As an electronic electric, the inverter itself also consumes electricity (about 3-5% of the additional power). A 1.5 hp air conditioner consumes 20-30W of electricity, which is equivalent to the length of a lamp. The inverter works under the power frequency and has the function of saving electricity, which is practical.
But the conditions are:
At the top of the list, high power and fan/pump loads
Second, the device itself has a power-saving function (software support)
Third, endure and continue to work
The above are the three conditions that show the results of power saving. If it is said that the power frequency of the inverter is energy-saving without conditions, it is important or trading speculation. If you know what happened, you'll do it for you. It is necessary to pay attention to the place of use and the conditions of use to use it accurately, otherwise it is.
The power factor makes up for the energy savings
Reactive power not only adds line loss and equipment fever, but also leads to the decline of power factor in the active power of the power grid.
After using the frequency conversion speed control device, because of the induction of the internal filter capacitor of the frequency converter, the reactive power loss is reduced and the active power of the power grid is added.
Soft engine energy saving
The hard start of the motor has a severe impact on the power grid, and the requirements for the capacity of the power grid are too high, and the large current and vibration generated when the motor is started are extremely harmful to the baffle and valve, and the service life of the equipment and pipes is extremely unlucky.
After the use of inverter energy-saving device, the soft start energy of the inverter will make the starting current start from zero, and the maximum value will not cross the additional current, which can reduce the impact on the power grid and the requirements for power supply capacity, delay the service life of equipment and valves, and save the cost of equipment.
Theoretically, frequency converters can be used in all mechanical equipment with electric motors. When the motor is started, the current will be 5-6 times higher than the extra, which will not only affect the service life of the motor, but also consume more electricity. The speed of the motor is fixed, but in the actual application process, sometimes it is necessary to work at a lower or higher speed, so there is often a need for frequency conversion.
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Basic characteristics of inverter transmission - Reynolds
Compared with the motor driven by the inverter, the power factor and efficiency of the motor will deteriorate and the temperature rise will increase because the output waveform of the inverter contains the influence of higher harmonics. On the other hand, when the frequency conversion is driven, the same torque should be obtained as when the power frequency power supply is driven, ...
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How to control the torque of the inverter vector according to the system - Reynolds
A brief introduction to the progress of the inverter in terms of torque:
This function adds the output voltage of the inverter so that the output torque of the motor is proportional to the square of the voltage, so as to improve the output torque of the motor. Improve the skill of insufficient torque at low speed output of the motor, and use the "vector manipulation" ...
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Reynolds inverter power selection
The system power is equal to the product of the power of a general-purpose inverter and the power of the motor. As long as both work efficiently, the system power will be higher. From the perspective of power, when choosing VFD power, you should pay attention to the following points:
VFD ...
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The reason why the inverter controls the motor – Reynolds
Q1: Why should I use VFD to control the motor?
When it comes to this issue, let's take a brief look at these two devices. The motor is an inductive load that hinders the change of current, and when it is started, a large change in current is generated. VFD, which is actually made up of a rectifier inverter circuit, ...
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Method for measuring the quality of frequency converter modules – Reynolds
1. Test rectifier circuit:
To the P end and N end of the DC power supply inside the inverter, adjust the multimeter to the resistance X10 gear, the red watch rod is connected to P, and the black watch rod is separated from R, S, T, and there are tens of ohms of resistance in normal times, and it is basically balanced. Instead, connect the black watch rod to the P end, and the red watch stick will be ...
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The reason for the large fluctuation of harmonic parameters in the harmonic test of the output harmonic test of the inverter
In order to measure stable harmonics, it is necessary to meet the following two conditions:
At the top of the list, the signal is a stable periodic signal.
Second, it is necessary to perform harmonic analysis according to the integer multiple of the period of the stable periodic signal.
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The basic principle of vector control – Reynolds frequency converters
The fundamental principle of vector control is to control the excitation current and torque current of the asynchronous motor according to the principle of magnetic field orientation through the measurement and control of the stator current vector of the asynchronous motor, and then to achieve the purpose of controlling the torque of the asynchronous motor. Specifically, it is to ...
