User manual

Un
Par. 1.11
U[V]
f[H z ]
Pa r. 1.13
Par. 1.14
Default: Nominal
voltage of the motor
Field weakening
point
Default: Nominal
frequency of the
motor
Pa r. 1.12 Par. 1.10
parameter descriptions vacon • 101
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9
Figure 9.2: Programmable U / f curve
1.10 FIELD WEAKENING POINT
The field weakening point is the output frequency at which the output voltage
reaches the value set with par. 1.11.
1.11 FIELD WEAKENING POINT VOLTAGE
Above the frequency at the field weakening point, the output voltage remains
at the value set with this parameter. Below the frequency at the field weaken-
ing point, the output voltage depends on the setting of the U / f curve param-
eters. See parameters 1.9-1.14 and Figures 9.1 and 9.2.
When the parameters 1.1 and 1.2 (nominal voltage and nominal frequency of
the motor) are set, the parameters 1.10 and 1.11 are automatically given the
corresponding values. If you need different values for the field weakening
point and the voltage, change these parameters after setting the parameters
1.1 and 1.2.
1.12 U / F MIDDLE POINT FREQUENCY
If the programmable U / f curve has been selected with the parameter 1.9, this
parameter defines the middle point frequency of the curve. See Figure 9.2.
1.13 U / F MIDDLE POINT VOLTAGE
If the programmable U / f curve has been selected with the parameter 1.9, this
parameter defines the middle point voltage of the curve. See Figure 9.2.
1.14 ZERO FREQUENCY VOLTAGE
This parameter defines the zero frequency voltage of the curve. See Figures
9.1 and 9.2.