26 • vacon
description of parameters
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Figure 6. Linear and squared change of motor voltage
Programmable U/f curve:
2
The U/f curve can be programmed with three different points.
Programmable U/f curve can be used if the other settings do not satisfy the
needs of the application.
Figure 7. Programmable U/f curve.
Linear with flux optimisation:
3
The frequency converter starts to search for the minimum motor current in
order to save energy, lower the disturbance level and the noise. This function
can be used in applications with constant motor load, such as fans, pumps
etc.
2.5.4
Field weakening point
The field weakening point is the output frequency at which the output voltage reaches
the set (
U n
pa r.2.5.5
U [V ]
f[H z]
N X12K07
D e fa u lt: N o m in al
volta g e of the m oto r
L in e a r
S q u a re d
F ield w e a ken in g
p oint
D e fau lt: N o m in a l
fre q u e n c y o f th e
m o to r
U
n
P
a
r
2
.
5
.
5
Par. 2.5
.
4
U
[
V
]
f[H
z
]
NX12
K
0
8
P
a
r
.
2
.
5
.
6
(
D
e
f
.
5
H
z)
P
a
r
.
2
.
5
.
7
(
D
e
f
.
1
0
%
)
P
a
r
.
2
.
5
.
8
(
D
e
f
.
1
.
3
%
)
D
e
f
a
u
l
t
:
N
o
m
i
n
al
v
o
l
t
a
g
e
o
f
t
h
e
motor
Field weakening point
Default: Nominal
frequency of the moto
r
