Control method: i.e. speed control, rotation control, PID control or other methods. After adopting the control method, it is generally necessary to carry out static or dynamic identification according to the control accuracy and requirements. Low running frequency: that is, the motor runs at a small speed, when the motor runs at low speed, its heat dissipation function is very poor, and the motor runs at low speed for a long time, which will lead to the incineration of the motor. And at low speeds, the current in the cable will also increase, which will also cause the cable to heat up.
High operating frequency: the general frequency converter has a large frequency to 60Hz, and some even to 400 Hz, the high frequency will make the motor run at high speed, which is for the general motor, its bearing can not run at a long time beyond the extra speed, whether the rotor of the motor can accept such centrifugal force.
Carrier frequency: The higher the carrier frequency is set, the greater the weight of its higher harmonics, which is closely related to the length of the cable, the heating of the motor, the heating of the cable and the heating of the inverter.
Motor parameters: The inverter sets the power, current, voltage, speed, and high frequency of the motor in the parameters, and these parameters can be directly obtained from the motor nameplate. Frequency hopping: At a certain frequency point, there may be a resonance phenomenon, especially when the whole device is relatively high; When operating the compressor, it is necessary to prevent the surge point of the compressor.
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Misunderstanding of power-saving and energy-saving use of inverter - LS power generation
Industrial control automation products inverters are described as power-saving, energy-saving control automation products, therefore, many people will think that as long as the equipment is installed with inverters, it will be able to save energy and electricity, but this is not the case.
The inverter of industrial automation products itself produces energy-saving and power-saving ...
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Relationship between motion control and frequency converter
Motion control has a significant period characteristic, it is a combination of a variety of high-tech to push industrial automation, office automation and home automation to a higher stage. At present, the motion control is mainly composed of three parts: inverter, motor and controller.
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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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The inverter selects the appropriate peripheral equipment - LS power generation
After we have selected a suitable Variable-frequency Drive (VFD), we also need to consider whether we need to equip other peripheral equipment according to the actual situation of the site. The peripheral equipment selected by VFD mainly includes circuit breakers, reactors, contactors, braking resistors, etc.
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How to choose LS contactors
The working form of LS contactor:
Generally speaking, 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 make their AC contactor ...
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Inverter overvoltage fault analysis method - LS power generation
The overvoltage of the inverter is manifested in the tributary voltage of the DC bus. Under normal conditions, the direct current of the inverter is the average value of the three-phase full-wave rectification. If calculated by 380V line voltage, the average DC voltage Ud=1.35U line=513V.
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Automatic adjustment of motor parameters - LS power generation
Step 1: If the motor can be completely separated from the load, in the case of a power failure, the motor is mechanically separated from the load, and the motor is allowed to rotate freely without load.
Step 2: After powering on, select the VFD command source (F0-04) as the command channel of the operation panel.
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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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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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LS power production automation subdivision industry service era
LS power automation drives are mainly for industrial enterprises and construction enterprises, including municipal, metallurgical, electric power, chemical and other power-oriented industrial enterprises, car, food and beverage, pharmaceutical and other professional enterprises, as well as OEM equipment manufacturing enterprises.
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Explanation of basic terms of electrician - electricity production
1. Active power - in the process of generating and transmitting alternating current energy, the part of energy used to convert into electromagnetic methods is called active power
2. Reactive power - in the process of AC electric energy generation and transmission, it is used for electromagnetic field AC in the circuit.
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LS has reached agreements with Doosan and Hanwha in Korea on a business model for vacuum power generation
LS Electric recently signed an MOU agreement with Doosan Fuel Cell, Hanwha Power Systems, and Hanwha Asset Management in Seoul, Korea, to establish a business partnership for city gas companies to develop a fuel cell-vacuum power generation business model. Through this agreement, the two sides will expand the scope of cooperation ...
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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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What are the advantages of frequency conversion speed regulation - LS power production
1. Outstanding frequency conversion speed regulation characteristics
Completing the frequency conversion speed regulation of asynchronous motor is the "century wish" that people have been waiting for since the creation of asynchronous motor for 100 years. Through unremitting improvement, enhancement and perfection, the speed regulation function of VFD is not bad, that is, compared with the DC speed regulation system, the part ...
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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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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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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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Reasonable selection of LS inverter
The selection of the inverter should be considered according to the type of controlled object, speed regulation scale, static speed accuracy, starting torque, etc., so that it is easy to use and economical together with the satisfaction of process and production requirements.
1. Inverter and the motor to be operated
(1) The number of poles of the motor. General motor ...
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Methods for extending the service life of inverters - LS generates electricity
1. The influence of electromagnetic disturbance on the inverter:
In the modern industrial control system, the microcomputer or PLC control technology is mostly selected, and in the process of system planning or transformation, it is necessary to pay attention to the disturbance of the inverter to the microcomputer control board. The inverter is disturbed by the outside world, because the user ...
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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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