Danfoss FC 100 Series Spécifications Page 12
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
2.5 Advantages
2.5.1 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 2.4.3 Example of Energy Savings.
2.5.2 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.
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 2.1 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 2.2 When using a frequency converter to reduce fan
capacity to 60% - more than 50% energy savings may be
obtained in typical applications.
2.5.3
Example of Energy Savings
As shown in Illustration 2.3, the flow is controlled by
changing the RPM. By reducing the speed only 20% from
the rated speed, the flow is also reduced by 20%. This is
because the flow is directly proportional to the RPM. The
consumption of electricity, however, is reduced by 50%.
If the system in question only needs to be able to supply a
flow that corresponds to 100% a few days in a year, while
the average is below 80% of the rated flow for the
remainder of the year, the amount of energy saved is even
more than 50%.
The laws of proportionality
Illustration 2.3 describes the dependence of flow, pressure and
power consumption on RPM.
Q = Flow P = Power
Q
1
= Rated flow P
1
= Rated power
Q
2
= Reduced flow P
2
= Reduced power
H = Pressure n = Speed regulation
H
1
= Rated pressure n
1
= Rated speed
H
2
= Reduced
pressure
n
2
= Reduced speed
Introduction to VLT HVAC Ba... VLT HVAC Basic Drive Design Guide
MG.18.C2.02 - VLT
®
is a registered Danfoss trademark 11
2 2
- Design Guide 1
- MG.18.C2.02 - VLT 2
- 2 MG.18.C2.02 - VLT 3
- Revision Rights 4
- Basic Drive 4
- 1.1.4 Abbreviations 5
- 1.1.5 Definitions 6
- 6 MG.18.C2.02 - VLT 7
- Power Factor 8
- DANGEROUS VOLTAGE 9
- UNINTENDED START 9
- DISCHARGE TIME 9
- IEC/EN 60068-2-6: 11
- Vibration (sinusoidal) - 1970 11
- 10 MG.18.C2.02 - VLT 11
- Comparison of Energy Savings 13
- Without a Frequency Converter 15
- Application Examples 16
- 2.5.12 Variable Air Volume 16
- 2.5.13 The VLT Solution 17
- 2.5.14 Constant Air Volume 18
- 2.5.15 The VLT Solution 18
- 2.5.16 Cooling Tower Fan 19
- 2.5.17 The VLT Solution 19
- 2.5.18 Condenser Pumps 20
- 2.5.19 The VLT Solution 20
- 2.5.20 Primary Pumps 21
- 2.5.21 The VLT Solution 22
- 2.5.22 Secondary Pumps 23
- 2.5.23 The VLT Solution 23
- 2.6 Control Structures 24
- Feedback Conversion 25
- 2.6.5 Reference Handling 26
- 26 MG.18.C2.02 - VLT 27
- 28 MG.18.C2.02 - VLT 29
- 2.6.8 Manual PI Adjustment 31
- 2.7 General Aspects of EMC 31
- 2.7.2 Emission Requirements 32
- 2.7.3 EMC Test Results 33
- Emission 34
- = 3 × 120 × 400 × 35
- 175ZA052.12 36
- <800 Ω >2.9 kΩ 37
- R1.5 +_ 0.5 38
- 130BB778.10 39
- 130BB902.10 40
- 130BB903.10 40
- 3.1.4 Decoupling Plate 41
- 130BB793.10 41
- 4 How to Order 42
- 4.1.2 Type Code String 43
- 4.2.2 Harmonic Filters 45
- External RFI Filter 45
- 5 How to Install 46
- 5.1.2 Field Mounting 48
- 5.2 Electrical Data 48
- 5.2.1 Electrical Overview 48
- L1 91 / L2 92 / L3 93 51
- U 96 / V 97 / W 98 51
- 5.2.4 Fuses 51
- 130BB761.10 53
- 5.2.6 Control Terminals 54
- 6 How to Programme 55
- 56 MG.18.C2.02 - VLT 57
- Closed Loop Set-up Wizard 60
- Main Menu 62
- 62 MG.18.C2.02 - VLT 63
- 7.1.1 Network Connection 65
- 7.4.7 The PKE Field 68
- 96 and length 4 would 75
- 96 and length 75
- 80 MG.18.C2.02 - VLT 81
- 8.1 Mains Supply Tables 82
- 130BB632.10 83
- 8.2 General Specifications 87
- 8.3 Acoustic Noise 89
- 90 MG.18.C2.02 - VLT 91
- *MG18C202* 93
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