The inverter circuit is the first part of the inverter
The function of the DC central circuit is to smooth the output of the rectifier circuit to ensure that the inverter circuit and the control power supply can obtain a DC power supply with higher quality. When the rectifier circuit is the voltage flow center circuit, the primary component of the central circuit is the electrolytic capacitor of the large capacitance, and when the rectifier circuit is the current image, the lubrication circuit is mainly composed of the large capacitance inductor. In addition, due to the need for motor braking, the DC center circuit sometimes contains braking resistors and other auxiliary circuits. The inverter circuit is one of the most important parts of the inverter, and its primary function is to convert the DC silver produced by the slippery circuit into an alternating current image with arbitrarily adjustable puffiness and voltage under the control of the control circuit. The output of the inverter circuit is the output of the inverter, which is used to realize the speed control of the asynchronous motor.
The control circuit of the inverter includes several parts, such as the main control circuit, the signal detection circuit, the gate drive circuit, the external interface circuit and the maintenance circuit, which is also the core part of the inverter.
The quality of the control circuit determines the performance of the inverter. The primary function of the control circuit is to send various signals obtained by the side detection circuit to the operation circuit, so that the operation circuit can supply the necessary gate drive signal for the main circuit of the inverter according to the requirements, and provide necessary maintenance for the inverter and the asynchronous motor. In addition, the control circuit also receives/transmits various forms of external signals and gives the internal operation status of the system through external interface circuits such as A/D, D/A, etc., so that the inverter can cooperate with external equipment for various high-performance control.
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How to select servo motor - power production
Each type of servo motor has additional torque, maximum torque and servo motor inertia and other parameters in the standard items, each parameter and load torque and load inertia must have a relevant connection, the output torque of the servo motor should meet the requirements of the movement conditions of the load organization, such as the speed of the acceleration ...
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Inverter fault handling - LS power generation
1. The working temperature of the inverter is high
1. Check whether the ambient temperature of the inverter is too high;
2. Check whether the cooling fan inside the device is working normally;
3. Check whether the ventilation pores and mask grilles are blocked;
4. Check if the load is too heavy.
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The role of LS electric contactors
1. It is often used in electric motors as control targets.
2. It is used to control power loads such as factory equipment, electric heaters, working machines and various power units.
3. It has the effect of low voltage release protection.
4. It is suitable for frequent operation and long-distance control, and is an automatic operation.
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Inverter life extension method - LS power generation
1. The inverter should not be installed on the equipment with a sensation, because the main circuit connection screw in the inverter is easy to loosen, and many inverters are damaged due to this reason.
2. Wiring problem: the input terminal of the inverter should be connected to a ...
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The lightning protection port of the inverter - LS generates electricity
According to the applied engineering practice, variable frequency drive (VFD) lightning strikes can be roughly divided into direct lightning, induced lightning and conducted lightning. But no matter what form it takes to reach the device, it can be summarized as a lightning surge from the following four parts, which are called lightning protection ports here, with V ...
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Analysis of the problem of excessive current of LS three-phase motor for power generation
First, the power supply problem
1. The power supply voltage is too high
When the power supply voltage is too high, the motor back electromotive force, magnetic flux and magnetic flux density all increase. Since the magnitude of the iron loss is proportional to the square of the magnetic flux density, the iron loss increases, resulting in overheating of the core. And the increase in magnetic flux causes ...
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The matrix alternating control mode of the inverter - LS power generation
VVVF frequency conversion, vector control frequency conversion, and direct torque control frequency conversion are all one of the AC-DC-AC frequency conversion. One of the disadvantages is that the input power factor is low, the harmonic current is large, the DC circuit needs a large energy storage capacitor, and the regenerative energy cannot be reflected back to the grid, that is, it cannot carry out four-quadrant operation.
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Inverter control motor operation method - LS power generation
When the main circuit of the inverter is connected to the power line, in order to control the operation of the motor, it is also necessary to connect the relevant terminals to the peripheral control circuit, and set the parameters of the inverter's starting method to the external operation form.
The inverter controls the motor to run, and there are two common methods, which are to turn on the ...
