Power Factor - Danfoss VLT Micro Drive FC 51 Design Manual

Introduction
1 1
VT characteristics
Variable torque characteristics used for pumps and fans.
+
VVC
If compared with standard voltage/frequency ratio control,
voltage vector control (VVC
the stability, both when the speed reference is changed
and in relation to the load torque.

1.5 Power Factor

The power factor is the relation between I
3 × U × I
Power factor =
3 × U × I
The power factor for 3-phase control:
I × cosϕ1
1
=
Power factor
I
RMS
The power factor indicates to which extent the frequency
converter imposes a load on the supply.
The lower the power factor, the higher the I
same kW performance.
2 2 2
I I I I
= + + + . . +
RMS 1 5 7
In addition, a high-power factor indicates that the different
harmonic currents are low.
8
VLT
+
) improves the dynamics and
and I
1
1 × COSϕ
RMS
I
1
= since cosϕ1 = 1
I
RMS
RMS
2
I
n
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®
Micro Drive FC 51
.
RMS
for the
MG02K402