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Variable frequency drives

RGX regenerative variable frequency drives

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.

Core features of the RGX regenerative VFD

  • Ease of use: Uses the core SPA/SPI drive platform therefore, sharing many of the drive-related characteristics of the component drive including Startup Wizard and built-in applications 
  • Space-saving design: All-in-one package that includes circuit protection, LCL filtering, and AFE drive in a single enclosure 
  • Efficiency: Exceptional energy savings is achieved the regenerative braking feature 
  • Rugged: Reliable control module and operating system as SPX, shared components for inverter and Active Front End for reduced spare parts
  • Reliable: Meets IEEE-519 standards by reducing THD 2-3%.

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Specifications
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Eaton's enclosed drives portfolio

Standard options

Enclosure options

  • NEMA Type 1, 1 filtered,12, 3R, 7
  • Wall-mount
  • Floor-mount
  • Space heater

Pilot device options

  • Indicating lights
  • Pushbuttons
  • HOA switches
  • Speed potentiometers
  • E-stops
  • External keypad

Control options

  • CPT
  • Terminal blocks
  • Control relays
  • Timers

Metering options

  • Elapsed time meter
  • Volt meter
  • Amp meter
  • Frequency meter
  • Power meter

Input power options

  • Circuit breaker disconnect
  • Fused disconnect
  • Fuses
  • Surge protection
  • Input reactor

Bypass options

  • Three-contactor bypass
  • Reduced voltage soft starter (RVSS) bypass

Output power options

  • Output contactor
  • Output reactor
  • dV/dt filter
  • Sine wave filter

Technology comparison

Technology
Eaton VFD type
How it works
Typical THD
Advantages
Disadvantages
Inductive reactors

EGS

SVX

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

EGF

CFX

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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