Low harmonic drives

Monday, 06 July, 2009 | Supplied by: Danfoss (Australia) Pty Ltd



Danfoss Drives has launched the VLT Low Harmonic Drive which is claimed will eliminate harmonic disturbances on the supply grid by actively imposing currents into the grid so that the high-quality sine wave of the grid current is restored.

Like other VLT drives, the Low Harmonic Drive is built on a highly modular technology platform and the basic elements have proved their functionality, quality and overall reliability in other parts of the broad VLT drives program.

The VLT Low Harmonic Drive has the same modular build-up as Danfoss’s normal high power drives and they share features like high energy efficiency, backchannel cooling and user-friendly operation.

Due to the modular principle, most elements are produced in large scale, leading to cost-effective production.

Since VLT drives are all individually configured according to the user’s specific needs — and only the VLT Micro Drive produced to stock — the VLT drives represent the value of a highly customised quality drive — for the price of a mass-produced unit.

The Danfoss Low Harmonic Drives continuously regulate the network and load conditions without affecting the connected motor.

VLT Low Harmonic Drives cause no increased winding stress or reduction of the bearing lifetime.

The VLT Low Harmonic Drive meets the harmonic recommendations and gives the user full readout of the unit performance towards the grid including graphical overview of grid behaviour.

VLT Low Harmonic Drives are available in the power range 160-710 kW.

The issue of preventing harmonic disturbances is growing with the employment of more and more powerful frequency converters. Even after many years’ growth of the drives market, only one out of eight motors is operated by a frequency converter. It’s expected that the huge potential for energy savings by employing frequency converters will increase the number of drives — and hence the potential harmonic disturbance on the supply grid.

The VLT Low Harmonic Drive meets the IEEE519 recommendation and is suitable for generator-powered installations as in back-up systems.

Online: www.danfoss.com.au
Phone: 03 9538 4444
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