Danfoss VLT AQUA Drive Design Manual page 16

2. Introduction to VLT AQUA Drive
2.7. Advantages
2.7.1. Why use a frequency converter for controlling fans and pumps?
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A frequency converter takes advantage of the fact that centrifugal fans and pumps follow the laws of proportionality for such fans and pumps. For further
The Laws of Proportionality
information see the text
2.7.2. The clear advantage - energy savings
The very clear advantage of using a frequency converter for controlling the speed of fans or pumps lies in the electricity savings.
When comparing with alternative control systems and technologies, a frequency converter is the optimum energy control system for controlling fan and
pump systems.
Illustration 2.1: The graph is showing fan curves (A, B and C) for re-
duced fan volumes.
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.
Illustration 2.2: When using a frequency converter to reduce fan ca-
pacity to 60% - more than 50% energy savings may be obtained in
typical applications.
®
MG.20.N4.02 - VLT is a registered Danfoss trademark
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VLT AQUA Drive Design Guide