Press the start switch SB2, KM1 suction and self-locking, at the same time KM3 suction, KT began to energize the timing; at this time, the motor for the star starter state. kt time, its normally closed contacts disconnect the KM3 coil, KM3 reset its normally closed point is also reset, coupled with the KT has been timed to ? Normally open contact connected to make the KM2 coil power, KM2 normally open contact self-locking, short KT normally open contact, KM2 normally closed contact disconnect KT coil? also disconnect the coil of KM3 at the same time; at this time, switch to the triangular operation state. normally closed contacts of KM2?and KM3? Realize interlock control, FR realize overload stop, press the stop switch SB1, the whole control line power-off reset.
program part, please refer to my space in the personal diary (Y / △ buck start program and relay line control), with the Mitsubishi PLC program, their own change to Siemens program, the analysis is similar. /442407176?ADUIN=499737079&ADSESSION=1324903174&ADTAG=CLIENT.QQ.3307_FriendTip.0&ptlang=2052