The electrical control system of printing and dyeing stenter machine was summarized. The system adopted advanced Siemens Profibus-DP fieldbus communication technology which equipped with Danfoss FC302 frequency converter to form a speed closed-loop control mode. By using the signal cascade output mode, the speed synchronization between the transmission units was realized, and the real-time performance and accuracy of the speed signal were improved. In addition, the Modbus fieldbus communication mode adopted by fan frequency converter and temperature control meter is also introduced, which realized better equipment data integration and data exchange.
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