PLC how to realize the control of the two alternating electric motor running? - - - - - -

PLC being is how to realize the control of the two alternating electric motor running?

two alternating electric motor running is refers to the motor M1 operation after a certain time automatic stop, motor M2 began to work, when the motor M2 operation after a certain time automatic stop, motor M1 started running again, so repeated cycle, to realize the automatic alternating operation of two electric motors.

graph: two electric motors alternate operation of the PLC control circuit

combining PLC external components and main circuit of the control relationship, and I/O address allocation table, two electric motors alternate operation control process is as follows: 1.

Motor starting control process of M1

starting motor M1, can be controlled by button SB1.

graph: motor starting control process of M1

2. M1 stop of the motor and motor starting control process of M2

graph: M1 stop of the motor and motor M2 starting control process

3. M1 and M2 stop of the motor and motor starting the control process of

graph: M1 M2 stop of the motor and motor starting control process again

when need two electric motors stop running, press the stop button SB2, input relays normally closed contact of the PLC program '. 1 '0', namely the normally closed contact I0. 1 disconnect, auxiliary relay M0. 0 coil, losing electricity contact reset, timer relay Q0 T37, T38 and output. 0,。 A coil are losing electricity, the control of PLC external motor contactor coil electricity, drive the primary contact reset in the main circuit disconnect, cut off the motor power, motor stop cycle.

PLC being is how to realize the control of the three-phase ac motor decompression starter?

three-phase ac motor decompression starter refers to using small starting current, when the phone is switched on in order to avoid the impact of the instantaneous large current of motor starting, then under PLC control is converted into a running total pressure.

diagram: a three-phase ac motor decompression starter PLC control circuit

table: the three-phase ac motor decompression starting control PLC ladder diagram of I/O address allocation table ( Siemens S7 - The 200 series PLC)

combining PLC external components and main circuit of control relations, the I/O address allocation table, understand the three-phase ac motor decompression starting control process. Close the power master switch QS, press the start button SB1 decompression, total pressure start button SB2, three-phase ac motor run from low voltage starting to full pressure control process as shown in the figure below.

diagram: a three-phase ac motor from the control process of low voltage starting to run full pressure

when need three-phase ac asynchronous motor stalling, press the stop button SB3. The I0 within the PLC. 3 '0', namely the off contact, output Q0 relay coil. 0,。 1 loss report. Normally open contacts Q0. 0,。 1 reset disconnect, lifting the lock; PLC external ac contactor coil KM1, KM2 lost electricity. The primary contact KM1 - in the main circuit 1平方公里, 1 reset disconnect, cut off the motor power, motor to stop running.

PLC controller being is how to realize the three-phase ac motor Y - Delta decompression starting control?

Y - three-phase ac motor Delta decompression starting control refers to the three phase of large capacity motor starting when the winding connection Y step-down starting in the first place, then through controlling circuit will change its winding to delta connection and implement total pressure control mode of operation.

graph: Y - three-phase ac motor Delta decompression starter PLC control circuit

table: Y - three-phase ac motor Delta decompression starting control PLC ladder diagram of I/O address allocation table ( Siemens S7 - The 200 series PLC)

the connection mode of three-phase ac motor (mainly include star connection Y） And delta connection ( Delta) One of two ways. For pick up in the power supply voltage of 380 v motor, when star motor coupling, motor each phase winding withstand voltage of 220 v; When the motor adopts delta connection, each motor phase winding withstand voltage of 380 v.

graph: Y of the three-phase winding of the motor and delta connection

combining PLC external components and main circuit of control relations, the I/O address allocation table, understand the motor - Y Delta decompression starting control process.

1。 Three-phase ac motor Y - The control process of delta decompression starting

graph: the control process of decompression starting three-phase ac motor Y connection

graph: three-phase ac motor winding automatically converted to the control process of delta connection operation

2. The control process of three-phase ac motor stop

graph: the control process of three-phase ac motor stalling

PLC being is how to realize the three-phase ac motor starting and reverse connect braking resistor reduced pressure control?

three-phase ac motor concatenated starting and reverse connect braking resistor decompression PLC control circuit mainly realize the three-phase ac motor starting when the series resistor decompression starter, when stop by winding commutation reverse connect braking.

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