Design three-phase asynchronous motor with logical method/delta Y step-down starting PLC ladder diagram

Design three-phase asynchronous motor with logical method/delta Y step-down starting control ladder diagram. 1) Clear control tasks and control the content of press the starting button SB1, time relay KT and priming contactor KMY electric coil, after the main contactor KM coil electricity and self-locking, Y starting. When KT delay arrival, KMY coil electricity, KM delta to coil at the same time, the complete Y starting motor, into the normal operation of delta form. In the process, press the stop button SB or thermal relay FR action, motor unconditionally stop. 2) Determine the soft components of PLC, draw the PLC controller external wiring diagram of PLC input signal: starting button SB1 ( X1) , stop button SB ( X0) , thermal relay FR (normally open contacts X2) 。 PLC output signals: main contactor KM ( Y0) Starting contactor, KMY ( Y1) , run the contactor KM delta ( Y2) 。 Timer ( T0) 。 According to the I/O signals, can draw the external wiring diagram of PLC controller is shown in figure 5. 3) List truth value table truth value table is according to the control requirements, the function and the contact list of coil variable values, namely when the coil function is 1, which must make contact variable to 1, when the winding function of 0, which must make contact variable to 0. For example, when priming contactor to 1, you must make the start button for 1 or starter contactor for 1; When priming contactor to 0, you must make the stop button or thermal relay or run or timer 0. According to the control requirements, can list its true value table, as shown in figure 6. Contact coil X0X1X2Y0Y1Y2T0Y1Y0Y2T01110000011100011100001011000 figure 6 Y/delta motor step-down starting truth table 4) Lists the logical function expression of the coil in the truth table function of 1 contact on the logical type and variable coil function of 0 the contact variables of variable, which is a logical expression of coil function, therefore, can be listed as follows the logical function expression: 5) Draw the ladder diagram according to the logical function expression and logic function expression and the corresponding relation of ladder diagram, can draw the ladder diagram is shown in figure 7. 6) Optimization of ladder diagram according to the ladder diagram shown in figure 7, can use auxiliary relay is optimized, as shown in figure 8.
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