当达到额定转速后，控制系统需要一个无压降连接(压缩机运行)，在这种状态下接触器必须闭合。
After reaching the rated speed, a potential-free contact (compressor running) is required for control system. The contact must be closed in this state.
双电磁系统控制电路确保两台并联接触器的同步闭合和无声节电运行。
Its control circuit with double electromagnetic system can ensure synchronous closing, silent and energy saving operation of two contactors in parallel.
按下“开启”或“闭合”按纽，幕体到达行程终止位置时，行程终止开关将被激活时，大幕机停止运行。
Press "Open" or "Close" button, while reaching stop position, stop switch will be activated and the proscenium curtain machine will stop running.
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