First, the frequency conversion skill is only one of the many power-saving skills, including voltage regulation and current limiting, power factor compensation, phased power regulation, frequency conversion, chopping, filtering, energy feedback and other skills, even for the use of frequency conversion principle of power saver, the frequency converter is only a unit in the power saver;
Second, the development and design of the power saver takes into account the various control requirements of the application site, and has various control functions that are convenient for on-site operation, such as temperature, pressure closed-loop control and other functions;
Third, in many industrial sites, the direct wiring device of the inverter does not meet the electrical standards, which simply causes various safety accidents, and the complete set of power savers can reduce the occurrence of accidents;
Fourth, the development and design of the power saver fully considers the safety maintenance of the built-in inverter, and sets up lightning protection circuits, overvoltage maintenance circuits and fault alarm functions to avoid accidental damage to the inverter itself to the greatest extent.
Fifth, according to the practical needs of the production site, the power saver generally has a built-in high-performance bypass system, which can still ensure the smooth progress of on-site production in the case of unexpected failure of the speed control unit.
Sixth, as we all know, the inverter will occur a certain harmonic in the working process, in many production sites, a large number of harmonic interference often causes equipment malfunction and even damage, in the development and design of the power saver, large power-saving enterprises will generally be for the harmonic situation on the site, in the internal device of the harmonic filter device, in situ to filter out most of the harmonics, which is very important for the safety production of the customer.
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The wiring distance between the motor and the inverter
Burn two new motors in a row! The output current and voltage of the inverter are balanced, the input voltage is balanced, the current is unstable, and the fluctuation is 20%-50%, the inverter is burned off by a short circuit between 35Hz turns, the grid voltage is very stable, 720V, the interval between the motor and the inverter is 120m, and the input and output terminals of the inverter are powered ...
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Precautions for inverter installation and wiring - LS power generation
The inverter is an electric power control equipment that uses frequency conversion skills and microelectronic skills to control the AC motor by changing the power supply frequency of the motor operation. It is used in a wide range of fields, including conveyors, feeders, mixers, grinders, pulverizers, paper cutters, calenders in various industries...
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The function and function of the inverter VFD - LS produces electricity
1. Energy saving
The energy-saving effect of VFD is mainly manifested in the application of fans and water pumps. After the fan and pump load is selected for frequency conversion speed regulation, the power saving rate is 20% - 60%, because the actual power consumption of the fan and pump load is basically proportional to the cubic speed. When users ask for an average ...
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The cause of motor burnout caused by inverter - LS generates electricity
In fact, the problems of the motor are not the cause of the motor itself, most of them are caused by the non-standard debugging of the inverter or the wrong inverter motor when the inverter motor is used, etc., mainly due to the following situations:
1. Put the general motor ...
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Failure analysis of electromagnetic system of LS power production contactor
(1) The core noise is large: it is normal for the electromagnetic system to produce a slight humming sound during operation, if the sound is too loud or abnormal, it can be judged that the electromagnetic system has a problem, and there are three reasons:
(1) Poor contact between the armature and the core or tilting of the armature. After repeated collisions between the touch of the armature and the core, ...
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The power of LS power inverter is selected
The relationship curve between the load rate β and the power η of the inverter can be seen: when β = 50%, η = 94%; When β = 100%, η = 96%. Although the β has doubled, the η change is only 2%, but it is also considerable for medium to high power (a few hundred kilowatts to several thousand kilowatts) electric motors. The system power is equal to the inverter power ...
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The working principle of LS PLC module
When LS PLC is put into operation, its operation process is generally divided into three stages: input sampling, user program fulfillment and output rewriting. The completion of these three phases is called a scan cycle. During the entire operation, the PLC's CPU repeatedly performs the ...
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Introduction to the design of inverter control cabinet - LS power production
The inverter should be installed inside the control cabinet, and the following problems should be paid attention to when planning the control cabinet:
1) Heat dissipation issues:
The heating of the inverter is caused by internal losses. In the inverter, the main circuit is the main circuit for the loss of each part, accounting for about 98%, and the control circuit accounts for 2%. ...
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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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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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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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LS power inverter function
1. Soft up
The direct launch of the inverter motor has a serious impact on the power grid, and it will also have too high requirements for the capacity of the power grid, which is extremely unfavorable to the service life of equipment and power grid circuits. After the use of inverter to save energy, the use of inverter's speed regulation (V/F) function will make the starting current from a small ...
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Fault solution for three-phase asynchronous motor - LS power generation
1. The motor cannot roll after being energized, but there is no abnormal noise, no peculiar smell and smoke.
1. Cause of the problem: (1) The power supply is not connected (at least two phases are not connected); (2) Fuse blowing (at least two-phase blowing); (3) The overcurrent relay is adjusted too small; (4) The wiring of the control equipment is faulty.
2. Question ...
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The role of the inverter's braking resistor - LS generates electricity
1. Maintain the inverter from the damage of regenerative electricity
In the process of rapid shutdown of the motor, because of the inertia, a lot of regenerative electric energy will be generated, if this part of the regenerative electric energy is not consumed in time, it will directly act on the DC circuit part of the inverter.
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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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The reason why the inverter cannot be equipped with a leakage protector
When using inverters, leakage protectors must not be used. This is a major principle of the use of frequency converters.
Some users choose the corresponding leakage protector for the inverter when using the inverter. *The result is: the inverter moves together, the leakage protector acts, and the system can't ...
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The working principle of LS PLC module
When LS PLC is put into operation, its operation process is generally divided into three stages, namely input sampling, user program fulfillment and output rewriting. The completion of these three phases is called a scan cycle. Throughout the operation, the PLC's CPU repeatedly performs the performance at a certain scanning speed on ...
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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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Introduction to LS Master-K series PLC programming
LS is an electrical equipment company affiliated to LG, kglwin3.62 programming software Chinese version is a professional plc programming software designed to help daily more efficient planning and development software, the software supports the programming and debugging of LG Master-K series and LG MASTER-K series, and provides ...
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Introduction of LS power inverter governor
Frequency conversion governor is the power frequency power supply (50Hz or 60Hz) into various frequencies of communication power supply, in order to complete the variable speed operation of the motor equipment, during which the control circuit completes the control of the main circuit, the rectifier circuit converts the communication power into direct current, and the output input of the DC center circuit to the rectifier circuit ...
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