该方案简单实用，且对其它机床继电器接触器控制系统的改造具有一定的参考价值。
This system is simple, practical and has also reference value to the reformation of relay control system of other machine.
使用继电器、接触器、按钮、空气开关、行程开关等低压电器构成的控制电路称为继电接触控制电路。
Use relays, contactor, button, air switch and travel switch etc low-voltage constitute control circuit called relay contact control circuit.
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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