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Which parts of the VFD need to be replaced regularly
Aug 29 , 2022

When we are using VFD, we must be familiar with the basic working principle and functional characteristics of VFD. Before the inspection and maintenance of the frequency inverter, the main power supply of the equipment must be cut off; and the Variable Frequency Drive indicator light must be completely extinguished. Daily inspection items: Before powering on the VFD, check the temperature and humi...

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Variable frequency drive VF control and vector control
Nov 23 , 2022

At present, the main purpose of using frequency converters is energy saving and speed regulation, so according to different requirements, there are frequency converters with different control functions: conventional V/F control frequency converter and vector control frequency converter. With conventional V/F control, the voltage drop of the motor will increase relatively with the decrease of the m...

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How does a frequency converter work?
Nov 23 , 2022

The first stage of the variable frequency AC drive is the frequency converter. The converter consists of six diodes, similar to the check valves used in plumbing systems. They allow current to flow in only one direction: the direction indicated by the arrow in the diode symbol. For example, whenever phase A voltage (voltage similar to pressure in plumbing) is more positive than phase B or C voltag...

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Frequently asked questions about VFD
Nov 23 , 2022

1. What is a variable frequency drive? The AC drive is a power control device that uses the on-off function of the power semiconductor device to convert the power frequency power supply to another frequency. 2. What is the difference between PWM and PAM? PWM is the abbreviation of Pulse Width Modulation, which changes the pulse width of the pulse train according to a certain rule to adjust the out...

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Frequency converter selection
Nov 24 , 2022

1. Brand selection At present, there are hundreds of Frequency converter brands on the market, and the brand and model should be considered comprehensively according to various factors such as project budget, project requirements, and personal familiarity. In terms of market share, Japanese companies such as Toshiba, Mitsubishi, Fuji, and Panasonic are important variable frequency drive manufactur...

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How VFD realizes speed regulation and energy saving
Nov 29 , 2022

VFD has the functions of voltage stabilization, speed regulation, voltage regulation, frequency regulation, etc. It applies modern science and technology. Although it is expensive and has a complicated internal structure, it has good performance and is easy to use. Therefore, variable frequency drive is not only used for motors, but also for different Power, shape, and volume are widely used in va...

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Protection function of frequency drive
Nov 29 , 2022

VFD is a control device that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's operating power supply. Vfd inverter is mainly composed of rectification (AC to DC), filter, inverter (DC to AC), braking unit, drive unit, detection unit, micro-processing unit, etc. VFD provides the power supply voltage it needs by turnin...

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The composition of general purpose VFD
Dec 06 , 2022

Frequency conversion speed regulation is to change the synchronous speed of the rotating magnetic field by changing the power supply frequency of the motor stator. It is an efficient speed regulation method without additional slip loss. The outstanding advantages are high speed regulation efficiency, low start-up energy consumption, wide speed regulation range, stepless speed regulation, fast dyna...

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Fault Analysis of Frequency Converter Overvoltage
Dec 06 , 2022

During the operation of the vfd drive, due to different operating conditions, the voltage may fluctuate greatly. When the intermediate DC circuit overvoltage occurs, it will have a great impact on the normal operation of the vfd drive, and even damage the equipment. , Causing casualties, the overvoltage phenomenon generated by the vfd drive usually refers to this type of overvoltage. First, the ov...

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Troubleshooting method for variable frequency inverter overvoltage
Dec 06 , 2022

The previous article focused on the analysis of variable frequency inverter overvoltage faults, and this article focuses on some processing methods. 1. Input side processing method Since there is an impulse voltage on the input side, it will usually lead to an overvoltage fault of the variable frequency inverter. Therefore, before the lightning strike and the change of the compensation capacitor s...

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Can variable frequency drive run in parallel?
Dec 19 , 2022

It turns out that a 7.5KW frequency converter drives a 7.5KW belt motor. Due to technical reasons, the power of this 7.5KW motor needs to be increased to 15KW. The original frequency converter is no longer specified, and the power is too small! So, is there any good solution? Some people will think whether the variable frequency drive can run in parallel like a transformer? That is, two 7.5KW vari...

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The Benefits and Applications of Variable Frequency Drives (VFDs)
Feb 14 , 2023

Variable Frequency Drives (VFDs), also known as frequency converters, are widely used in industry to control the speed and torque of electric motors. These devices can be used in a variety of applications, including pumps, fans, conveyors, and even machine tools. They are popular because they provide precise control over motor speed, which can lead to increased efficiency, reduced energy consumpti...

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