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BETECH VFD

BETECH VFD

Grosvenor Pumps

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Electronic Speed Variator. Manual Auto control. An ancillary electrical device used to control motor speed , not a drive-line component (unlike MV) Motors on standard pumps are suitable for 3:1 turndown from 50Hz (or 4:1 turndown from 60Hz) i.e you can over-speed the standard pump by the 20% if required, to give 20% higher flow rates.

Grosvenor Pumps's own words, read from their page.

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The part other shops don't tell you. Three separate questions, kept separate on purpose, each with its source.