GT3576D TURBOCHARGER,GT2259LS TUBO,GT3271LS TURBO Fengcheng Fire Turbocharger Manufacturing Co; Ltd. , https://www.fireturboleader.com
Keywords: Inverter; V360; PID; tension; blown film machine; winder Introduction Blown film machine is a device that heats and melts plastic particles and blows the film, which is mainly composed of blown film and winding. The role of the winding part is to wind the blown film into a roll, and to make the rolled film smooth and wrinkle-free. The curling is neat, and the film on the reel needs to be moderately tight so as to prevent the film from stretching and ensure the quality. Therefore, constant tension control must be used when winding. At present, the industry mainly uses a torque motor to achieve the above control, but in the use process there is a need for manual adjustment, inconvenient operation, long-time operation when the torque motor heat is high, the controller is easily damaged, the reliability is not high shortcomings . This article intends to combine the Quartet V360 frequency converter, introduce a kind of constant tension control system for the film blowing machine winding, while ensuring the winding process can significantly improve the equipment's ease of operation and reliability.
Blown film winding process introduction In the entire winding process must maintain a constant tension, and without manual adjustment;
When the empty roll starts, the tension cannot be too large to prevent the film from wrinkling. When the full disk is running, the tension cannot be too small to prevent the film from taking up too much.
The system responds sensitively, and can be quickly adjusted during the acceleration and deceleration process according to the change of the front speed and tension to ensure the tension is constant;
It is required to quantify the tension, that is, the tension can be set according to the process requirements of different film production.
In response to the above requirements, the following control system was designed using the V360 frequency converter.
The control scheme is shown in Figure 1 below. The constant tension control of the winding is fed back from the tension sensor output voltage signal in the system to the PID control system of the inverter. After the PID controller automatically calculates, the inverter changes the output frequency to adjust the output. The reel motor runs at a constant speed to maintain tension. In fact, this is a direct tension control method because the PID adjustment is based on the feedback value of the tension sensor. The feedback value directly reflects the tension in the winding process, so the constant tension control requirements can be achieved. . 
System Block Diagram, Wiring Diagram and Control Principles The system block diagram is shown in Figure 2 below: 
The system uses closed-loop vector mode to give the PID output as torque. The feedback signal of the tension sensor is connected to the analog input AI1 (0~10V), and the desired tension value is set as a percentage of the PID reference value. During the operation of the system, the feedback signal is always compared with the given value. The PID controller automatically calculates the difference according to the difference. The PID output value determines the current output torque of the motor, thus changing the output frequency of the inverter to adjust the winding The speed of the motor ensures that the film tension during the winding process is constant. 
Concluding remarks This article describes a constant tension winding control system based on the Quartet V360 vector converter. This solution makes the tension of the film in the winding process very stable and can be automatically adjusted according to the changes in the front speed and the tension in the winding process. For models with multiple winding systems, they can also achieve smooth switching between each other. The entire system is stable and reliable, and it has been successfully applied to multiple rolling machine winding systems.
references:
"V360 series high-performance vector inverter manual" Shenzhen Sifang Electric Technology Co., Ltd.
Application of Quartet V360 Frequency Converter in Film Blowing Machine
Abstract: This article describes the successful application of the Quartet V360 vector converter in the film blowing machine.
figure 1
figure 2
The system wiring diagram is shown in Figure 3 below: image 3
Frequency converter parameter setting table