| 摘要 |
PURPOSE:To safely and automatically switch and operate a motor by connecting the first and second starter circuits for respectively driving the first and second motors through an electro-optic converter, an optical fiber and a photoelectric converter. CONSTITUTION:A starter circuit 31 for driving a motor 32 and a starter circuit 33 for driving a motor 34 are provided, the current of the motor 32 is detected by a CT37, applied to an electro-optic converter 38, connected to a photoelectric converter 40 in the circuit 33 through an optical fiber 39, the current of a motor 34 is detected by a CT52, applied to an electro-optic converter 53, connected to a photoelectric converter 49 in a starter circuit 31 through an optical fiber 54, thereby controlling contacts 57, 43. Accordingly, when a breaker 36 or 51 of a motor is opened during operation, it can be automatically switched to other stopping motor, and since an optical device is used, a trouble such as an electric shock can be prevented. |
