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Danfoss VLT Advanced Harmonic Filter AHF 005

New Generation of VLT® Advanced Harmonic Filters

29 January 2010
A new generation of VLT® Advanced Harmonic Filters (AHF) has been developed to replace the successful VLT 5000 Advanced Harmonic Filters range.

The new filters have been presented to the market at the SPS exhibition in Nuremberg, Germany in November 2009 and will be released in February 2010.

The new generation is designed for and thoroughly tested with the VLT Frequency Converter series drives. The harmonic mitigation performance remains the same as for the existing versions with 5% and 10% THiD.

Compact design

A new and patented coil design allows a much more compact design without compromising the harmonic performance. Compared to both the existing AHF’s and the competition, this new generation of filters is up to 60% smaller, reducing the wall space necessary for installation.

The reduced size and weight also allows the power range to be extended to cover the full
D-frame VLT Frequency Converter series with one single filter. E and F-frame drives can still be mitigated with parallel connected filters.

Best performance

The new generation AHF’s have been extended so that a 5% and 10% variant exists for each VLT Frequency Converter series power size. Because of a perfect match between the VLT Frequency Converter current and the filter current a better harmonic mitigation can be guaranteed.

A reduction of the capacitive current of up to 30% is possible due to an improved coil design which results in smaller capacitor values. This improves the filter performance, removes the changes of over-voltage tripping and lowers the capacitive current at partial load.

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