the circuit of the multifunctional protector for electric motor(2)

Published:2011/6/23 6:12:00 Author:Ariel Wang | Keyword: multifunctional protector , electric motor | From:SeekIC

When there is phase lacking in L1 and L2,the current of L3 will increase rapidly(about 1.73 times normal current).The induced voltage of TA's winding on W2 is increased.The voltage of IC's pin-6 is higher than 2Vcc/3.The high level of pin-3 becomes low level.K is pulled in.The normally closed contacts are disconnected.KM is released as it is power down.The working voltage of electric motor M is cut off by the normally open contacts KM1～KM4.If there's phase lacking in L3,there will be no the induced voltage from TA.It is similar as the low level goes to pin-4 of IC .Pin-3 of IC outputs low level.K is pulled in.KM is released.Electric motor M stops working.



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