A frequency converter is actually an inverter. It starts by turning alternating current into direct current. Then the direct current is switched on and off with electronic components. Becomes alternating current. Thyristors for general inverters with larger power. And set up a device with adjustable frequency. Make the frequency adjustable within a certain range. It is used to control the number of revolutions of the motor. Make the number of revolutions adjustable within a certain range. Inverters are widely used in the speed regulation of AC motors. With the development of power electronics technology, AC frequency conversion technology has gradually matured from theory to practice.
(1) Current type inverter The current type inverter is characterized by the selection of large inductance as the energy storage link in the middle DC link, buffering the reactive power, that is, curbing the change of current, so that the voltage is close to the sine wave. The characteristic (advantage) of current type inverters is that they can contain frequent and drastic changes in load current. It is often used in applications where the load current changes greatly.
(2) Voltage inverter Voltage inverter is characterized by the selection of large capacitance for the energy storage element in the intermediate DC link, and the reactive power of the load will be buffered by it, the DC voltage is relatively stable, and the internal resistance of the DC power supply is small, which is equivalent to the voltage source, so it is called a voltage inverter, and it is often used in the occasion of large changes in load voltage. In addition, the inverter can also be classified by output voltage conditioning method, by control method, by main switch components, and by the input voltage bump.
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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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Inverter load test run step - LS power generation
1. Manually operate the work stop button of the inverter panel, investigate the work stop process of the motor and the display window of the inverter to see if there is any abnormal phenomenon.
2. If the inverter presents an overcurrent maintenance action during the process of starting P to abort the motor, ...
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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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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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Six misunderstandings in the installation and use of inverters - electricity production
Myth 1: Connect electromagnetic switches and electromagnetic touches in the output circuit of the inverter
In practical application, some occasions need to use the touch device for frequency converter switching: such as switching to the power frequency state when the frequency conversion is faulty, or the election is used to drag two methods, a motor is faulty, and the variable frequency is used.
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Precautions for inverter installation tips - LS power generation
When the line power supply exceeds the driver's kV-A rating by 10 times, add a line reactor.
A 3% impedance line reactor should be used to reduce power line transients caused by capacitor switching, line notching, DC bus overvoltage tripping, and inverter overcurrent and overvoltage conditions. Line...
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The touch screen controls the inverter steps
1. The touch screen is controlled by PLC inverter
1. At present, the general control of the inverter needs to use PLC to communicate with the inverter, read the information of the inverter, and then the touch screen communicates with the PLC in order to complete the control of the inverter to start, stop, and monitor the operation of the inverter.
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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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The role of the inverter - LS generates electricity
1. The inverter can adjust the power of the motor and complete the variable speed operation of the motor, so as to achieve the purpose of saving electricity. For example, it is reflected in the centrifugal fan and water pump, when the centrifugal fan and water pump use the frequency converter, the operator can convert the frequency to regulate the speed, and can easily control the flow rate according to the need, so as to save ...
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Calculation method of filter capacitance value of inverter
Alternating current can be converted into direct current using rectifier electricity, but in three-phase electricity, this DC voltage or current contains voltage or current ripple with a frequency of six times the frequency of the power supply. In addition, the inverter inverter will also generate ripple voltage or current due to output and carrier frequency, etc., and reverse ...
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Analysis of the problem of LS power inverter
1. What is the maintenance function of the inverter?
Maintenance functions can be divided into the following two categories:
(1) After detecting the abnormal situation, the correction action is automatically carried out, such as overcurrent loss speed avoidance, regeneration overvoltage stall avoidance.
(2) Block the PWM control signal of power semiconductor equipment after detecting the abnormality ...
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The reason for the overload trip of the inverter - LS generates electricity
1. The load is too heavy, the load carried by the motor is too heavy, or in other words, the resistance torque of the production machinery exceeds the additional torque of the motor.
2. Use improper overload, for example, increase the operating frequency of the inverter to the extra frequency of the motor, and the motor is in the extra frequency.
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Analysis of the fault problem of LS power terminal block
From the point of view of application, the function of the terminal block should be achieved: it is necessary to conduct the local conduction of the touch part, and the touch is reliable. The insulating part should not be conducted, and it is necessary to insulate it firmly. There are three common forms of fatal problems in terminal blocks:
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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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Whether the C-type circuit breaker is suitable for the motor circuit - power generation
Type C micro-break is used for general circuits, such as lighting circuits; D-type circuit breakers are used in power circuits such as electric motors, so can C-type micro-breakers be used in motor circuits?
Differences between C-type and D-type discontinuity:
C-type micro-disconnect: with ...
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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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What is the difference between LS inverter and LG inverter?
LS inverter and LG inverter are the same, there is no difference between the two.
LS inverter, the full name of LS AC inverter governor, after supplying a variety of configurations, converts direct current into communication power, and changes the general power supply ...
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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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Brake unit, brake resistor function - LS generates electricity
Brake unit:
The function of the braking unit is to turn on the energy-dissipating circuit when the voltage Ud of the DC circuit exceeds the specified limit (such as 660V or 710V), so that the DC circuit can release energy by thermal energy after passing through the braking resistor. The braking unit can be divided into built-in and external, the former is ...
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Introduction to electrical equipment - LS Electricity
According to the requirements of safe, high-quality, reliable and economical operation of the production, transforming, transportation, distribution and use of electric energy in power plants and substations, the following electrical equipment is mainly included.
1. Primary equipment
Directly involved in production, ...
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