How to transform the relay contactor control for PLC control system -

1,Y - Delta step-down start Y of the three-phase asynchronous motor control Delta step-down start of the relay contactor control for PLC control system.

PLC input signal: start button SB1, SB2 stop button, thermal relay normally open contact FR.

PLC output signals: main contactor KM1, Y contactor KM2, delta contactor KM3.

( 一) Main circuit

b） PLC I/O wiring diagram

Y - motor Delta step-down start wiring diagram of the

2) Design three-phase asynchronous motor of Y - Delta step-down start the ladder diagram

Y - motor Delta step-down starting control ladder diagram 2, series of autotransformer step-down starting control

will string of autotransformer step-down start relay contactor control for PLC control system:

1) Determine the I/O signals, draw PLC external wiring diagram

PLC input signal: start button SB1, stop button SB2, thermal relay normally open contact FR.

PLC output signals: run contactor KM2, concatenated autotransformer contactor KM1.

( 一) Main circuit

b） PLC I/O wiring diagram

motor autotransformer step-down start wiring diagram ( 2) Design three-phase asynchronous motor series of autotransformer step-down start ladder diagram

string of autotransformer step-down starting of three-phase asynchronous motor control ladder diagram

2, three-phase wound rotor asynchronous motor control

1, the series resistor startup control will wound rotor induction motor series resistance start relay contactor control for PLC control system.

( 1) Determine the I/O signals, draw PLC external wiring diagram

PLC input signal: start button SB1, stop button SB2, thermal relay normally open contact FR.

PLC output signals: power contactor KM, short answer the R1 contactor KM1, short answer the R2 contactor KM2, short answer the R3 contactor KM3.

( 一) Main circuit

b） PLC I/O wiring diagram

three-phase wound rotor asynchronous motor series resistance start wiring diagram ( 2) Design three-phase wound rotor asynchronous motor series resistance to start the ladder diagram

three-phase wound rotor asynchronous motor series resistor startup ladder diagram 2, series of frequency-sensitive rheostat starting circuit will wound rotor asynchronous motor series of frequency-sensitive rheostat starting relay contactor control circuit modification for PLC controller control system.

( 1) Determine the I/O signals, draw PLC external wiring diagram

PLC input signal: start button SB1, stop button SB2, thermal relay normally open contact FR.

PLC output signals: run contactor KM1, sub frequency-sensitive rheostat contactor, thermal relay access to the intermediate relay KM2 KA.

( 一) Main circuit

b） PLC I/O wiring diagram

three-phase wound rotor asynchronous motor series of frequency-sensitive rheostat starting wiring diagram ( 2) Design three-phase wound rotor asynchronous motor series of frequency-sensitive rheostat starting ladder diagram

three-phase wound rotor asynchronous motor series of frequency-sensitive rheostat starting ladder diagram

three

1 back and forth, automatic control, automatic control will automatically back and forth between control relay contactor control circuit modification of PLC control system.

( 1) Determine the external wiring diagram of PLC controller I/O signals, painting

PLC input signal: forward start button SB1, reverse start button SB2, stop button SB3, thermal relay normally open contact FR, positive limit switch forward SQ1, reverse backward limit switch for SQ2, forward extreme limit switch SQ3, backward SQ4 extreme limit switch.

PLC output signals: forward run contactor KM1, reverse run contactor KM2.

( a) Main circuit

b) PLC I/O wiring diagram

automatic control wiring diagram (back and forth 2) Design of ladder diagram

automatically to control ladder diagram

four, ladder diagram of experience design method

1, the characteristics of the trapezoidal diagram of PLC control system

2, experience design method of programming using the example above is 'experience design method. As the name suggests, the 'empirical method' is in accordance with the Ju the designer's experience to carry on the design method. 'Empirical method' programming steps

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