| 摘要 |
A position control system for elevators including a plurality of pulse encoders which independently generate pulse signals in accordance with the movement of a cage. The pulse signals are respectively counted, and the operation of the cage is terminated when a difference in counted results between the encoders has exceeded a predetermined value. Thus, the cage can continue to operate even if there is a small difference between the counted results, and, when any of the pulse encoders malfunction, which triggers a substantially larger difference in counted results, the cage is controlled to stop the operation. |
