There are several ways to classify frequency converters:
According to the classification of the main circuit operation method, it can be divided into voltage-type inverter and current-type inverter; According to the classification of switching methods, it can be divided into PAM control inverter, PWM control inverter and high carrier frequency PWM control inverter;
According to the classification of operating principles, it can be divided into V/f control inverter, slip frequency control inverter and vector control inverter, etc.;
According to the classification of use, it can be divided into general-purpose inverter, high-performance special inverter, high-frequency inverter, single-phase inverter and three-phase inverter.
Inverter control method
The output voltage of low-voltage general frequency conversion is 380-650V, the output power is 0.75-400kW, and the operating frequency is 0-400Hz. Its operators have experienced the following four generations.
1U/f=C sinusoidal pulse width modulation (SPWM) manipulation method
It is characterized by a simple structure of the control circuit, low cost, good hardness of mechanical characteristics, which can meet the smooth speed regulation requirements of general transmission, and has been widely used in various fields of industry. However, at low frequency, due to the low output voltage, the torque is significantly affected by the voltage drop of the stator resistance, so that the output torque is reduced.
In addition, its mechanical characteristics are not as hard as DC motors after all, dynamic torque and static speed regulation functions are not satisfactory, and the system function is not high, the control curve will change with the change of load, the torque echo is slow, the motor torque utilization rate is not high, and the function decreases due to the existence of stator resistance and inverter dead zone effect at low speed, and the stability deteriorates. Therefore, people have studied vector control frequency conversion speed regulation.
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Mitsubishi FR-A700 series inverter problem
1. Consultation question: FR-A700 series Mitsubishi inverter, the suffix is ending in -CA1, what kind of inverter?
Solution: The suffix -CA1 is a special model with take-up control.
2. Consultation question: FR-A ...
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Introduction to Mitsubishi tension controllers
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The tension manipulator can be called the tension manipulator, which is usually used with magnetic particle brake, magnetic particle clutch and tension detector, which is suitable for winding, unwinding, tension control, etc. It also has the so-called manual control function, which generally refers to the fact that human beings can ...
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Mitsubishi catalogue of some small PLC models and commonly used touch screens
Commonly used touch screen model description
Economical touch screen GS2107-WTBD 7 inch widescreen, 800*480, 65535 colors, USB/232/422/Ethernet, DC
Pass through...
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Methods for shortening the scanning cycle of PLC programs – Mitsubishi
1. Try to avoid using "double words" when you can use "words", and try to prevent using real numbers when you can use integers.
2. Give priority to the use of surplus (other than hardware connection) IB, IW, ID, QB, QW, QD, followed by M and S;
3. Try to prevent the transformation of data types, ...
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Mitsubishi inverter pre-use debugging method
1. No-load energizing test of Mitsubishi inverter.
1. Ground the ground terminal of the Mitsubishi inverter.
2 Connect the power input terminal of the Mitsubishi inverter to the power supply through the leakage maintenance switch.
3 Check whether the factory display window of the Mitsubishi inverter is normal, if it is not correct.
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PLC control cabinet design and use to meet the heat dissipation requirements - Mitsubishi
The PLC control cabinet is the final level of equipment in the power distribution system. It mainly protects, supervises and controls the entire circuit, which is convenient for unified management. The power distribution cabinet is a kind of equipment that can reasonably distribute electrical energy and make the circuit easy to open and close. But because it is a circuit device, the requirements for the level of safety protection ...
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Mitsubishi servo system failure type
The origin orientation is incorrect, and the encoder debugs/zeros the bit
Replacement of bearings, wear of bearing grooves, cracking of the rotor, cracking of the shaft
Gear groove wear
The magnet bursts steel, the magnet falls, gets stuck and doesn't move
Encoder wear, code/glass disc wear and crack
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The built-in analog quantity of the Mitsubishi PLC function module is changed to current input
Mitsubishi FX5UCPU module has a built-in analog input as a voltage input (DC0-10V),
In this way, it can be converted into an analog current input (DC4 - 20m).
[Method used in current input (DC4 - 20mA)]
FX5UCPU module only supports voltage ...
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Built-in time adjustment in Mitsubishi PLC
How do I adjust the built-in moments in my Mitsubishi PLC? In the case of Mitsubishi PLC, sometimes technical engineers forget to adjust the PLC well, but they also need to pay attention to some key points and introduce how to adjust the built-in moments in Mitsubishi PLC.
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Review and comparison of Mitsubishi PLC control inverter methods
1. The switching signal of PLC controls the inverter
The output point and COM point of the PLC (MR type or MT type) are directly connected to the STF (forward engine), RH (high speed), RM (medium speed), RL (low speed), and input SG ports of the inverter. The PLC can be programmed to control the inverter's start, ...
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An introduction to the types of data inside the Mitsubishi FX series
A lot of data is used in the internal structure of the PLC and in the user's use program. These data have the following forms in terms of structure or number system.
(1) Decimal number
Decimal numbers are also known as word data in PLC. It is first and foremost ...
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The difference between the performance of Mitsubishi servo motor and stepper motor
First, the control accuracy is different
The step angle of the two-phase hybrid stepper motor is generally 1.8° and 0.9°, and the step angle of the five-phase hybrid stepper motor is generally 0.72° and 0.36°. There are also some high-performance stepper motors with smaller step angles after subdivision. Communicate the control of servo motor ...
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How to deal with Mitsubishi PLC failures
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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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There is no self-locking reason for the Mitsubishi servo motor to be turned on
In some cases, when the user first touches the use of the Mitsubishi servo motor, it may appear that the Mitsubishi servo motor is not self-locking after it is ready! So, what is the reason for this? And how to deal with it?
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Programmable Controller System Design and Debugging Steps – Mitsubishi PLC
The main steps in the planning and commissioning of the programmable manipulator application system
(1) In-depth understanding and analysis of the process conditions and control requirements of the controlled target
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Mitsubishi tells you what IGBT is
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How does Mitsubishi PLC work?
1. A scanning cycle is divided into input sampling, program fulfillment, and output rewriting.
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Mitsubishi servo motor code failure
1. Disadvantages of UVT
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