Phase Converting Low Harmonics Regenerative Drives

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APG Series

Phase Converting
Low Harmonics
Regenerative Drives

Regenerative Design APG Series variable frequency drives (VFD) are inverter-based devices that convert single-phase input to three-phase variable frequency output to provide speed control for three-phase AC motors. The drives have regenerative capability, allowing regenerative power from the load to pass through the converter back to the line-side power source.

Save Energy Rather than burn regenerative power through a braking resistor, the APG Series regenerative drive puts the power back onto the line. Returning the regenerative power to the source will reduce the total power consumption of the load, saving money through reduced electrical power usage and also simplifying the installation by eliminating the braking resistor.

Phase Conversion Traditional three-phase regenerative drives cannot function as a phase converter. APG Series drives are purpose-built phase converting drives, and doubling the HP of the drive relative to motor HP is not required. Regenerative three-phase loads can now be connected to a single-phase source with all the benefits of a regenerative drive.

Voltage Conversion Active switching control of the line-side module allows the drive to boost 240V single-phase input to 480V three-phase output. Some models can be specified with either a 240V or 480V line-side converter. The load-side inverter is rated 480V on all models. Voltage doubling can realize significant savings from reduced wire size in long motor lead applications. This feature also allows connection of a 480V three-phase wind turbine to a 240V single-phase grid.

Low Harmonics Electronic power factor correction produces a sine-wave line-side current, greatly reducing the current distortion and line harmonics. Because of its favorable harmonic profile, input line reactors and harmonic filters are not required on the line side of an APG Series drive. Models are available with either an LC filter or an LCL filter. The LCL filter produces cleaner wave forms with lower harmonic distortion. Installations in many cases will comply with IEEE 519, the international standard for allowable harmonic distortion on utility mains.