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What is a frequency converter?
400 Hz, 100 Hz, 60 Hz, 50 Hz, and 25 Hz inverters
A frequency converter, also known as a frequency inverter, transforms electrical power from 50 Hz or 60 Hz to 400 Hz. This can be accomplished either through a double-conversion static frequency converter or by using an electromechanical generator set called a rotary converter. A frequency converter is a device that changes the frequency of electrical power from one value to another. It can be implemented via a double-conversion static frequency converter or by employing an electromechanical generator set known as a rotary converter. In the double-conversion approach, a rectifier converts alternating current into direct current, and an inverter then reconverts the DC back into AC. In an electromechanical generator set, this adjustment can be achieved by varying the speed of the generator—through changes in belt‑and‑pulley arrangements or gearbox settings—or by operating motors and generators with different numbers of poles, thereby attaining the desired output frequency.

Single-phase converter
The SFC1 series (single-phase static inverters) features a versatile communication platform, enabling local, networked, or remote monitoring and control. The communication package includes an RS‑232 serial port and USB connectivity. PS&C has invested significant time in developing this advanced communication suite to meet the needs of today’s tech‑savvy customers. By adding a battery to the SFC1 series, the inverter can be transformed into an inverter‑UPS.
Static inverter
The SFC3 series phase‑static frequency converters employ 6‑ and 12‑pulse topologies along with an IGBT architecture, enabling highly efficient solid‑state frequency conversion. This advancement gives PS&C’s converters a significant advantage over conventional alternatives. PS&C avoids the use of older technologies in its products, allowing these units to reliably power equipment even under the most extreme electrical conditions. By integrating batteries into the SFC3 series, the converter can be transformed into a variable‑frequency UPS.

Dynamic Frequency Regulator
The DFR series delivers the same impeccable reliability as all power systems and control equipment, thanks to its foundation in our hybrid rotary technology. The frequency regulator is suitable for ratings from 25 to 500 kVA. Our unwavering commitment to power quality has underpinned the development of this industrial‑grade product, which simultaneously corrects both frequency and voltage. This reliability, combined with a long‑life design, gives the DFR series a distinct advantage over all other regulators currently available on the market.
Rotary frequency converter
Rotary frequency converter:
The RFC series employs mature electric generator‑set technology. A rotary inverter provides reliable power to the equipment while converting input voltage and frequency. The RFC also functions as a rotary filter, safeguarding critical loads from transients and surges. In general, it delivers 100% performance for power interruptions lasting less than 100 milliseconds. Our models are available with either synchronous or induction motors and can be configured horizontally or vertically.
Computers and small electronic devices use switch-mode power supplies that can operate at 50 Hz and 60 Hz. In such cases, the only item you may need is a plug adapter, since 50-Hz outlets differ from 60-Hz outlets for the following reasons. Because the operating frequencies of 60 Hz and 50 Hz are different, you should avoid plugging your device into the wrong type of outlet. However, if your device is rated for 208 V—compatible with both 50 Hz and 60 Hz—it may be fine. Otherwise, you risk damaging the equipment and/or injuring yourself. Once smoke has escaped from the device, it cannot be put back inside.
Large‑scale and three‑phase equipment must not be operated at an incorrect frequency, as this can lead to damage or premature wear. Equipment designed for 50 Hz cannot be run at 60 Hz. Forcing such equipment to operate outside its design specifications will result in problems; most likely, it will fail immediately—remember the smoke? If a failure does not occur right away, the equipment will eventually degrade over time due to fatigue and overheating. As the global economy continues to grow, equipment originating from other regions is being used more and more frequently in countries where it was not originally manufactured.
This typically necessitates the use of a variable-frequency drive (also known as a VFD). It adjusts the frequency—and sometimes the voltage—of the local utility supply to match the requirements of the equipment you’re operating, thereby ensuring compatibility with the load’s power demands.
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