This article, written by Mo Changliang of Shenzhen Steptech Technology Co., Ltd., discusses the performance characteristics and advantages of using communication-controlled servo systems in pharmaceutical packaging equipment, taking the application of servo systems in aluminum-plastic blister packaging machines as an example. 1. Introduction With the continuous improvement of hygiene requirements for pharmaceuticals, pharmaceutical packaging equipment has made significant progress in terms of hygiene, packaging speed, automation, humanization, and electrification. Shenzhen Steptech Technology Co., Ltd. provides a highly competitive solution for a pharmaceutical machinery manufacturer using its independently developed EVIEW touchscreen and KINCO intelligent servo system. This article mainly introduces the application of the KINCO intelligent servo system. 2. Blister Packaging Machine Process The equipment diagram is shown in Figure 1. [IMG=Figure 1 Equipment Outline Diagram]/uploadpic/THESIS/2007/11/2007111616013251989S.jpg[/IMG] Figure 1 Equipment Outline Diagram. The old transmission part structure diagram of the equipment is shown in Figure 2. [IMG=Figure 2 Cam-based Transmission Structure]/uploadpic/THESIS/2007/11/2007111616021072083F.jpg[/IMG] Figure 2 Cam-based Transmission Structure [IMG=Figure 3 Transmission Structure Using Servo System]/uploadpic/THESIS/2007/11/2007111616034458432Y.jpg[/IMG] Figure 3 Transmission Structure Using Servo System Figure 4 Motion Process: With each rotation of the frequency converter motor, the mechanical cam drives the mechanical film-pulling device to pull the plastic film backward a certain distance. The film-pulling position error must be <±0.2mm, and the cumulative error over 20 pulls must also meet <±0.2mm. The mechanical effect basically meets the process requirements, but because the pulling length of the mechanical cam cannot be changed, when the film-pressing mold changes, the mechanical cam must also be changed, reducing production efficiency. Moreover, with the continuous improvement of packaging industry requirements, color mark fixed length method is adopted in many occasions to eliminate cumulative error. However, the color mark fixed length method cannot be used to eliminate cumulative error on mechanical cams. For this reason, servo system has come to the stage. MT506 touch screen controls and modifies the internal parameters of Twido PLC, and then uses PLC to control servo I/O and modify servo motion parameters. The color mark signal is directly connected to the servo driver to control the stop of servo motor. The motion curve of servo is shown in Figure 5. [IMG=Figure 5 Speed ​​Curve]/uploadpic/THESIS/2007/11/2007111616040193605G.jpg[/IMG] Figure 5 Speed ​​Curve 3 The main reasons for using Kinco servo (1) Twido PLC pulse function is not strong. In many large or medium-sized PLCs, in order to improve the PLC's operation speed, the high-speed pulse output function is modularized. There is often no high-speed pulse output port on the CPU module of PLC. Kinco servo has intelligent function and can drive the motor without external pulse. (2) During the operation of the equipment, the high-speed pulses output by the PLC were subjected to electrical interference due to the start-up of some interference sources, causing the servo in the original system to malfunction. Interference is a very troublesome thing in the field environment. When designing the system, the intermediate links should be minimized as much as possible, and the motion curve of the motor should be realized by using the Seq programming function in the Kinco driver, thereby reducing the interference caused by external pulses during transmission. (3) In order to make the positioning of the equipment more accurate, the servo system should respond to the color mark signal faster. The original system inputs the color mark signal into the PLC and then lets the PLC control the servo to stop. However, the ordinary PLC running cycle is generally about 20ms, while this system has a running cycle of 50ms because of the large number of programs. Then the error of color mark positioning is too large to be acceptable. Using the fast capture input port of Kinco servo to detect the color mark signal can increase the response time to the color mark to 64us, thereby greatly improving the positioning accuracy of the servo motor. The positioning accuracy of the entire electrical part of the system is basically within 0.1ms. 4. Conclusion With the continuous development of packaging machinery requirements and the increasing demands for efficiency, servo motors are increasingly used in the packaging of solid pharmaceuticals and food, as well as in liquid bagging equipment. The process primarily employs servo fixed-length control or color-mark fixed-length control. Furthermore, the selection of Kinco servo motors reveals that their communication control functions, rapid capture functions, and internal sequence programming capabilities play an irreplaceable role compared to traditional pulse servos in some large-scale equipment. (Proceedings of the 2nd Servo and Motion Control Forum; Proceedings of the 3rd Servo and Motion Control Forum)