| 摘要 |
PURPOSE:To enhance the reliability of a system, by providing the respective output sides of a multiplex controller. With reverse-current-proof circuits, and by setting an abnormal state detection switching circuit to select a control system. CONSTITUTION:When an abnormal state in a System I is detected in an abnor mal state detection switching circuit 5 in a control System I/a stand-by System II, then the transistor of an inverter 1A-4 is turned OFF, and feed current to a motor is cut. After that, the gate of the thyristor of a reverse-current-proof circuit 4B in the System I is turned OFF. Then, by turning the gate of a thyris tor in a reverse-current-proof circuit 4B in the System II, ON, the System II is electrically connected to the motor side. An inverter 1B-4 in the System II is driven, and motor current is fed. |