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Wiring method of the main circuit of the inverter - LS power generation
1. The power supply should be connected to the R, S, and T terminals of the VFD, and should not be connected to the VFD (U, V, W), otherwise the VFD will be damaged. It is necessary to clean up the trivial parts of the wire head after wiring, which may lead to abnormalities, failures, and failures, and it is necessary for the VFD to always be clean. When punching holes in the console, note that ...
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Introduction to the control method of LS power inverter
Inverter control method: low-voltage general frequency conversion output voltage is 380-650V, output power is 0.75-400kW, operating frequency is 0-400Hz, and its main circuit adopts AC-DC-AC circuit. Its control methods have gone through the following five generations.
1U/f=C sine pulse width modulation ...
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Fault analysis of servo motors – LS power generation
1. Problem phenomenon: servo error OL, servo motor can not start, and there is abnormal sound problem analysis and possible causes:
(1) Bearing damage, foreign objects falling and stuck, stator magnet bursting and falling or moving tissue jamming caused by the motor itself.
(2) ...
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The difference between input reactor and output reactor – LS produces electricity
The rectifier part of the general inverter selects the diode uncontrollable bridge rectifier circuit, and the middle filter part selects the large capacitor as the filter, so the input current of the rectifier is actually the charging current of the capacitor, and the harmonic component is relatively steep and steep.
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Analysis of heat dissipation problems of inverter - LS power generation
In order to use the inverter correctly, it is necessary to consider that the service life of the VFD decreases exponentially with the increase in temperature. This is due to: When the ambient temperature rises by 10 degrees, the service life of the VFD is halved. So pay attention to heat dissipation! When the VFD is working, the current flowing through the VFD is very large, and the VFD emits ...
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The cause of the broken shaft of the motor - LS generates electricity
1. Improper device:
The motor is not concentrious with the equipment being dragged, resulting in excessive radial load on the motor, which eventually leads to metal exhaustion. When the radial load on the extension end of the motor shaft is too large, it will cause the motor shaft to have zigzag deformation in the radial direction. When the motor rotates, the shaft's ...
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Analysis of the selection of major ventilator inverters - LS power generation
Now enterprises need to use a lot of ventilator inverters, the larger the scale of the enterprise, the more production workshops, the more ventilator inverters will be used. However, no matter how large the enterprise, there is a primary ventilator inverter, the selection of this kind of inverter is very important, because if there is no ...
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Variable frequency regenerative braking method - LS generates electricity
1. Energy consumption type
This method is to connect a braking resistor in parallel in the DC circuit of the inverter, and control the on/off of a power tube by detecting the DC bus voltage. When the DC bus voltage rises to about 700V, the power tube is turned on, and the regenerative energy is passed into the resistor.
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Introduction of LS AC motors
1. AC synchronous motor: that is, the rotor is composed of permanent magnet data, so after rolling, with the change of the stator rotation magnetic field of the motor, the rotor also changes the speed of the response frequency, and the rotor speed = stator speed, so it is called "synchronization".
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LS power converter interference phenomenon
1. As soon as the inverter of the heat exchange station is opened, the pressure transmitter jumps randomly;
2. Use the inverter to control the water supply, the pressure transformer is used as the signal to collect the pressure, and the pressure transformer is disturbed by the inverter;
3. When the inverter starts the motor, the voltage converter signal is unstable and beats violently;
4. Pressure transformer (4-20 ...
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The size of the contactor is selected by the type of contactor - LS produces electricity
1. Select the corresponding category of contactor according to the control object, operation times and application category of the contactor.
2. Select according to the rated voltage of the line at the application location.
3. Select the rated current of the main contact of the contactor according to the load capacity.
4. About the voltage level of the lead coil ...
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The production power takes you to read the PLC ladder diagram
1. Trapezoidal stairs start from the horizontal line and end up with a vertical line (generally you can omit not to draw, only draw the left busbar). On the left side of each row is the junction combination, indicating the conditions that drive the logic coil, while the logic coil indicating the effect can only be connected to the bus on the right. The contact can not appear in the coil right ...
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