Application of Frequency Converters
Frequency converters, also known as variable frequency drives (VFDs), are electronic devices designed to control the rotation frequency of alternating current (AC) electric motors. They play a crucial role in various sectors such as industry, energy, transportation, and others, providing efficient control of electric drives and thereby optimizing energy consumption and production processes.
Purposes of Using Frequency Converters
Frequency converters perform the following tasks:
- Rotation frequency control: The primary function of a frequency converter is to regulate the frequency of AC supplied to the electric motor, ensuring precise control of the motor’s rotation speed based on process requirements;
- Energy savings: VFDs enable the efficient use of energy by adjusting the operating speed of electric motors according to the current load. This reduces electricity consumption and contributes to resource conservation;
- Soft start and braking: Frequency converters ensure a smooth start and braking of electric motors, reducing mechanical stress and extending the equipment’s lifespan;
- Improved control accuracy: The ability to precisely adjust the frequency and, consequently, the rotation speed provides high control accuracy in various manufacturing processes.
Where are Frequency Converters Used
Variable frequency drives for AC motors have found widespread application in the following areas:
- Industry: Widely used to control drives for fans, pumps, conveyors, compressors, and other equipment, optimizing production processes and reducing energy costs;
- Energy sector: In the energy industry, frequency converters are employed to control generators and pumps in hydroelectric power stations, as well as to regulate fans and pumps in thermal power plants;
- Transportation: In the transportation sector, they are used to control electric drives for trains, trams, subways, and other vehicles;
- Household use: Frequency converters are also applied in household appliances such as air conditioning systems, refrigerators, and washing machines, providing efficient motor control.
Frequency converters play a key role in modern electrical engineering, ensuring efficient control of electric drives and enhancing energy efficiency across various industries. Their application contributes to improved production processes, reduced energy consumption, and increased equipment reliability.
The frequency converters supplied by our company represent a new generation of speed control systems characterized by optimized sensorless vector control and compatibility with Space Vector Pulse Width Modulation (SVPWM) mode. They stand out for their high-quality input power, high power factor, and superior signal parameters at the power output.
500VA SPh FC – 500 VA single-phase frequency converter
Name or Title |
Indicator |
Note |
500VA SPh FC |
- Input 30-70Hz Isolation
- Resistance 500Vdc 20MΩ
|
- frequency conversion
- voltage conversion
- phase conversion from 1 phase to 3 phases and from 3 phases to 1 phase
|

1kVA FC – 1 kVA Frequency Converter
Name or Title |
Indicator |
Note |
1kVA FC |
- Input 30-70Hz Isolation
- Resistance 500Vdc 20MΩ
|
- frequency conversion
- voltage conversion
- phase conversion from 1 phase to 3 phases and from 3 phases to 1 phase
|

50 kVA FC – 50 kVA Frequency Converter
Наименование |
Показатель |
Примечание |
50 kVA FC |
- Input 30-70Hz Isolation
- Resistance 500Vdc 20MΩ
|
- frequency conversion
- voltage conversion
- phase conversion from 1 phase to 3 phases and from 3 phases to 1 phase
|

7,5 kW V FC – Vector Control Frequency Converter 220V/380V
Name or Title |
Indicator |
Note |
7,5 KW V FC |
- Input 30-70Hz Isolation
- Resistance 500Vdc 20MΩ
|
- frequency conversion
- voltage conversion
- phase conversion from 1 phase to 3 phases and from 3 phases to 1 phase
|

0,75 KW V FC – Frequency Converter 220 V/380 V
Name or Title |
Indicator |
Note |
0,75 KW V FC |
- Input 30-70Hz Isolation
- Resistance 500Vdc 20MΩ
|
- frequency conversion
- voltage conversion
- phase conversion from 1 phase to 3 phases and from 3 phases to 1 phase
|

0,75 – 20 KW EE FC – Frequency Converter 220 V/380 V
Name or Title |
Indicator |
Note |
0,75 – 20 KW EE FC |
- Input 220V – 170-240; 380V – 330-440
- Output 220V – 0-220; 380V – 0-380 0.10 – 400 kHz
|
- frequency conversion
- voltage conversion
- phase conversion from 1 phase to 3 phases and from 3 phases to 1 phase
|

