Danfoss VLT HVAC Design Manual page 23

®
VLT HVAC Drive Design Guide
3 Distribution
m /h
%
350 5
300 15
250 20
200 20
150 20
100 20
Σ 100
2.7.6 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.
2.7.7 Cos φ Compensation
Generally speaking, the AKD102 have a cos φ of 1 and provides power factor correction for the cos φ of the motor, which means that there is no need
to make allowance for the cos φ of the motor when sizing the power factor correction unit.
Valve regulation
Hours Power Consumption
A - B
1 1
438 42,5
1314 38,5
1752 35,0
1752 31,5
1752 28,0
1752 23,0
8760
MG.11.B9.02 - VLT ® is a registered Danfoss trademark
2 Introduction to VLT HVAC Drive
Frequency converter control
Power
kWh A - C
1
18.615 42,5
50.589 29,0
61.320 18,5
55.188 11,5
49.056 6,5
40.296 3,5
275.064
Consumption
kWh
1
18.615
38.106
32.412
20.148
11.388
6.132
26.801
2
23