Constant tension solution - VFD (Variable-frequency Drive) applied to winding and unwinding equipment

1. Model introduction of standard VFD (Variable-frequency Drive) and unwinding VFD (Variable-frequency Drive)

Sunwoele special-purpose VFD (Variable-frequency Drive) for the rewinding and unwinding industry, which can calculate the reel diameter.

HSF201 only supports speed control mode, HSF202 not only supports speed control mode, but also supports torque control mode.

The HSF200 standard product cannot calculate the roll diameter. The special VFD (Variable-frequency Drive) series for the winding and unwinding industry includes the main functions of the standard product, as well as industry-specific functions. It can calculate the roll diameter and has a corresponding function code for the roll diameter calculation. Make relevant settings, such as H0.00, H1.00, H1.24 and other function codes.

HSF201 standard products can only do a vector control without speed encoder feedback, such as woodworking machinery, musical fountains, escalators, ceramic machinery, centrifuges, plastic blow molding machines, fine wire drawing machines, grinding machines, engraving and milling machines, treadmills, large circles machine and other industrial applications.

HSF202 can do closed-loop vector speed control with speed encoder feedback, and can also do torque control, set PD.00=1VFD (Variable-frequency Drive) to change from speed control mode to torque control mode, here you can set P6.21 It can be used as torque setting or tension setting and speed limitation. The main applications are: replacing torque motors, leather machines, fishnet weaving machines, dipping machines, etc.

The HSF201 special VFD (Variable-frequency Drive) for the winding and unwinding industry can only realize the speed control of the swing lever or the floating roller with a position. The typical industry application is the speed control of the wire drawing machine. HSF201 special VFD (Variable-frequency Drive) for winding and unwinding industry can realize winding diameter calculation and PID adjustment composite control mode to realize constant line speed winding and unwinding control. The application industries mainly include: double frequency conversion wire drawing machine, straight wire drawing machine, layer winding machine, power pay-off frame, rewinding machine and so on.

HSF202 special VFD (Variable-frequency Drive) for winding and unwinding industry includes the main functions of HSF201 special VFD (Variable-frequency Drive) for winding and unwinding industry. It can not only control speed, but also control torque and realize constant torque. control or constant tension control. The main application industries are: roll paper slitting machine, compound machine, creasing machine, coating machine, paper making machinery, etc.

For general speed control, the HSF201 standard product is enough. If there is a tension swing rod or floating roller in the equipment, a special VFD (Variable-frequency Drive) with roll diameter calculation is used, that is, the HSF201 special VFD (Variable-frequency Drive) for the winding and unwinding industry. Frequency Drive) can achieve the control effect of this industry.

If coil diameter calculation is required in industrial applications, we have to consider whether to realize the winding or unwinding function, and set the function code parameters corresponding to H0.00.

When the torque control mode is used in industrial applications, the HSF202 series VFD (Variable-frequency Drive) is selected; for general winding leather and other materials, the constant torque control mode can be used to meet the production needs, that is, the HSF202VFD (Variable-frequency Drive) is selected. )standard product. However, as the winding diameter becomes larger, the tension of the winding material will become smaller and smaller, which may have little effect on ordinary leather winding, but may have a greater impact on paper and other materials. When it comes to unwinding To achieve speed synchronization for material pattern printing, constant torque control alone cannot meet the needs of production. We can use constant tension control mode. At this time, after setting H0.00=1 or 2, H1.00=1 is also required. To do tension control, then we must choose HSF202 special VFD (Variable-frequency Drive) for winding and unwinding industry. Regarding constant torque control and constant tension control, we will make a detailed description below.

2. Comparison of speed control and torque control schemes

Solution 1: Composite control mode

In the application of speed control, there is a tension swing rod or pneumatic floating roller in the system. This is a very typical information. We can use our compound control mode to calculate the winding diameter in the speed control mode to achieve constant linear speed control. . Then perform compound control to follow the speed of the previous stage and keep the line speed constant, we can explain it through a simple application. First of all, compound control is process open-loop and analog feedback closed-loop control. In the debugging guide, we have a wire drawing machine speed control scheme. The front stage has a main stretching VFD (Variable-frequency Drive), a winding VFD (Variable-frequency ) follows the speed of the previous stage, and the tension swing rod is used for PID adjustment, and V5-TVFD (Variable-frequency Drive) is used for winding diameter calculation of the take-up VFD (Variable-frequency Drive). The open-loop frequency of the process is input by AI1 to the speed of the previous stage, and P0.04=1 must be set, and P0.03=3 or 7 is set to compound control mode, and P1.05=2 analog feedback closed-loop control The main feedback is AI2 input dancer signal Analog. The balance position of the floating roller in the winding process has a target analog value, set P8.00=target analog value, if the actual position of the floating roller is around the target value, PID will be adjusted, superimposed on the basis of the given open-loop frequency A feedback amount, so that the constant line speed control in the production process can basically be realized. However, due to some equipment, the roll diameter changes greatly during the winding and unwinding process. We need to calculate the roll diameter, and the VFD (Variable-frequency Drive) follows When the roll diameter calculation becomes larger, the operating frequency will be automatically reduced to better achieve line speed synchronization.

Here we talk about the roll diameter calculation of speed control: HSF201 VFD (Variable-frequency Drive) tension control special manual for winding and unwinding industry The HO group function code is the key function code for roll diameter calculation. First of all, there must be a pre-stage speed analog input into the VFD (Variable-frequency Drive) AI analog channel dedicated to the HSF201 rewinding and unwinding industry, as a follow-up pre-stage speed. H0.00=1 is winding mode, H2.00 is unwinding mode. The function codes from H0.01 to H0.10 must be set correctly, and the calculation of coil diameter is related to these parameters. After setting these parameters, you can run the equipment first, observe the actual value of D2.21 coiling diameter calculation, and then visually check the actual coiling diameter of the coiled material. If D2.21 is too large, modify H0.04 to make the maximum linear speed smaller. , and vice versa. When the calculated coil diameter D2.21 is basically consistent with the actual visual inspection, the coil diameter calculation is correct. H0.11 is the parameter for VFD (Variable-frequency Drive) to perform internal calculation and adjustment frequency, D2.21 to H0. 11 has a roll diameter detection time H0.16, the size of H0.16 can be adjusted appropriately to make the H0.11 roll diameter follow D2.21 stable and the response time is appropriate. There is a formula for the relationship between roll diameter and frequency: line speed (V)∝frequency (F)×roll