1. The actual output waveform of the inverter is PWM wave, which contains carrier signals in addition to the fundamental wave. The carrier signal frequency is much higher than that of the fundamental wave, and it is a square wave signal, which contains a lot of higher harmonics, and the test system requires a higher sampling frequency and bandwidth.
2. In the environment of inverter power supply, all kinds of high-frequency disturbance are everywhere, and electromagnetic disturbance is much stronger than that of the power frequency environment, which requires the test system to have stronger electromagnetic compatibility ability.
3. The peak factor of PWM wave is generally higher, and the general appearance is satisfied with the requirements.
4. The appearance used for frequency conversion test should have the ability to decompose its fundamental wave in various PWM waveforms, and the method of digital signal processing is required for strict measurement, that is, high-speed sampling to obtain the sample sequence, and then the sample sequence is discrete Fourier transform to obtain the amplitude, phase and the amplitude and phase of each harmonic of the fundamental wave.
As far as the main flow instrument of frequency conversion measurement is concerned, Hall sensor plus frequency conversion power analyzer is a selection method for many manufacturers, but the limitations of this method are constantly expanding, and the main manifestation is that the disturbance problem in the transmission link is difficult to deal with, which is the fatal injury of this measurement method. The choice of a power analyzer based on front-end digitization can deal with this problem well, which will also become the primary method of frequency conversion measurement in the future.
The reason why the inverter motor is energy-saving is not that the inverter motor itself has low loss, but that under the non-sinusoidal voltage and current, the higher harmonics will cause the increase of the stator copper consumption, rotor copper consumption, iron consumption and additional loss of the motor. If the inverter motor is running in the power frequency environment at the same time, the difference between the inverter motor and the general motor is not big, and even the inverter motor is more and more energy-consuming, that is to say, we can not blindly trust the inverter must be energy-saving. The above is the difference between inverter motors and general motors, and users can choose the right motor according to their characteristics.
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Mitsubishi PLC communication detection steps
When you are ready to communicate through AJ71QE71, perform the ping procedure in MS-DOS mode to check if the connection is correct before the Mitsubishi PLC's GPPW starts to communicate. Support communication with Weilun touch screen through serial port.
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Pay attention to the problem when choosing an inverter - Mitsubishi Electric
The current value of the motor is used as the basis for the selection of the inverter, and the rated power of the motor is only for reference.
Compared with the general squirrel cage motor, the winding motor simply has the problem of overcurrent tripping, and the slightly larger capacity than the usual ...
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Anti-interference performance measures of Mitsubishi PLC system
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In the PLC control system, the power supply occupies a very important position. The power grid disturbance series into the PLC control system is mainly through the power supply of the PLC system (such as CPU power supply, I/O power supply, etc.), the power supply of the transmitter and the power supply with P ...
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Mitsubishi inverter installation reactor features
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1. It is suitable for reactive power compensation and harmonic control
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Which components in the Mitsubishi inverter need to be replaced regularly
Mitsubishi inverter is composed of many electronic parts, such as semiconductor components, etc., in the application and protection involves the replacement of a related component, because of the composition or physical characteristics of the inverter, in a certain period of time will deteriorate, thus reducing the characteristics of the inverter, is ...
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The intuitive method refers to the search and analysis of faults based on the external manifestations of Mitsubishi inverter defects without any instruments. The visual method includes an unpowered view and a power-on survey. In the overhaul, the first thing to do is to check without power, that is, to use the human sensory organs (eyes, ears, hands, nose) to check the relevant plug-in.
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Mitsubishi FX2N Series Extended PLC Module Selection Chart
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The basic logic instructions of the Mitsubishi FX series plc
Fetch Command and Output Command (LD/LDI/LDP/LDF/OUT)
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（2） LDI ...
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Mitsubishi causes electromagnetic interference
1. Harmonic disturbance
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Fault analysis of Mitsubishi inverter OC1 and OC3
Mitsubishi inverter OC (overcurrent problem) will be caused by the following reasons, taking A500 series inverter as an example:
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2）. ...
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Comfortable operating environment for Mitsubishi inverter FR-A800
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Mitsubishi PLC keeps the circuit written
There is a very common kind of circuit in Mitsubishi PLC - the persistence circuit. The holding circuit means that when the external input switch is a button, it can press the button through the holding circuit to insist on the output, similar to the self-locking in the electrical diagram. We use Mitsubishi PLC as an example to write a sticking circuit.
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Mitsubishi Electric develops satellites for greenhouse gas and water cycle observations
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Inverter overload fault factor - Mitsubishi inverter
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Mitsubishi Electric appeared at the 2021 China Smart Expo
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