In some machine tool control circuits, the motor will be required to start in order, such as the spindle of some machine tools must work after the oil pump; So ourThree-phase asynchronous motorHow to work sequentially? How about its sequence control principle? belowMori machineXiaobian will give you a brief explanation.
Let's take a look at the following figure together, the contactor (KM1Control motorM1), contactor (KM2Control motorM2);Three-phase asynchronous motor(M1The circuit part of) is a typical start and stop control circuit, and our (M2A contactor is inserted into the motor control circuit in series (KM1) auxiliary normally open contact (KM1),So here you can see that the contactor (KM1) Action, motor (M1) Starting, contact (KM1) close; Control motorM2) contactor (KM2) can be connected. Such control is called interlocking, (KM1Contacts are also called interlocking contacts.
When the isolation switch (QS) Close, then operate the start button (SB2), coil (KM1Power on, main contact (KM1Switch on the three-phase power supply, then (M1)Three-phase asynchronous motorRunning work; Tandem inKM2Control circuitKM1Auxiliary contact is connected, press (SB4) switch, (KM2The coil will be energized, (KM2The main contact is connected to three-phase power supply, and the motor (M2) will run and work, here is the first start (M1Restart (M2) for sequential start control.
Sequential stop controlIs to add an interlock link to the control circuit, (KM2Auxiliary normally open contact of contactor (KM2) andThree-phase asynchronous motor(M1) Parking button (SB1) is in parallel state. In this case, press the stop button (SB3), motor (M2Will lose power and stop working. At (M2After the motor stops, (SB1Normally open contacts in parallel (KM2Disconnect, then use the stop button (SB1Make the motorM1) Stop to achieve first power failure motor (M2), then power off the motive (M1) sequence stop control.
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