Danfoss VLT AQUA Drive FC 202 Design Manual page 20

Product Overview
2 2
[h] t
2000
1500
1000
500
t [h]
Q [m 3 /h]
Figure 2.6 Flow Distribution over 1 Year (Duration versus Flow
Rate)
Figure 2.7 Energy Consumption at Different Speeds
18
100 200 300 400
Duration of flow. See also Table 2.2.
Flow rate
Danfoss A/S © 09/2014 All rights reserved.
®
VLT AQUA Drive FC 202
Flow
rate
3
[m /h]
350
300
Q
[m 3 /h]
250
200
150
100
Σ
Table 2.2 Result
1) Power reading at point A1
2) Power reading at point B1
3) Power reading at point C1
2.1.6 Improved Control
Using an adjustable frequency drive to control the flow or
pressure of a system improves control.
An adjustable frequency drive can vary the speed of the
fan or pump, obtaining variable control of flow and
pressure.
Furthermore, an adjustable frequency drive can quickly
adapt the speed of the fan or pump to new flow or
pressure conditions in the system.
Obtain simple control of process (flow, level, or pressure)
utilizing the built-in PI control.
2.1.7 Star/Delta Starter or Soft Starter
When large motors are started, it is necessary in many
countries to use equipment that limits the start-up current.
In more traditional systems, a star/delta starter or soft
starter is widely used. Such motor starters are not required
if an adjustable frequency drive is used.
As illustrated in Figure 2.8, an adjustable frequency drive
does not consume more than rated current.
Distribution Valve regulation
% Duration Power Consump-
tion
[h] [kW [kWh]
(hp)]
5 438 42.5 18.615
(57) 1)
15 1314 38.5 50.589
(52)
20 1752 35.0 61.320
(47)
20 1752 42 55.188
(31.5)
20 1752 28.0 49.056
(37.5)
20 1752 23.0 40.296
2)
(31)
10 8760 – 275.064
0
Adjustable
frequency drive
control
Power Consump-
tion
[kW [kWh]
(hp)]
42.5 18.615
(57) 1)
29.0 38.106
(39)
25 32.412
(18.5)
11.5 20.148
(15.5)
6.5 11.388
(8.7)
3.5 6.132
3)
(4.7)
– 26.801
MG20N622