VVC
plus
If compared with standard voltage/frequency ratio control, Voltage Vector Control (VVC
plus
) improves the dy-
namics and the stability, both when the speed reference is changed and in relation to the load torque.
60° AVM
Switching pattern called 60°
Asynchronous Vector Modulation (par.14-00 Switching Pattern).
Power Factor
The power factor is the relation between I
1
and
I
RMS
.
Power
factor
=
3
x
U
x
I
1
cos
ϕ
3
x
U
x
I
RMS
The power factor for 3-phase control:
=
I
1
x
cos
ϕ1
I
RMS
=
I
1
I
RMS
since
cos
ϕ1 = 1
The power factor indicates to which extent the fre-
quency converter imposes a load on the mains sup-
ply.
The lower the power factor, the higher the I
RMS
for
the 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 frequency converters' built-in DC coils produce a high power factor, which minimizes the imposed load on
the mains supply.
Introduction
16 TR200 Programming Guide
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