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Communication Method between Elevator Main Controller and Call Plate [Invention]

Through the dynamic encryption technology of elevator main control panel and elevator outer calling panel, this patent can effectively prevent the elevator outer calling panel from breaking.

Elevator Group Control System [Invention]

This patent makes communication of elevator group control system more secure and reliable by redundant backup of communication signal of elevator group control panel.

Escalator automatic speed regulation method [invention]

This patent automatically adjusts the operating speed of escalator according to the load when it is going up, and intelligently switches power frequency according to bus voltage when it is going down.It can improve the energy-saving utilization of the escalator and greatly reduce the frequency conversion switching times, which is conducive to extending the life of the contactor.