Press the start switch SB2, KM 1 attracts and locks itself, at the same time KM3 attracts and KT starts to be electrified. At this time, the motor is in a star-shaped starting state. When KT time is up, its normally closed contact disconnects KM3 coil. After KM3 is reset, its normally closed contact is also reset. Plus KT has been timed? Normally open contact is connected, K2 coil is energized, K2 normally open contact is self-locked, KT normally open contact is short-circuited, and K2 normally closed contact disconnects KT coil? At the same time, the coil of KM3 is disconnected; At this point, it switches to the triangle running state. KM2？ And KM3 normally closed contacts? Interlocking control is realized, and FR realizes overload shutdown. Press the stop switch SB 1, and the entire control line will be powered off and reset. ?

For the program, please refer to my personal diary (Y/△ step-down startup program compared with relay circuit). The Mitsubishi PLC program is changed to Siemens program, and the analysis is similar. /442407 176? ADUIN = 499737079 & ampampad session = 1324903 174 & amp； ADTAG = client. QQ . 3307 _ friendtip . 0 & amp； ptlang=2052