Design on controller of magnetic controlled soft starting for middle-high voltage motor

PLC is used as a controller for the high-voltage motor magnetic controlled soft starting device generally. A single trigger board is required to produce trigger pulse, and a synchronous transformer is need also. It is the high cost and low reliability of the control device. A new controller of magnetic controlled soft starting for middle-high voltage is developed. Two low-performance CPU is used to improve the processor capacity and reduce hardware cost. Large plate of a circuit board structure was used to reduce the size of the controller. All input and output apply the optical coupler isolation, and output signal was tested cycle for the correctness to improve the reliability.