Demand more energy efficiency.
The RGX series of variable frequency drives is specifically designed to meet regenerative and/or low harmonic needs through the use of an active, bidirectional power converter on the front end of a common DC bus drive.
Eliminate the need for an external resistor or mechanical braking, thus simplifying system design, with the RGX VFD’s dynamic performance and great motor handling. It also delivers superior reliability, reducing total current distortion to 2–3%. The Active Front End design offers energy savings and design compatibility for a wide range of applications.
The RGX VFD impacts a wide range of applications including conveyors, ball mills, extruders, centrifugal pumps, driver winders and a variety of test stands.
Harmonic mitigation techniques can help protect equipment from potential damage, reduce power generation to overcome losses, and eliminate utility fines. Learn more about harmonics.
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| Technology |
Eaton VFD type |
How it works |
Typical THD |
Advantages |
Disadvantages |
|---|---|---|---|---|---|
| Inductive reactors |
Mitigates higher-order harmonics by providing high input impedance that limits high-frequency currents. | 33-38% |
Low-cost, simple application |
Low effectiveness Voltage drop concerns |
|
| 12-Pulse converters |
HCX |
Two parallel 6-pulse converters fed by parallel isolation transformer paths, phase shifted 30°, which mitigates 5th and 7th order harmonics. Input impedance mitigates higher-order harmonics as well. | 12-18% |
Simple to apply Extremely robust |
Not as effective as other methods Relative high cost compared to passive filter |
| Passive filters |
Provides high input impedance for higher-order harmonics and a shunt-tuned reactor and capacitor to mitigate 5th and 7th harmonics. | 6-8% |
Simple retrofit Low cost for performance Insensitive to voltage balance |
Challenges with generator design Power factor issues Less robust than 18-pulse |
|
| 18-Pulse converters |
CPX |
Three parallel 6-pulse converters fed by a single-phase shifting autotransformer, phase shifted 20° to cancel all harmonics below the 17th. Input impedance mitigates higher-order harmonics as well. | 3-6% |
Simple to apply Extremely robust |
Higher cost on small hp |
| Active Front End drives |
RGX |
IGBT-based front end pulls relatively linear power from the line and uses a L-C-L filter to mitigate the IGBT switching noise. | 3-5% |
Slightly higher efficiency Immune to voltage imbalance Regeneration capability |
High cost, not as robust as 18-pulse |
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