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1. The situation on the spot:
On-site machinery and equipment: roll paper slitting machine
V&T Inverter Model: Main Unit V5−H−4T 7.5G/11L, Winding Machine V6−T−4T 11−T0
Motor nameplate parameters:
Main motor rated power 7.5kW, rated speed 1440 rpm, rated current 15.4A, basic operating frequency 50HZ
The rated power of the upper and lower shaft motors is 11kW, the rated speed is 1440 rpm, the rated current is 22.2A, and the basic operating frequency is 50HZ.
2. The system wiring diagram:
3. The system program:
The system winding inverter and encoder are used for closed-loop control to improve the control speed accuracy. The wiring is shown in the figure above.
Here is a formula: tension (F) * roll diameter (D / 2) = torque (T)
The system adopts a host to drive the paper products. The raw material paper reel on the front stage of the main machine has a brake air valve to avoid the material reel flying. The material passes through the cutting blade and cuts the paper into the same width sample paper. The take-up reel then receives the pattern on the reel. A picture of the on-site rewinding material can be found in the following figures.
The main machine is a 7.5 kW inverter for main tension and transmission, X1 terminal for start and stop setting, AO1 output front speed for winding inverter, AI1 analog channel for line speed reference, adjustment potentiometer can change host operation speed. The specific terminal wiring diagram is shown in the figure above.
The winder is two 11kW inverters, and the winding motor and encoder are used to improve the speed control accuracy. The winding system realizes constant tension control in the torque control mode. The AI1 input speed limit command, that is, the front speed limit command, the AI2 input tension reference command, the X1 terminal is used as the running stop command, and the X2 terminal is used for the roll diameter reset.
Here is a detailed description of how the winder achieves constant tension control: First, we must understand that the tension command given by AI2 is force F? Or torque T? For general torque control, set the function code Pd.00=1 (H1.00=0), the torque (T) is given by the analog channel AI, and the tension becomes larger as the winding diameter becomes larger during production. (F) will become smaller. However, we apply the torque control mode here, that is, H1.00=1, so the inverter is controlled by the AI2 channel to control the output F of the motor, that is, the tension (F) in the above formula is given. In paper production, when the tension is constant by the potentiometer, the tension of the paper is consistent, and then the speed of the front stage is increased. As more and more rewinding paper is rolled, the winding diameter is also larger and larger. In order to accurately calculate the value of the coil diameter, the output torque can be increased, and the inverter DSP will automatically issue the command. When the coil diameter becomes larger, the torque is proportional to the coil diameter to ensure the winding tension (F). ) Constant. Whether the diameter calculation is correct here is the key to control.
In this system, the winding diameter is calculated accurately, the delivery process is stable, and the speed of the delivery is kept in sync with the speed of the front stage. The winding paper is neat and the degree of tightness is consistent. It can meet the needs of customers' production and is recognized by customers.
4. The function code settings:
Firstly, the motor parameters are rotated and self-tuning. It is necessary to remove the belt on the motor, set P0.15=basic running frequency, P9.02=motor rated speed, P9.03=motor rated power, P9.04=motor rated current, P9 .15=2, start the inverter, the keyboard displays “-AT—” for rotation auto-tuning.
Winding inverter function code parameter setting:
P0.03=8, P0.04=1, P0.06=1, P0.08=6, P0.09=20, P2.02=3Ebd, P5.00=2, P5.01=32, P6. 21=0048, Pd.00=1, H0.00=1, H0.04=320 (maximum line speed in the field), H0.05=3 (field minimum line speed), H0.06=2.5, H0.07= 750, H0.08=90, H0.09=90, H0.10=90, H0.16=0.1 (for coil diameter detection time, depending on site conditions), H1.00=1, H1.01= 01, H1.02=1000 (for maximum tension setting, according to site conditions), H1.08=700 (for field material density), H1.09=1830 (for material width, according to the width required for production cutting), H1.12=1024 (number of pulses per revolution of the encoder), H1.13=encoder direction (after setting one direction, you can press the keyboard to jog. If the current is too large, the motor shakes sharply, then change the direction) , H2.13=1, H2.14=1 or 8
Host inverter function code parameter setting:
P0.04=1, P0.08=6, P0.09=30, P0.16=2.6, P5.00=2, P6.00=4440, P6.01=0.4, P7.02=9, P7. 04=48, PA.09=1
After setting the above function code parameters, it can realize the constant tension control of the winding inverter following the previous stage speed, and the effect of winding the paper sample is good, which satisfies the production demand.
To do the diameter calculation, the first thing the debugger needs to do at the scene is to figure out several important parameters. Q: H0.04 = maximum line speed, H0.05 = minimum line speed, H0.07 = full volume setting, H0.08 = empty volume setting, H1.08 = material density (can not be asked, you can estimate by yourself), H1.09 = material width, H0.06 = transmission ratio (can not be asked, you can measure it yourself).
When doing the winding diameter calculation debugging parameters, always observe the change of H0.11 during operation, contact d2.21=actually calculate the winding diameter, then visually measure the winding diameter of the paper winding, estimate the diameter of the winding, and see the d2.21 display. Whether the value is consistent with the visual estimate. If d2.21 is too large, set the maximum linear velocity H0.04 to be too large. You can change H0.04 to a small point, and then observe the numerical display, and then modify the corresponding parameters. D2.21 calculates the actual coil diameter for the inverter, and passes the H0.16 coil diameter detection time. The value of d2.21 will be excessive to H0.11. H0.11 is the reference data for the inverter to change the torque output. H0.16 roll diameter detection time can get better control effect.
During the debugging process, observe how much the analog voltage display of the winding inverter AI1 and AI2 is displayed, and observe whether the AI1 speed limited analog display is consistent with the previous operating frequency.
6. The scene photo:
When running at full speed of 50HZ, the upper and lower rolls respectively receive a roll of paper stock, and the rolled paper is neat and tight.
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