Frequency conversion motor refers to the motor that runs continuously with 100% rated load in the range of 10%-100% rated speed under standardized environmental conditions, and the temperature rise will not exceed the allowable value of motor calibration.
Communication contactors are not necessary for inverters, and because they are built-in, the price of VFDs is higher than that of soft engines. Frequency conversion skill is a motor control equipment with high skill content, complete control function and good control function in the field of modern motor control. It regulates the speed and torque of the motor by changing the frequency of the power grid. Because it involves power electronics skills and microcomputer skills, the cost is high, and the requirements for repair skills are high, so it is mainly used in fields that require speed regulation and high requirements for speed control.
With the rapid development of power electronics skills and new semiconductor equipment, communication speed control skills have been continuously improved, and frequency conversion skills have been widely used in communication motors with their outstanding output waveforms and excellent cost performance. For example, the communication frequency conversion motor has been used in large motors in steel plants, small and medium-sized roller motors, traction motors for railway and urban rail transit, elevator motors, lifting motors for container lifting equipment, pump fan motors, compressors, household appliances, etc., and has achieved outstanding results.
The frequency converter can change the initial output frequency. For example, the output frequency starts at 0 Hz and gradually increases to 50 Hz, thus decreasing the starting current. However, inverter motors cannot be operated under heavy loads. After the inverter of the induced draft fan of our factory, the inlet and outlet baffle of the fan should be opened before starting, and the starting voltage of the inverter motor is very low (the starting voltage is controlled by the inverter itself). The starting voltage of the 6KV induced draft fan is less than 1KV.
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Common faults and countermeasures of power inverters
1. OC failure
Like other inverters, overcurrent alarm is also a common fault of power inverter, in addition to the reasons for parameter settings such as acceleration and deceleration time, there are mainly the following possibilities in hardware: damage to high-power modules may cause OC alarm, low-power economical inverter ...
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The difference between servo drive and frequency converter - LS produces electricity
Servo drives and frequency converters are defined differently
The driver, also known as servo manipulator and servo amplifier, is a kind of manipulator used to control servo motors, and its function is similar to that of a frequency converter acting on a general communication motor. It is part of the servo system, mainly used for high-precision positioning ...
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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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Introduction of plc inverter - LS power generation
Because the imported products of the inverter brand have their own PLC function, they mainly play an important role in the control effect of mechanical equipment, and play an important role in the equipment, which can regulate the operation and control of the machine and meet the requirements of users.
It should be scale
pLC ...
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Safety precautions for LS inverters
1. When the power supply is now powered or the inverter is in operation, do not open the shell of the inverter. Otherwise, an electric shock may occur.
2. When the front cover of the inverter is opened, do not run the inverter. Otherwise, you may be subjected to ...
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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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The difference between inverter and servo - LS produces electricity
An important difference between servo and frequency conversion is that frequency conversion can be without encoder, while servo must have an encoder for electronic commutation.
1. What the two have in common:
The skill of communication servo itself is the learning and application of ...
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Selection of the color of the conductor of the high and low voltage switchgear - LS power production
1 AC three-phase circuit
a) Yellow for phase A, green for phase B, and red for phase C;
b) Light and blue colors for the neutral line or neutral line;
C) Yellow and green two-color wires are used for safety grounding wires.
2 AC circuits connected by twinax wires or stranded wires: red, black ...
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Energy-saving method of ventilator inverter - LS power generation
high-power
Although some inverters are fan type inverters, but it is a low-power fan inverter, such an inverter does not have the effect of energy saving, and it is necessary to achieve energy saving must be a high-power inverter, in addition to the high-power fan inverter, it is necessary to meet its ...
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LS produces common sense of electroplastic case circuit breaker
(1) Tripping
LS electric molded case circuit breaker basically involves the tripping unit in the process of practical application, and the tripping is generally a thermomagnetic tripping or electronic tripping, and we must also understand this different tripping method in advance.
In practice the application ...
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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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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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How to troubleshoot the fault of the inverter - the power inverter
Because the application method is incorrect or the setting environment is unreasonable, the inverter will simply malfunction and cause problems, or the expected operation effect will not be satisfied. In order to prevent problems before they occur, it is important to carefully analyze the cause of the problem in advance.
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Inverter exception handling method - 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 properly;
3. Check whether the ventilation pores and mask grilles are blocked;
4. Check if the load is too heavy.
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Precautions for powering on the inverter after the LS power production holiday
1. During the holiday, low temperature can easily cause the equipment to be damp, check whether the electrical equipment is dry, whether there is moisture and condensation;
2. Check whether the grounding wire is loose and whether the cable is damaged by rodents and insects;
3. Sort out the dust and oil stains, and inverter ...
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The power frequency motor is abnormally installed with an inverter - LS produces electricity
Installing a variable-frequency drive (VFD) on the power frequency motor can complete the accurate control and speed regulation of the motor, and improve the power and accuracy of the forward motor. However, if not properly equipped and used, it may cause the following hazards:
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LS static test to determine the fault of the inverter
Generally, the general-purpose inverter roughly includes the following parts: (1) rectifier circuit; (2) DC central circuit; (3) Inverter circuit; (4) Control circuit. The static test is mainly a test of the high-power transistors (power modules) of the rectifier circuit, DC center circuit and inverter circuit. Whole...
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The difference between overload and overcurrent of the inverter
(1) The maintenance objectives are different
Overcurrent is mainly used to maintain the inverter, whereas overload is mainly used to maintain the motor. Because the capacity of the inverter sometimes needs to be increased by one or even two gears than the capacity of the motor, in this case, the inverter is not necessarily overcurrent when the motor is overloaded.
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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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Inverter circuit board repair and drawing-free maintenance method - LS power generation
1. Be "confident"
It is necessary to fully understand the principles of some typical circuits and be familiar with them. Guangzhou Kewo Training Center believes that drawings are dead, and the thoughts in the head are alive, able to make analogies, able to reason, and able to touch analogies. For example, switching power supply is always inseparable from ...
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