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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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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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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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Common interference methods and processing of frequency converters
Aug 29 , 2022

Common inverter interference methods are: conduction interference, coupling interference, radiation interference. Anti-interference measures: For the interference signal transmitted by radiation, it is mainly weakened by wiring and shielding the radiation source and the line to be interfered. For the interference signal transmitted through the line, it is mainly dealt with by adding filters, react...

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What causes the variable frequency drive to heat up?
Aug 21 , 2022

When the variable frequency drive is working, the current flowing through the variable frequency drive is very large, and the heat generated by the variable frequency drive is also very large. Below, I will introduce to you the two main reasons and solutions for the heating of the variable frequency drive of the special machine: 1. The problem of the variable frequency drive and the motor itself; ...

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How to choose a variable frequency drive?
Aug 21 , 2022

The variable frequency drive generally chooses a 4-level motor, the base frequency operating point is designed at 50Hz, the frequency is 0-50Hz (speed 0-1480r/min) The motor runs at constant torque, and the frequency is 50-100Hz (speed 1480-2800r/min). The motor runs at constant power within the range of min), and the entire speed regulation range is (0-2800r/min), which basically meets the requir...

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Variable Frequency Drive fault judgment
Aug 04 , 2022

How to judge the fault of the Variable Frequency Drive? 1. The rectifier module is damaged Usually caused by grid voltage or internal short circuit. Replace the rectifier bridge after eliminating the internal short circuit. When dealing with faults on site, focus on checking the user grid conditions, such as grid voltage, whether there are electric welding machines and other equipment that pollute...

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Vfd manufacturers share the precautions for installing vfd
Aug 04 , 2022

The application of frequency converter in industrial production is very important. In addition to speed regulation and soft start, the most important thing is that it can save energy. At present, with the continuous improvement of industrial automation, frequency converters have also been widely used. Recently, many customers have inquired about the precautions when installing the inverter. The fo...

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Converting single-phase power to three-phase VFD
Jul 22 , 2022

Convert Single Phase VFD to Three Phase VFD A common question we get asked about is phase conversion: Can a variable frequency drive (VFD) convert my single-phase power supply to run a three-phase motor? Single-phase AC power is common in many residential and agricultural settings, but can also be seen in some industrial locations. It usually has only two phases (L1 and L2) and possibly a neu...

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