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目前,国内外对客货两用施工升降机(施工电梯)超载运行,多采用电流型的热继电器来切断电源的控制方法。该法不但控制时间滞后,且控制精度也较低,只适用于起动特性较软的电动机。瑞典ALIMAK公司生产的升降机,当其超载25%时,即不能起动,起动时间延时,导致热继电器动作,断开电源。此法对国内某些机型是不适用的。还有些电动机的起动转矩超过额定转矩的3.5倍,由它拖动的升降机适于设置载荷控制器。我们研制的SC-100型载荷控制器能够
At present, domestic and foreign passenger and cargo dual-use construction elevators (construction elevators) are overloaded, and current-type thermal relays are often used to cut off power supply control methods. This method not only controls the time lag, but also has low control accuracy. It is only applicable to motors with soft starting characteristics. Lifts produced by the Swedish company ALIMAK, when they are overloaded by 25%, cannot be started and the start-up time is delayed, causing the thermal relay to act and disconnect the power supply. This method is not applicable to certain domestic models. In addition, the starting torque of some motors exceeds 3.5 times of the rated torque, and the elevator driven by it is suitable for setting the load controller. The SC-100 load controller we developed can