Danfoss VLT AQUA Drive Design Manual page 18

2. Introduction to the VLT AQUA Drive
Pump characteristics
2
3
m
350
300
250
200
150
100
Σ
2.7.5. Better control
If an adjustable frequency drive is used for controlling the flow or pressure of a system, improved
control is obtained.
An adjustable frequency drive can vary the speed of the fan or pump, thereby 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.
Simple control of process (flow, level or pressure) utilizing the built-in PID control.
18
Distribution
/h
% Hours
5 438
15 1314
20 1752
20 1752
20 1752
20 1752
100 8760
MG.20.N2.22 - VLT
Energy savings
P =P
shaft shaft output
Flow distribution over 1 year
Valve regulation
Power Consumption
A - B kWh
1 1
42,5 18.615
38,5 50.589
35,0 61.320
31,5 55.188
28,0 49.056
23,0 40.296
275.064
® is a registered Danfoss trademark.
VLT ® AQUA Drive Design Guide
Adjustable frequency drive
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