1, timing automatic cycle control circuit Description: 1. The capacity of the three-phase asynchronous motor in the figure is 1.5KW. It is required that the circuit can automatically cycle forward and reverse rotation control; the forward rotation maintenance time is 20 seconds, and the reverse rotation maintenance time is 40 seconds. 2. Wiring on the power distribution board according to the schematic diagram requires clear lines, reasonable process and reliable contacts. 3. Briefly describe the working principle of the circuit. Note: The delay time of the time relay should not be less than 15 seconds, and the time adjustment should be from long to short. Timing automatic cycle control circuit circuit working principle: close the power switch QF, press the hold button SB2, the intermediate relay KA pulls in, the KA self-protection contact and the button SB2, KT1, KT2 power-off delay closed the break contact The series circuits are connected in parallel, and the start control circuit is turned on. Press the start button SB3, the time relay KT1 is energized, the moving contact KT1 whose power-off delay is open is closed, the coil of the contactor KM1 is energized, the main contact is closed, and the motor is rotating forward (the forward rotation is maintained for 20 seconds) Start). At the same time, the KM1 moving contact is connected to the time relay KT2, and the dynamic closing contact KT2 which is disconnected in the coil circuit of the contactor KM2 is closed, since the interlocking contact of KM1 is disconnected at this time, The contactor KM2 coil cannot be energized. When the forward rotation maintenance time is over, the moving contact KT1 that is turned off is turned off, KM1 is released, and the motor is stopped. KM1's breaking contact is closed, the contactor KM2 coil is energized, the main contact is closed, the motor starts to reverse. At the same time, the KM1 moving contact opens the time relay KT2 coil circuit (the reverse rotation time is 40 seconds to start) . At this time, the KM2 moving contact is connected to the KT1 coil again, and the moving contact KT1 with the power-off delay is closed to prepare for the next forward rotation of the motor. Therefore, the KM2 interlocking contact in series in the coil circuit of the contactor KM1 is disconnected, and the coil of the contactor KM1 is temporarily not energized. The KT1 and KT2 in series with the button SB2 are closed with a power-off delay to ensure that the control circuit can be restarted after the automatic cycle of the motor is completed. The thermal relay FR normally closed contact automatically disconnects the control circuit when the motor is overloaded or when the phase is overheated, protecting the motor. 2, sequential control circuit (example) The sequence control circuit (example) works: Figure A: The KM2 coil circuit is connected after the KM1 coil circuit is started and stopped. When the start button SB2 is pressed, the KM1 coil is electrically attracted and self-locked, and the KM2 coil circuit can be controlled at this time. The stop button SB3 can only control the stop of the M2 motor, and the stop button SB1 is the stop button. This circuit can only start the M2 motor if it meets the conditions for starting the M1 motor first. Figure B: The control circuit is composed of a KM1 coil circuit and a KM2 coil circuit. KM1's moving contact is used as a control condition, connected in series in the KM2 coil circuit. Only the KM1 coil is electrically connected, and its auxiliary group assists the closing contact to close. At this time, the KM2 coil circuit can be controlled. The stop button SB3 can only control the stop of the M2 motor, and the stop button SB1 is the stop button. This circuit can only start the M2 motor if it meets the conditions for starting the M1 motor first. 3, motor sequence control circuit Description: 1. The starting sequence of this circuit is the first M1 motor and the rear M2 motor; the stopping sequence is reversed. The working principle of the motor sequence control circuit: close the power switch QS, press the start button SB1, the contactor KM1 is energized and self-protected, and the M1 motor starts running. The other moving contact of the KM1 is closed to prepare the contactor KM2 for power. When the start button SB2 is pressed, the contactor KM2 is energized and self-protected, and the M2 motor is started. The starting sequence is first KM1 pull-in, M1 motor starts running; after KM2 pulls in, M2 motor starts running. The parking sequence is: first press button SB4 to make contactor KM2 power off, KM2's moving contact is disconnected, M2 motor stops and then press SB3, M1 motor can stop running. Thermal relays FR1, FR2 normally closed contacts, the control circuit is automatically disconnected when the motor is overloaded or phase loss is overheated, and the motor is protected.
TWS, means true wireless stereo. The implementation of this technology is based on the development of bluetooth chip technology. Technically speaking, it means that the mobile phone is connected to the main speaker, and then the main speaker is connected to the speaker through the Bluetooth wireless mode, thereby realizing the true separation of the left and right channels of the Bluetooth. When the slave speaker is not connected, the main speaker returns to the mono sound quality. TWS technology is used in the field of Bluetooth Headsets, so it has also spawned a new product - TWS Bluetooth headset.Since the TWS Bluetooth headset does not require a wired connection, the left and right earphones form a stereo system through Bluetooth, and the convenience of listening, talking, and wearing are improved.
Advantages:
1. True wireless structure, completely abandon wired troubles, and exercise more freely.
2. Various ways of use, both exclusive and shared, and can also be used as two earphones.
Headphones Earbuds,Bluetooth Earbuds,Earbud Bluetooth,Ear Buds Shenzhen Linx Technology Co., Ltd. , https://www.linxheadphone.com
2. PLC (Mitsubishi FX0N, FX1N), programmer connection and power-on operation.
3. Clear operation; program write operation; write out the instruction list according to the ladder diagram.
4. The main unit is connected to the motor by wire. 