Danfoss VLT Flow Drive FC 111 - 3 Product Overview; 3.1 Advantages; 3.1.1 Why Use a Drive for Controlling Fans and Pumps?; 3.1.1.1 The Clear Advantage - Energy Savings

3 Product Overview
3.1 Advantages
3.1.1 Why Use a Drive for Controlling Fans and Pumps?
A drive takes advantage of the fact that centrifugal fans and pumps follow the laws of proportionality for such fans and pumps. For
further information, see 3.1.1.2 Example of Energy Savings.
3.1.1.1 The Clear Advantage - Energy Savings
The clear advantage of using a drive for controlling the speed of fans or pumps lies in the electricity savings.
When comparing with alternative control systems and technologies, a drive is the optimum energy control system for controlling
fan and pump systems.
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SYSTEM CURVE
FAN CURVE
PRESSURE%
A
B
C
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VOLUME%
Illustration 1: Fan Curves (A, B, and C) for Reduced Fan Volumes
120
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40
20
0
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80 100 120 140 160 180
120
100
80
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20
0
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Volume %
Volume %
INPUT POWER % PRESSURE %
SYSTEM CURVE
FAN CURVE
A
B
C
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ENERGY
CONSUMED
Illustration 2: Energy Savings with Drive Solution
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Product Overview
VLT® Flow Drive FC 111
Design Guide