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the control circuit of the common electric motor(2)

2016-09-03 09:59  
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the control circuit of the common electric motor(2)
The main circuit of the electric motor consists of Q,FU,the normally open main contact KM1 of KM and thermoelement of the thermal relay KR.The control circuit consists of S,KM,KA1,KA2 and the normally closed contact of KR.When you want to start it,the knife switches need to get through.When S is pressed,KA1 is conducted to pull in.The normally open contacts KAI-1 and KAI-3 get through.The normally closed contact KAI-2 is disconnected.KM is conducted to pull in.The normally open main contact KM1 and the normally open auxiliary contact KM3 and KM4 are connected.M starts to work.When S is disconnected.KA1 is released.KM stays pull-in as the contact KM4 is working.You can press S again when you want to stop it,KA2 is conducted to pull in.The normally open contact KA2-2 is connected.The normally closed contact KA2-1 and KA2-3 are disconnected.KM is released.M stops working.