[Abstract] This article mainly introduces the application of Delta C2000 frequency converter in a felt cutting and packaging machine.
【Abstract】This paper mainly introduces application of Delta C2000 inverter in felt cutting and packing machine.
[Keywords] C2000; single-point positioning; torque control; pulse follower control
【Keywords】C2000; point positioning; torque control; pulse tracking control
The tar paper cutting and packaging machine is used to cut and simply package tar paper. It is a relatively complex machine involving positioning and tension control. The Delta C2000 series frequency converter integrates control, drive, and communication into one unit, combining functions such as master station, control, bus, flying shear, and protection, thus effectively fulfilling this control requirement. The basic features of the C2000 frequency converter include:
1) Fast communication speed: Built-in CANopen fieldbus and MODBUS, with a variety of communication modules available for purchase, suitable for large-scale engineering projects.
2) Diverse control options: Three control modes including speed, torque, and position; standard LCD, optional LED. Through-wall installation enhances system protection.
3) Cost and space saving: Built-in 10K capacity PLC, can be used as CANopen master station, integrated control of induction motor and synchronous motor, higher efficiency and energy saving.
4) Extremely strong overload capacity: Rated output current for general load: 120% for 1 minute; Rated output current for heavy load: 150% for 1 minute.
5) Stable and energy-saving operation: Built-in DC reactor (≥37kW) and braking unit (≤30kW), DC-BUS DC bus can be connected in parallel and shared.
Figure 1. Oil felt cutting and packaging machine
1. Working process of the tar paper cutting and packaging machine
First, the take-up roller completes the origin positioning and is ready to wind up the tar paper (the purpose of positioning is to align the notch with the fed tar paper so that it can be fixed after entering).
Secondly, the take-up roller winds up the oil felt under tension control. During this process, the encoder on the feed roller feeds back a position signal to the PLC to determine the length of the oil felt that has been fed. Once the specified length is reached, the PLC issues a stop command, and the take-up roller stops.
Finally, the cutter cuts the asphalt felt, and then the take-up roller starts again to continue winding up the remaining asphalt felt. This process uses pulse follow control, and then the asphalt felt is packaged.
2. Inverter Control Mode
2.1 Single-point positioning
In FOCPG mode, a position is preset (parameter 10-19), an MI point is defined as a single-point positioning function (d35), and an MO point is defined as a position arrival (d39). When this MI point is triggered during the operation of the frequency converter, the frequency converter starts to perform single-point positioning and finally stops at the specified point, while triggering the MO point to ON.
Figure 2 Single-point positioning control chart
2.2 Pulse Follower Control
In FOCPG mode, an MI point is defined as pulse follower function (d37) and an MO point is defined as position arrival (d39). After receiving the pulse command, the inverter starts to accelerate to the pulse frequency. After the pulse is sent, the inverter starts to decelerate and continues to complete the number of pulses that have not been completed until it stops. Then the MO point is triggered to ON.
Figure 3. Position control diagram of the entire pulse command process.
3 Torque Control
Define the control mode as torque control.
To switch from speed mode to torque mode, you can modify 00-10=2 via communication or define an MI point for TQC/FOC switching function (d26, also need to set 11-42=1).
When starting in torque mode, the inverter runs to the target torque or speed limit according to the torque command (11-34).
4. Main parameters
After completing self-learning and inertia testing, the main parameters are set as shown in Table 1.
Table 1 Main parameters of frequency converter
5. Debugging Steps
The debugging process mainly consists of the following steps: First, motor self-learning: set motor parameters and perform dynamic or static self-learning; second, perform inertia testing, including: setting encoder parameters; setting 00-11=3; setting acceleration and deceleration times 01-12 and 01-13 (as short as possible); setting 11-00=2 and F=33; running in both forward and reverse directions until 11-01 changes little, then setting 11-00=1.
Third, set the relevant parameters for the single-point positioning function: 02-05=35, 10-19=0 and other parameters, and test whether the single-point positioning function is normal.
Fourth, set the relevant parameters for the pulse follower function: 02-06=37, 10-16=3 and other parameters, and test whether the pulse follower function is normal.
Fifth, set the relevant parameters for the torque control function: 02-04=26, 11-33=2, 11-36=1, 03-01=2, 11-42=1 and other parameters, and test whether the torque control is normal.
It is important to note that the debugging process is based on FOCPG mode, therefore, it is essential to ensure that FOCPG mode is functioning correctly; at the same time, attention should be paid to preventing interference issues.
6. Conclusion
The Delta C2000 is a general-purpose frequency converter with comprehensive functions, capable of both speed and torque control, as well as positioning and position control. This greatly promotes the application of the C2000 frequency converter in the cutting and packaging industry.
Through testing, the Delta C2000 successfully controlled the take-up rollers, meeting customer requirements. The C2000 offers excellent control performance and reduces costs compared to servo control; its inverter power range is wider than that of a servo, allowing it to be used with higher power loads; this application solution has significant potential for wider adoption and can be extended to the cutting and packaging of other similar products.
About the author:
Mao Mingchuan, male, born in 1986, graduated from Nanjing University of Aeronautics and Astronautics with a major in Electronic Information Science and Technology. He is currently an Application Engineer in the Inverter Product Department of Delta Electronics Group - Delta Electronics Technology Co., Ltd., where he is engaged in the application and promotion of inverter products in the SI (System Integration) industry and has many years of industry experience.
