In industrial and manufacturing applications, variable frequency drives (VFDs) have become common-place; VFDs hold distinct advantage over other electronic controls, such as increased energy efficiency, more refined signal control, and the ability to start and stop with a ramp-up and ramp-down schedule (variable speeds).

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However, VFDs introduce disadvantages in the form of nonlinear loads; nonlinear loads cause voltage spikes, voltage transients, and harmonic distortion on the supply voltage. All of these nonlinear behaviors can cause nuisance tripping of circuit breakers and blown fuses; they can create interference and otherwise damage sensitive electronics equipment; and they can cause stress and increased heat on valuable induction motors. Additionally, harmonic distortion can be transmitted on to the grid, which has caused utility companies to adopt standards that limit the amount of harmonic distortion allowed on to the AC grid from a facility.

In order to protect your motor from unnecessary stress, overheating, life degradation, and premature failure, install a CTM Sinewave Filter between the VFD and your motor. The CTM Sinewave Filter will take the output signal from the drive, remove voltage spikes and mitigate harmonic disturbances, and transform the messy output signal from the VFD into a near-perfect sinusoidal waveform.

CTM line/load reactors should be installed to protect sensitive electronic equipment and reduce detrimental harmonic distortion throughout the facility. Additionally, line/load reactors can be installed on either side of the variable frequency drive to provide moderate motor protection (load side), to absorb everyday power line distortions (line side), or help meet the requirements of IEEE 519 (line side).

For the best in line side harmonic filtering, utilize CTM active front-end filters to mitigate deleterious harmonic distortion and meet the stringent requirements of IEEE 519.

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