10 – 200 KW EE FC – Frequency Converter 220 V/380 V
Name or Title |
Indicator |
Note |
10 – 200 KW EE FC |
- Input 220V – 170-240; 380V – 330-440
- Output 220V – 0-220; 380V – 0-380 0.10 – 400 kHz
|
- frequency conversion
- voltage conversion
- phase conversion from 1 phase to 3 phases and from 3 phases to 1 phase
|

30 – 600 KW EE FC – Vector Frequency Converter 380 V
Name or Title |
Indicator |
Note |
30 – 600 KW EE FC |
- Input 220V – 170-240; 380V – 330-440
- Output 220V – 0-220; 380V – 0-380 0.10 – 400 kHz
|
- frequency conversion
- voltage conversion
- phase conversion from 1 phase to 3 phases and from 3 phases to 1 phase
|

0,5 – 20 KW VV FC – Frequency Converter 220 V/380 V
Name or Title |
Indicator |
Note |
0,5 – 20 KW VV FC |
- Input 220V – 170-240; 380V – 330-440
- Output 220V – 0-220; 380V – 0-380 0.10 – 400 kHz
|
- frequency conversion
- voltage conversion
- phase conversion from 1 phase to 3 phases and from 3 phases to 1 phase
|

Lift equip FC – Frequency Converter for Lifting Equipment
Name or Title |
Indicator |
Note |
Lift equip FC |
- Input 220V – 170-240; 380V – 330-440
- Output 220V – 0-220; 380V – 0-380 0.10 – 400 kHz
|
- frequency conversion
- voltage conversion
- phase conversion from 1 phase to 3 phases and from 3 phases to 1 phase
|

Auto el vehicl FC – Frequency Converter for Electric Vehicles
Name or Title |
Indicator |
Note |
Auto el vehicl FC |
- 300÷400 V DC for 43 kW
- 500÷650 V DC for 75 kW and 100 kW 250 A
- 12 V DC
|
- Vector Field-Oriented Control
|

Switch FC – Frequency Converter Control Device
Name or Title |
Indicator |
Note |
Switch FC |
- Input: 220V – 170-240; 380V – 330-440
- Output: 220V – 0-220; 380V – 0-380 = 0.10 – 400 kHz
|
- full electrical line isolation
- protection and emergency signaling function
|

Pump DC dviver FC – Solar Energy Conversion Control Device for Pump Power
Name or Title |
Indicator |
Note |
Pump DC dviver FC |
|
- full electrical line isolation
- protection and emergency signaling function
|

HV EE V FC – High-Voltage Vector Frequency Converter up to 10 kV
Name or Title |
Indicator |
Note |
HV EE V FC |
- Input: 220V – 170-240; 380V – 330-440
- Output: 220V – 0-220; 380V – 0-380 = 0.10 – 400 kHz
|
- full electrical line isolation
- protection and emergency signaling function
|

Purchase of Frequency Converters: Prices and Selection Guide
Frequency converters are an important part of automation and electric drive systems that allow for efficient control of motor speed, torque, and energy consumption. Here’s why you should consider buying a frequency converter:
- Energy Efficiency: Using a frequency converter helps optimize energy consumption and reduce equipment wear;
- Control Flexibility: The ability to easily and accurately change motor rotation speed is ideal for processes requiring speed variations.
Prices for Frequency Converters and Where to Buy
When considering purchasing a frequency converter, it’s essential to consider factors like power, connection type, manufacturer, and other specifications. Prices can vary depending on these factors and the purchasing location. In Moscow, you can find a wide selection of frequency converters at the company “LET.”
How to Choose a Frequency Converter:
- Power: Ensure the converter’s power matches your motor’s power;
- Type: Select the right type of converter (single-phase, three-phase, etc.) according to your equipment’s requirements;
- Reliability and Quality: When choosing a converter, consider the manufacturer’s reputation, warranty period, and feedback from other buyers.
Buying a frequency converter is a crucial decision to optimize the operation of electric motors. By selecting a suitable model considering all the factors mentioned above, you can enhance the efficiency and reliability of your equipment. Feel free to consult specialists at the company “LET” if you have any doubts or questions regarding frequency converter selection.
Call ☎ +7 (495) 232-00-66.