再就是交流接触器工作噪声大，耗电多，线圈易烧坏等等。
It is big to exchange exactly the contactor work noise again, it is many to consume the electricity, and the coil is easily burnt out.
把任一个控制手柄拨到工作位置上，再按“起动”按钮，总接触器应不动作，则说明零位保护已发挥作用。
Put any control handle to the working position, press the "start" button, the total contactor should not move, then explain the zero position protection has played a role.
详细分析了交流接触器在不同使用条件下的闭合与分断时触点两端电压与回路电流情况，并研究了AC1～AC4工作制下的控制时序。
The conditions of voltage between contactors and current in main circuit under different using types are analyzed in detail, then designed the control sequences with working mode AC1-AC4.
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