To discuss the disturbance problem of LS inverter, we must first understand the operating principle of inverter, from the structural point of view, inverter is divided into direct inverter and direct inverter. The direct inverter is a communication that directly converts the I frequency current into a controllable frequency, and there is no intermediate DC link. Each phase of it is a reversible circuit with two sets of thyristors rectifying the reverse parallel connection. The amplitude of UO is determined by the control angle of each rectifier device, and the frequency is determined by the switching frequency of the two groups of rectifier devices. Now the most widely used is the direct inverter. The direct inverter is a communication that converts the power frequency current into DC through the rectifier, and then converts the DC into a controllable frequency through the inverter.
Direct inverters are constructed in three different ways:
(1) Controllable rectifier voltage conversion, inverter frequency conversion, voltage regulation and frequency modulation are carried out in two links, and the two should be harmoniously matched in the control circuit;
(2) Embryo control rectifier rectifier chopper Jue, inverter frequency conversion, this inverter rectifier link with chopper, with pulse width voltage regulation;
(3) Cun-controlled rectifier rectification, with PWM inverter frequency conversion, as long as the inverter adopts controllable shutdown of the fully controlled device (such as IGBT, etc.), the output waveform will be very close to the sine wave. No matter which kind of inverter, a large number of nonlinear power electronic components such as thyristors are used, no matter which rectification method is adopted, the method of inverter to draw energy from the power grid is not a continuous sine wave, but to the power grid with a pulsating intermittent method to obtain current, this pulsating current and the impedance along the power grid together constitute a pulsating voltage drop superimposed on the voltage of the power grid, so that the voltage is distorted, through the Fourier series analysis can be seen, This non-synchronous sine wave current is due to the fact that the fundamental wave with the same frequency and the harmonic with a frequency greater than the fundamental frequency are composed.
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LS power circuit breaker wiring method
The wiring method of the circuit breaker has the front of the board, the back of the board, the plug-in type, the drawer type, if the user has no special requirements, they are supplied according to the front of the board, and the wiring before the board is a common wiring method.
1. Wiring method behind the board: The wiring feature behind the board is that the circuit breaker can be replaced or repaired, without wiring from the beginning.
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The basic problem of LS electric molded case circuit breaker
Rated current of LS molded case circuit breaker:
Now in the process of using the molded case circuit breaker, it is necessary to understand the rated current of the molded case circuit breaker, and the rated current of the molded case circuit breaker is generally more than a dozen, mainly 16A...
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Contactors play a role in industrial electricity
The contactor is an automatic switch for industrial roofs to control its on/off with a button. The contactor consists of an electromagnetic coil, a static armature, a moving armature, a static contact, a moving contact and a fixing bracket. The principle is that when the electromagnetic coil of the contactor is connected to the communication electricity, a strong magnetic field will be generated to make the center of the coil ...
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The cause of the failure of low-voltage electrical appliances - LS power generation
In the control circuit of low-voltage electrical appliances, there are simple low-voltage components such as: buttons, safe, etc.; There are also slightly messy low-voltage electrical control components, such as circuit breakers, touch devices, time relays, thermal relays and other simple components, which makes it necessary to diagnose and analyze the cause of the problem.
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Precautions for the use of inverter - LS produces electricity
1. The inverter should not be installed on the equipment with vibration, because the main circuit connection screw in the inverter is simply loose, and many inverters are damaged due to this reason.
Second, the wiring problem: the inverter input termination on an air initial maintenance current value can not be too large, ...
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Characteristics of single-phase current converter - LS power generation
Single-phase current transmitter is a kind of power test substation developed for the power measurement of single-phase AC in motor test on the basis of motor test and test technology research, in accordance with IEC and relevant national specifications for motor test. The selection of advanced filtering technology, reasonable software algorithms, processing ...
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Introduction to inverter self-learning motor - LS power generation
1. What is a self-learning motor of inverter?
Enter the motor nameplate (voltage, current, Hz rating) in the inverter parameters, and then the inverter actively measures other parameters of the motor.
Second, why should the inverter learn by itself?
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The main structure of LS power AC contactor
The operating principle of the contactor is: when the contactor coil is energized, the coil current will generate a magnetic field, and the generated magnetic field will make the static iron core attract the moving core with electromagnetic attraction, and drive the communication contactor point action, the normally closed contact is disconnected, and the normally open contact is closed, and the two are linked. When the coil is de-energized ...
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Features of LS SUSOL series circuit breakers
Features of SUSOL series circuit breakers:
It can be used as the main switch of electrical equipment, and the limit breaking ability is high, Icu=Ics
Modular construction of circuit breakers: Tripper replacement (TS series) can be combined in a variety of combinations, such as ...
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LS power production PLC installation and wiring skills
The PLC should be kept away from strong disturbance sources such as electric welding machines, high-power silicon rectifiers and large-scale power equipment, and should not be installed in the same switch cabinet as high-voltage electrical appliances.
Power line, control line and PLC power line and I/O line should be separated from the wiring, barrier transformer and PLC and I/O should be selected ...
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The role of contactors in industrial electricity - LS generates electricity
The contactor is an automatic switch in industrial electricity that uses a button to control its on/off. The contactor consists of an electromagnetic coil, a static armature, a moving armature, a static contact, a moving contact and a fixing bracket. The principle is that when the electromagnetic coil of the contactor is connected to the communication electricity, a strong magnetic field will be generated to make the center of the coil ...
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What are the components of the PLC?
The basic components of PLC for power production:
1. Memory
The memory that registers the architecture software is called the architecture program memory.
The memory that registers the application software is called the user program memory.
2. Power supply
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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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Inverter carrier frequency adjustment method - LS power generation
A． The output voltage of the SPWM inverter is a series of pulses, and the pulse frequency is equal to the carrier frequency.
B. In the current of the motor, there is a harmonic component with a strong carrier frequency, which will cause the vibration of the motor core and announce the noise. If the frequency of the noise is the same as that of the motor core.
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Common faults in terminal blocks - LS generates electricity
From the point of view of application, the function that should be reached is: it is necessary to conduct the local area where the touch part should be conducted, and the touch is reliable. If the insulating part should not be conducted, it is necessary to insulate it firmly. There are three common types of faults in terminal blocks:
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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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LS power production contactor application
LS touchers are divided into AC touchers (voltage AC) and DC touchers (voltage DC), which are used in electricity, power distribution and consumption. Toucher broadly refers to the electrical appliances that use the current flowing through the coil to generate a magnetic field in industrial electricity, so that the contacts are closed, so as to control the load.
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The difference between voltage type and current type inverter - LS generates electricity
The differences between voltage type and current type inverter are mainly manifested in:
(1) the load of the buffer inverter of reactive power is an asynchronous motor, which is an inductive load, and in addition to transmitting active power between the intermediate DC link and the motor, there is also the exchange of reactive power. Because power electronic switches ...
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Inverter maintenance fault handling method - LS power generation
1. Not manifested. This situation is more common, generally in the normal condition of the external three-phase power supply, it is the switching power supply of the inverter burned, and the 24 volt power supply on the output board of the inverter terminal can be measured.
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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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