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...International journal of control theory and applications issn science press volume number plc based star delta starter for three phase squirrel cage induction motor a sathish kumar s swathi p mallikarjuna sarma sridhar aelectrical electronics engineering department institute aeronautical hyderabad india e mail satishkumaralladi gmail com sridharp abstract this paper describes the importance limiting starting current torque at there are different methods however method with programmable logic controller is proposed in to start during time main contactors remain closed complete circuit connected mode voltage applied reduced line across each winding hence decreases when attains rotational speed approximately say full rpm after few seconds timer disconnects contactor rst then connects helps run load without any dif culty process management controlling function depending on output will get energised hardware set up using implemented exibility ef cient controllability effective automation ke...