Author: Chengdu Wang Xinghui
First, application background
With the gradual development of industrial automation, automation has been widely used in various manufacturing industries and enterprises. In many of today's foaming machine control systems, in order to simplify the mechanical structure and reduce the maintenance costs of the equipment, it is required to synchronously control the speeds of multiple motors of the equipment. Using Haiwell's powerful, easy-to-use logic functions make it easy to synchronize multiple motors. Here's an introduction to this application.
Second, application requirements
The project requirement is to realize five-step independent conveyor belts with high-speed and low-speed synchronous control through PLC and inverter. With the automatic stop function in place, the purpose of positive and negative motor control can be achieved.
Third, the solution
The project mainly includes 1 to 5 sections of conveyor belts, drive motors, inverters, PLCs and other components. Frequency conversion speed regulation is adopted to drive the conveyor belt. The entire system is coordinated by PLC and frequency converter to realize multi-speed control selected according to various speed requirements for conveying different materials. According to the design requirements, photoelectric sensors are used to detect the material and the signal is transmitted to the PLC. In turn, the inverter drives a motor to drive the conveyor belt and deliver it according to the given frequency. The start signal of the inverter is given by the PLC output, and the speed control of the inverter is achieved through two-stage speed control.
Fourth, hardware configuration
Figure 1 Sea is PLC C60S2R
Figure 2 Equipment internal components
Figure 3 The complete picture of the device
Fifth, software design
Figure 4 start stop control output program
Figure 5 high and low speed switching program
Figure 6 control output program
Sixth, concluding remarks
Using domestic Haiwell PLC's perfect special command functions, it can realize the speed synchronous control of the equipment quickly and accurately. Can be widely used in paper machine equipment control, long conveyor chain, long conveyor line and other requirements of multiple motor speed synchronous control of the occasion.
Due to adopting the sea as the PLC, the programming is simple, the cost is low, and the system is stable and reliable, so that the end user is very satisfied with the system.
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