a frequency converter, and the frequency converter is used to adjust the speed. M1 is a paper cutting motor and an asynchronous motor with encoder controlled by ONK-LS servo controller. M3 and M4 are frequency conversion motors controlled by two small frequency converters to adjust the speed of the cut paper to the hopper. These two small motors drag the belt to move, and the cut paper is automatically placed on the belt and then passed to Storage bucket.
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3. Control principle
With ONK-LS driver built-in PCMD positioning function, it can follow the code output of the previous motor, and execute digital precise proportional linkage control according to the established ratio G = (F133 / F134) (ie internal electronic gear ratio).
As shown in the figure: M1 motor is controlled by ONK-LS servo controller, M2 motor is controlled by inverter, connect M2 motor PG2 encoder line to ONK-LS control card, M1 motor PG1 encoder is also connected Connected to the control card connected to ONK-LS, PG1 encoder has pulse output when M1 motor is running. This pulse is input to the ONK-LS control. Because ONK-LS has a built-in tracking control card and adopts the position tracking control mode, it accepts the pulse input by PG1 and performs digital proportional linkage through the ratio of parameters F133 and F134 according to the ONK internal proportional linkage function. To determine the output speed of the M1 paper cutting motor. (Example: The M2 motor determines the paper feed speed. The smoother the paper feed speed, the more stable the pulse output of the M2 encoder. The more stable the ONK-LS receives the pulse input of the M2 encoder, the more stable the output speed of the M1 motor. The better the flatness of the paper that comes out, the M1 motor drives the reel knife to cut the paper once, and the size of the paper to be cut can be changed by changing the electronic gear ratio inside the ONK-LS)
4. Wiring diagram: [next]
5. Man-machine drawing communication related settings
ONK-LS supports ModuleBus (RTU) communication format related parameters as follows:
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Support the direct change of related parameters, for example, the proportional linkage value can be changed directly by touch to change the size of the paper to be cut, and the current value, voltage, motor revolutions, etc. can also be monitored.
6. Actual production application
Asynchronous motor and ONK-LS servo (with its own motor self-learning ability) are used to drive the roll paper cutting motor, that is, the rated power is 15KW, the current value is 30.7A, the rated speed is 1460 rpm, and the motor encoder The 2500-line paper cutting motor matches the ls servo with a rated power of 15KW and a current value of 32A. The paper clamping adopts the tension control system to make the speed of paper feeding constant, which can ensure the accuracy of the length of the cut paper. The paper feeding motor uses a frequency converter to control the motor. The characteristics are the same as the paper cutting motor, in which the motor encoder is also 2500 lines. The principle of control is to take the drive motor encoder of the paper feed as the main encoder input, and the paper cut motor encoder as the slave encoder input. The paper cut motor encoder follows the pulse output of the paper feed motor encoder. Through the proportional value F133 (mechanical structure determines 2457) and F134 (set the cutting length to 700mm), when the feeding speed is 200 meters, the number of cuts is 150 sheets, the maximum error after testing is 0.30mm, the finished paper is used Two frequency converters drive two small motors to send the cut paper to the cutting table, and the whole cutting process is completed. It is fast and stable throughout the cutting process.
7. Comparison of inverter plus synchronization card and ONK-LS servo controller
Two sets of the same mechanical equipment are used, one is controlled by the inverter and the synchronous card to control the cutter motor, and the other is controlled by the ONK-LS servo controller. The cut paper is the same size. 1> When the speed is 60 meters / minute Next, the accuracy of the paper cut by the inverter plus the synchronous card is 0.45mm, the accuracy of the paper cut by the ONK-LS servo controller is 0.31mm and the flatness of the cut paper is less effective than the ONK-LS servo. 2> When the speed is 120m / min, the accuracy of the paper cut by the inverter plus synchronous card is 0.40mm, the accuracy of the paper cut by the ONK-LS servo controller is 0.30mm and the flatness of the cut paper is better than ONK- The effect of the LS server is poor. 3> When the speed is 200m / min, the accuracy of the paper cut by the inverter plus the synchronous card is 0.43mm, the accuracy of the paper cut by the ONK-LS servo controller is 0.30mm and the flatness of the cut paper is better than ONK- The effect of LS servo is poor. From the above three cases, it can be explained that the ONK-LS servo controller has a good overall system stability and high control accuracy regardless of low or high speed.
8. Functions and features of ONK-LS servo controller
Functions of ONK-LS servo controller:
1. Can drive permanent magnet brushless servo motor, induction AC servo motor, servo spindle motor and induction general AC motor.
2. With motor parameter self-learning function, it is more adaptable to different motors.
3. Multiple control modes: position mode, speed mode, torque limit mode.
4. During operation, speed mode and position mode can be switched; in position mode, positioning mode and tracking mode can be switched.
5. Speed ​​and torque limit function.
6. Electronic gear function.
7. Built-in counter, timer, trigger module; can replace simple PLC control.
8. Built-in PID function.
9. ModBus communication control.
10. Flexible definition of digital and analog input and output definitions.
11. Recognizable printing cursor point automatically corrects the cutting length.
12. During the acceleration of the S curve, torque compensation measures can also be made to quickly synchronize and reduce planting errors. The four-segment S curve (forward acceleration / deceleration, reverse acceleration / deceleration can be set individually).
Features of ONK-LS servo controller:
1. It can realize complete synchronous control of the motor, proportional tracking control and positioning drive control.
2. Possess internal register, can realize precise point-to-point position control.
3. Built-in smooth curve, can reduce the vibration generated when the machine is started and stopped, extend the machine to reduce the vibration generated when the machine is started and stopped, and extend the service life of the machine; when the speed command quickly turns, you can use this function to achieve The continuous smoothness of speed and acceleration commands smooth curves with high accuracy and high compliance.
4. The characteristics of low-speed operation are good. Under the 1rpm command, the actual variation error of the speed of one revolution is only 0.5% at most.
5. The acceleration time from -3000rpm to 3000rpm is 20ms.
6. The speed is up to 9000 rpm.
7. 10 input points and 4 output points can be provided to facilitate user selection and use, and users can define their own input and output.
9. Conclusion
This technology has been successfully applied and passed the certification of related industries, and has a wide range of application prospects, while filling a large gap in the domestic market.
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Xi'an Double H Health Technology Co., Ltd , https://www.dhextract.com