| 摘要 |
PROBLEM TO BE SOLVED: To provide a switch which further improves reliability by grasping appropriate exchange timing by detecting a wear progress of a gear train even if the switch comprises a closing spring compression mechanism.SOLUTION: The switch comprises a spring manipulator with a closing spring and a breaking spring as a drive source for opening or closing a movable contact relatively to a stationary contact. The switch also comprises a wear monitoring device including: a measurement part which measures, for each time the movable contact and the stationary contact are opened or closed, a current of a motor for driving a gear train including a small gear and a large gear which are rotated by transmitting a driving force of the motor thereto; a diagnosis part for calculating the number of times of opening or closing the movable contact and the stationary contact (the number of times of manipulation) and a maximum current value of the motor based on information that has been measured by the measurement part; and a discrimination part for discriminating the wear progress of the gear train based on the maximum current value of the motor corresponding to the number of times of opening or closing the movable contact and the stationary contact (the number of times of manipulation) that has been calculated by the diagnosis part.SELECTED DRAWING: Figure 5 |