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Reynolds inverter E.oC3 constant speed operation overcurrent fault solution
Reynolds inverter RNB1000 series E.oC3 constant speed operation overcurrent fault solution
Reynolds inverter fault codes:
E.oC3
Reynolds inverter fault phenomenon/type:
Constant speed operation overcurrent
Possible causes of Reynolds inverter failure:
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The inverter needs to rectify and then invert the cause - Reynolds
Special inverter suppliers remind you that in daily industrial production, there are inverters that do not require rectifier units, which are the so-called alternating current inverters. However, the vast majority of the market is AC-DC-AC frequency converter, which also contains a rectifier unit, which is a certain level of technology and market competition.
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Inverter maintenance and undervoltage fault handling - Reynolds
In the repair of the inverter, we often hear about overpressure problems, but underpressure problems are also common problems encountered in the use of inverters. The reason is that the main circuit voltage is lower than the lower limit caused by the maintenance action or the damage of a rectifier bridge or the instantaneous power failure of the power grid, and the input is flat. Inverter after-sales ...
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The lightning protection method of Reynolds inverter
The lightning protection measures of the inverter equipment are another important peripheral measure to ensure the safe operation of the inverter, especially in the area where lightning is active or in the lively season, this problem is particularly important.
Today's inverter products are generally equipped with lightning ...
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The item that needs to be maintained after the inverter is shut down – Reynolds
1. Use a vacuum cleaner with a plastic nozzle to thoroughly clean the inside and outside of the inverter cabinet to ensure that there is no excessive dust around the equipment.
2. Check the ventilation and lighting of the frequency conversion room, and the ventilation equipment can operate normally.
3. Check the inverter ...
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Rated current analysis of inverter leakage circuit breaker
The output of the inverter is controlled by PWM (pulse width modulation, similar to high-speed switching), so a high frequency leakage current will occur, if you want to install a general leakage disconnect switch on the primary side of the inverter, it is recommended to select a sensitivity current of more than 200mA for each inverter and the action time is 0.1 seconds ...
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Introduction to soft starters and their relationship with frequency converters - Reynolds
When the high-power motor starts, the current is large, which will cause the grid voltage to be seriously shaken, in order to deal with this problem, the general requirements for speed regulation are not high, and the soft engine can be used to reduce the voltage and start. However, the drop in the starting current when the step-down is started will also make the starting torque drop significantly.
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Reynolds-5G empowers the paper industry to improve quality and efficiency of the industrial IoT control system
From September 23rd to September 25th, 2020, the 2020 China International Paper Technology Exhibition was held in Hall D1 of Suzhou International Expo Center.
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Features of the unit tandem inverter - Reynolds
(1) The multi-pronged PWM control method is selected, and the output voltage waveform is close to the sine wave.
(2) The rectifier circuit is multiplied, the number of pulses is as high as 36, the power factor is high, and the input harmonic is small.
(3) Modular design, compact structure ...
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Precautions for installation of Reynolds low-voltage inverters
One. Safety Precautions
1. First of all, it is necessary to have certain electrical professional knowledge, and understand the job site, understand the equipment status, and have certain electrical operation technology.
2. Determine the voltage level of the equipment (such as low-voltage AC380V) and whether it is low-voltage ...
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The main failure mode of mechanical parts – Reynolds
The top failure modes of mechanical parts:
Failure: The mechanical part cannot complete its normal function within the planning and booking period and under the regular conditions.
Ways in which mechanical parts fail: overall cracking, plastic deformation, corrosion, abrasion, gluing, and touch exhaustion
General ...
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Features of electronic single-phase current transmitter – Reynolds
Single-phase current transmitter is a kind of electric power test substation developed for the power measurement of single-phase communication in motor experiments on the basis of motor experiment and testing technology research, in accordance with IEC and relevant national specifications for motor experiments. The use of advanced filtering technology, reasonable software algorithms, ...
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The inverter prepares the braking resistance factor – Reynolds
The preparation of the braking resistor of the inverter is mainly to consume part of the energy on the DC bus capacitor through the braking resistor to avoid the capacitor voltage being too high. Theoretically, if the capacitor stores a large amount of energy, it can be used to release it to drive the motor and avoid energy waste. However, the capacitance of the capacitor is ...
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