PLC control Three phase asynchronous motor Positive inversion

this is three phase asynchronous motor positive and reverse relay contactor control operation circuit

KM1 for the motor to run the AC contactor,KM2 for the motor reverse running AC contactor,SB2 is the positive turn button,SB3 to reverse the start button,SB1 for stop button,FR for thermal protection relay.

When the SB2 is pressed,KM1 coils pull,KM1 main contact closure,The motor begins to run forward,At the same time the KM1 auxiliary normally open contacts and the KM1 coil power pull,The positive continuous operation of the motor is realized,Press the stop button until SB1;On the contrary, when the SB3 is pressed,KM2 coils pull,KM2 main contact closure,The motor begins to run in reverse,At the same time the KM2 auxiliary normally open contacts and the KM2 coil attracting, the motor reverse continuous operation,Press the stop button until SB1;KM1, KM2 coil interlock to ensure that the power is not at the same time,The research of this task uses PLC to realize the positive and reverse PLC control of the three-phase asynchronous motor.

The external hardware output circuit using KM2, KM1 normally closed contacts to the mutual lock.

Program 1,

Start – protection – stop instructions

X002 series in forward running the branch normally closed contacts and Y001 normally closed contact, run in reverse branch X001 normally closed and Y000 series of normally closed contacts to realize the buttons and the contactor interlocking

Program 2,

Set / reset instructions

Program 3,

Stack operation instructions

Debugging

① input program.

②static debug When pressed forward the start button SB2, YO bright press the stop button SB1, Y0 off;
When you press the start button reverse SB3, Y1 bright, press the stop button SB1, Y1 off;
When you press the start button SB2 forward when, Y0 on, press the start button SB3 when reversing, Y0 off, while Y1 bright, press the stop button SB1, Y1 off

③Dynamic debugging. When you press the forward button KM1, the SB2 is closed,

Press the reverse button to start SB3, KM1 off, while KM2 closed; press the stop button SB1, KM2 off