the width of the resonance peak. In most
situations, it is possible to hear the resonance.
4.2 Energy Saving Examples
4.2.1 Why use a Frequency Converter for
Controlling Fans and Pumps?
A frequency converter takes advantage of the fact that
centrifugal fans and pumps follow the laws of propor-
tionality for such fans and pumps. For further information
see
chapter 4.2.3 Example of Energy Savings
4.2.2 The Clear Advantage - Energy Savings
The 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.
SYSTEM CURVE
FAN CURVE
PRESSURE%
130BA780.10
A
B
C
0
20
40
60
80
100
120
20
40
60
80
100
120
140
160
180
VOLUME%
Illustration 4.5 The graph is Showing Fan Curves (A, B, and C)
for Reduced Fan Volumes.
120
100
80
60
40
20
0
20
40
60
80
100
120
140
160
180
120
100
80
60
40
20
0
20
40
60
80
100 120
140
160 180
Voume %
Voume %
INPUT POWER %
PRESSURE %
SYSTEM CURVE
FAN CURVE
A
B
C
130BA781.10
ENERGY
CONSUMED
Illustration 4.6 When using a frequency converter to reduce
fan capacity to 60% - more than 50% energy savings may be
obtained in typical applications.
Application Examples
VLT
®
DriveMotor FCP 106 and FCM 106 Design Guide
38
MG03M102 -
08/2015
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