Power Factor - Danfoss VLT AutomationDrive FC 300 Design Manual

How to Read this Design Gui...

1.7 Power Factor

The power factor is the relation between I
3 × U × I 1 × COS ϕ
Power factor =
U × I RMS
3 ×
The power factor for 3-phase control:
I 1 × cos ϕ1 I 1
= = since cos ϕ1 = 1
I RMS I RMS
The power factor indicates to what extent the frequency
converter imposes a load on the mains supply.
The lower the power factor, the higher the I
same kW performance.
I RMS = I 1 2 + I 5 2 + I 7 2 + . . + I n 2
In addition, a high power factor indicates that the different
harmonic currents are low.
The built-in DC coils produce a high power factor, which
minimizes the imposed load on the mains supply.
®
VLT AutomationDrive FC 300 Design Guide 90-1200 kW
and I .
1 RMS
for the
RMS
MG34S202 - Rev. 2013-08-19
1 1
13