| 摘要 |
PURPOSE:To generate no large stopping shock, to realize a trade-off countermeasure to the closing operation speed of a main control valve, and to obtain a stable property, by making the operation speed of the main control valve variable according to the operating condition of an elevator. CONSTITUTION:A speed control circuit 102 provided to the control device 100 of a fluid pressure elevator converts the width and the frequency of the pulse output to the coil of a solenoid pilot valve SDH which controls a main control valve DV, according to the operating condition of the elevator, and the conditions whether it is a stop of the normal operation or an emergent stop, and the like. As a result, since the closing operation speed of the main control valve DV is increased, the operating speed is increased in a normal operation, the main control valve DV is closed up until an inverter control is cut off, and generation of a stopping shock is prevented. An in an emergent stop, the closing operation speed of the main control valve DV is reduced so as to reduce the shock. |
