Difference between Frequency Converter and Variable Frequency Drive

Frequency converter is constituted by the entire circuit AC-DC-AC-filter converting device, it has been widely used. Frequency converter not only can analog output indicators of different countries, but also provide clean and reliable, low harmonic distortion, high voltage and frequency stability in the design, development, production, testing and other applications sine wave power output for export of electrical manufacturers. Frequency converter is very close to the ideal AC power grid voltage and is able to output the network voltage and frequency of any country. Variable frequency drive is organized by DC-AC-AC (modulated wave) and other circuits. Its output voltage waveform is a square wave pulse and harmonic component. The voltage and frequency vary in proportion and cannot be adjusted. It does not meet the requirements of the AC power supply.
Variable Frequency Drive vs Frequency Converter

Reliability
Frequency converter: The product has overall co-ordination design. After years of technology accumulation, it can ensure stable and reliable operation of the power supply.
Variable frequency drive: The variable frequency drive assembly shore power production is relatively simple, because the major part is purchased. It is difficult to ensure that the parameters matching with other elements.

Safety
Frequency converter: Frequency constant during startup. Shore power can provide clean, reliable, low harmonic distortion, stable voltage and high frequency sine wave power output, very close to the ideal AC power.
Variable frequency drive: It is designed specifically for motor variable frequency startup, start voltage and frequency synchronization rises. Using variable frequency drive for modified power supply, electrical equipment may be affected, especially the controlled rectifier, communications equipment and so on.

Three-phase imbalance
Frequency converter: Converting part apply star-shaped, each phase can be independently loaded, fully adapted to the three-phase unbalanced load. Unbalance rate can be less than 3%.
Variable frequency drive: Apply Δ inverting, although the output is transformed into Y-output, the three-phase unbalanced load adaptability is still poor, and may cause an increase in the reverse torque of the motor, making motor temperature rise, efficiency reduce, energy consumption increase and output depletion.

After-sales
Frequency converter: Manufacturer R&D production. Manufactures are very familiar with the converter, if there are problems, they can solve it in the shortest time on your site.
Variable frequency drive: It is mostly purchased from other specializing manufacturers, if there are problems, you will have to remove the device and return it to the manufacturer (partly abroad). This will cause long maintenance cycle, and the manufacturer is not responsible for matching the variable frequency drive to LC low-pass filter circuit. It will be difficult to completely solve the problem even in your site.

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