所有带接触器的控制回路均有引至现场控制按钮的控制电缆。
All control circuits with contactor shall be provided with control cables connected to site control buttons.
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.
在现代机床电气系统中，保压回路的控制方式可以通过继电器——接触器控制和可编程控制器PLC实现。
In electronic systems of modern machine tool, the control way of circuits of keeping pressure is able to be completed by the relay - toucher and the PLC.
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