Danfoss VLT AQUA Drive Design Manual page 18

2. Introduction to VLT AQUA Drive
2
3
m /
h
350
300
250
200
150
100
Σ
2.7.5. Better control
If a frequency converter is used for controlling the flow or pressure of a system, improved control is obtained.
A frequency converter can vary the speed of the fan or pump, thereby obtaining variable control of flow and pressure.
Furthermore, a frequency converter can quickly adapt the speed of the fan or pump to new flow or pressure conditions in the system.
Simple control of process (Flow, Level or Pressure) utilizing the built in PID control.
18
Distribution
% Hour Power
s
A - B
1
5 438 42,5
15 1314 38,5
20 1752 35,0
20 1752 31,5
20 1752 28,0
20 1752 23,0
100 8760
MG.20.N4.02 - VLT
Valve regulation
Consumption
kWh
1
18.615
50.589
61.320
55.188
49.056
40.296
275.064
®
is a registered Danfoss trademark
®
VLT AQUA Drive Design Guide
Frequency converter control
Power Consumption
A - C kWh
1 1
42,5 18.615
29,0 38.106
18,5 32.412
11,5 20.148
6,5 11.388
3,5 6.132
26.801