| 摘要 |
PURPOSE:To prevent the shock of an elevator cage due to the sharp variation of thrust caused by the abrupt output variation in the case where the roller of a speed detector is sprung up by the joint, etc., of a guide rail. CONSTITUTION:The estimated value of a speed detector is formed by subtracting the output which is obtained by differentiating the speed instruction value by a differentiating circuit 31, from the speed instruction value, and the estimated value is compared with the output of the speed detector, and when the value exceeds a specified allowable value set by an allowable width setting circuit 32, the output of the speed detector is not used for the speed calculation, and the estimated speed value is considered as the output of the speed detector, and used in the speed calculation. |
