GE IC697BEM731

 

GE IC697BEM731

 

3、自动控制系统可靠性的提高途径

1）自动控制系统方案的选择

在选择方案时，应考虑尽量减少控制元件数、接点数和焊点数，以降低系统的失效率。采用可编程控制器（PC）来代替由继电器等组成的控制柜可以提高系统的可靠性。在比较可编程序控制器和继电器控制柜两种方案时，除了购置价格以外，还应充分估计前者在提高可靠性、缩短开发周期和减小工作量以及节省维修时间等有利因素。

2）控制元件的选用

正确选用控制元件的品种、规格是提高元件使用可靠性的关键。为此必须深入确切地了解和分析机床对电气控制系统的要求和系统对控制元件的要求。并且收集和消化控制元件制造厂提供的技术材料，如果这些资料不能满足选用的要求时，机床制造厂可按实际使用的条件对控制元件进行试验以确定是否合用。由于选用不当影响可靠性的例子有：忽视输入或输出的机械参数，例如选电磁铁时未考虑所拖负载的力――行程特性，选限位开关时未考虑撞块速度；选接触器时未考虑点动、反接制动的工作方式；选继电器时未考虑能做到可靠接触的额定最低工作电压和额定最小工作电流；选短路保护电器（包括熔断器）时未考虑对接触器等触头的保护；选控制变压器时未考虑漏阻抗在电磁系统起动电流情况下的压降等。

3）控制元件的工作环境

工作环境对可靠性有很大的影响。尘埃不但会引起电接触故障，而且可以降低绝缘性能、增加交流磁系统极面粘住的危险，因此必须采用必要的防尘措施。对于对可靠性要求较高的系统，控制元件应装入尘埃不能侵人的罩壳或电柜内。机床上的控制元件常工作在有润滑油或切削油的地方，这时必须选用防油型电器或采取防油措施。

 

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