The rectifier part of the general inverter selects the diode uncontrollable bridge rectifier circuit, and the middle filter part selects a 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 larger than the steep pulse wave, which has a greater impact on the power grid and other surrounding equipment, and sometimes interferes with other electronic equipment.
The installation of a communication input reactor at the input end of the inverter can inhibit the transmission of harmonics generated by the inverter to the power grid, reduce the interference of the harmonics generated by the inverter to other electrical equipment, and limit the abnormal fluctuation of the grid voltage and the impulse current on the power grid, and reduce its impact on the inverter.
The output voltage of a general-purpose inverter contains harmonics other than fundamentals. The lower harmonics generally have a greater impact on the motor load, causing torque ripple, and the higher harmonics increase the leakage current of the inverter output cable, so that the motor output is insufficient, so the high and low harmonics output of the inverter must be suppressed.
The installation of a communication output reactor on the output side of the inverter can optimize the communication waveform output of the inverter, suppress the harmonic current, avoid the leakage current to the ground caused by the capacitance to the ground on the outlet side of the inverter, and extend the cable length from the inverter to the motor side.
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Inverter air boost test step - LS power generation
1. Download the control program.
2. Put the inverter in open-loop experimental mode and set the appropriate parameters.
3. Connect the incoming cable of the inverter. The cable on the output side of the inverter is not connected.
4. Push the high-voltage cabinet to the experimental position, close the switch, and ...
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Fatal failure of LS power terminal block
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 fatal problems in terminal blocks:
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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 application of LS inverter in the grinding machine industry
First, the process requirements of the grinding machine:
The grinding machine is a kind of textile machinery, and its function is to polish the dyed cloth to improve its added value, which is an important process in the printing and dyeing process. The traditional drive mode is driven by a DC motor, which is linked with the lifting rod ...
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How to use the installation wiring of the LS inverter
1. Circuit wiring
(1) The input (R, S, T) and output (U, V, W) of the inverter cannot be connected incorrectly;
(2) Wire diameter selection
(1) The wiring of the power supply and the inverter and the wire diameter selection method of the motor of the same capacity are the same;
(2) The wiring between the inverter and the motor should consider the line electricity.
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Quickly locate switching power supply faults
Switch Mode Power Supply (SMPS) will cause the base of the switch tube to fail to get the switching pulse and intermittently operate due to the short circuit of the load, the failure of the self-vibration circuit and the loss of control of the protection circuit, which makes it difficult to locate the shortcomings of SMPS. Difficult to repair the work ...
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Three-phase motor current is too high - LS 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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LS power production contactor selection
How LS Contactor Works:
Generally, after the contactor coil is energized, the entire coil current will generate a magnetic field, which will make the core inside have electromagnetic attraction to attract the core, and let their communication contactor point action normally closed contact disconnect, or close, which ...
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LS inverter series and its features
LS inverter, the full name of LS communication frequency conversion governor, after supplying a variety of equipment, converts direct current into communication electricity, and changes the voltage and frequency of ordinary power supply input to control the speed of the motor, to meet different industrial needs, and then complete the energy saving and environmental protection of the automation system. ...
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LS Electric reached a strategic cooperation with Nandu Power Supply and Changzhou Kunlan
Due to the "new infrastructure" policy, the Chinese government has vigorously promoted the new energy and ESS markets, and according to CNESA, the cumulative electrochemical energy storage scale in China will reach 19.3GW in 2023, which is expected to exceed 20% of the global market.
June 3 ...
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Faulty failure with soft starter - LS generates electricity
In the use of soft starters, some users often have some wrong concepts:
1. It is believed that whether the motor can be started successfully is related to the function of the soft starter, and a good brand or even a foreign brand should be selected under heavy load.
2. When the motor is not ...
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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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Analysis of common faults of LS AC contactors
AC contactor is generally used to turn on or off the power supply in the control circuit of electromechanical equipment, it can frequently turn on or off the AC circuit, and can realize long-distance control.
The toucher is mainly composed of a contact system and an electromagnetic system, and the problem of AC contactor is generally generated in the coil.
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LS automatic gain adjustment for power generation
In fact, there are also options for automatic gain adjustment, which generally divide the control response into several levels, such as high echo, medium echo, and low echo, which can be set by the user according to actual needs.
Azimuth Share Buff:
1. Set the share gain of the azimuth ring adjuster;
2 ...
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A common fatal form of failure of the terminal block - LS power generation
1. Poor touch
The metal conductor inside the terminal block is the core part of the terminal, which transmits the voltage, current or signal from the external wire or cable to the touch piece corresponding to the connector it matches. Therefore, it is necessary for the touch parts to have excellent structure, stable and reliable touch firmness.
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Electromagnetic interference caused by the working principle - LS power inverter
1. Harmonic disturbance
The rectifier circuit will produce harmonic current, which produces a voltage drop on the impedance of the power supply system, resulting in distortion of the voltage wave pattern, and the voltage of this distortion constitutes a disturbance on many appearances, and the common voltage distortion is the flattening of the top of the sine wave. Harmonic wave...
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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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The protection measures of the power generator inverter for the motor
The protection of the motor by the power converter mainly includes the following aspects: overvoltage protection, undervoltage protection, overcurrent protection, phase loss protection, inverter protection, overload protection, grounding protection, short circuit protection, overfrequency protection and stall protection.
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The impact of power quality problems on frequency converters - electricity production
(1) Excessive voltage error will increase the loss of electrical equipment, shorten the life, and work abnormally, which will damage the stability of the synchronous operation of the power system, the stability of the voltage and the economic operation of the power grid, and will cause the inverter system to report overvoltage fault or undervoltage fault.
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An integral part of an electrical solid state relay
Solid state relays consist of three parts: the input circuit, the barrier (coupling), and the output circuit.
Input Circuit:
According to the different categories of input voltage, the input circuit can be divided into DC input circuit, communication input circuit and AC-DC ...
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