FBM207B

FBM207B

FBM207B

1．步进阶梯设计

    按图1所示的控制流程，采用逐步得电逐步失电型顺序控制系统设计法设计的步进阶梯如图4a所示，其电路结构与图3的不同点之一是每步的失电由下一步辅助继电器的常闭接点控制；之二是步1回路必须串联步2至最后工作步4的辅助继电器常闭触点。以防电路工作时，因误操作再次起动而导致控制顺序错乱。其余的电路结与图3相同。

    2．输出阶梯设计输出阶梯如图4b所示，输出继电器的控制回路根据控制流程直观确定。例如，输出继电器Y1要求在步1、3得电，则将步1、3的辅助继电器M1、M3的常开触点并联，再与Y1的线圈串联即可。其余输出继电器的控制回路构成方法与此相同。

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