64
•
VACON
P
ARAMETER
DESCRIPTIONS
Tel. +358 (0)201 2121 • Fax +358 (0)201 212 205
10
2 = Programmable U/f curve:
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 10.2: Programmable U/f curve
3.7 F
IELD
WARKENING
POINT
The field weakening point is the output frequency at which the output voltage
reaches the value set with parameter 3.8.
3.8 V
OLTAGE
AT
FIELD
WEAKENING
POINT
The field weakening point is the output frequency at which the output voltage
reaches the value set with parameter 3.8.
Above the frequency at the field weakening point, the output voltage remains
at the value set with this parameter. Below the frequency at field weakening
point, the output voltage depends on the setting of the U/f curve parameters.
When parameters 1.1 and 1.2 (nominal voltage and nominal frequency of the
motor) are set, parameters 3.7 and 3.8 are given the corresponding values au-
tomatically. If you need different values for the field weakening point and volt-
age, change these parameters after setting parameters 1.1 and 1.2.
3.9 U/F
O
PTIMIZATION
0 = Not used
1 = Automatic Torque Boost
