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Multi-purpose Control Application IIMulti-purpose Control Application II
Multi-purpose Control Application IIMulti-purpose Control Application II
Multi-purpose Control Application II
6. 2 6. 2
6. 2 6. 2
6. 2
Switching frequencySwitching frequency
Switching frequencySwitching frequency
Switching frequency
Motor noise can be minimized using a high switching frequency. Increasing the
switching frequency reduces the capacity of the frequency converter unit.
Before changing the frequency from the factory default 10 kHz (3.6 kHz from 30 kW
upwards), check the allowed capacity from the curve in the figure 5.2-3 of chapter
5.2 of the User's Manual.
6. 36. 3
6. 36. 3
6. 3
Field weakening pointField weakening point
Field weakening pointField weakening point
Field weakening point
6. 46. 4
6. 46. 4
6. 4
VV
VV
V
oltage at the field weakening pointoltage at the field weakening point
oltage at the field weakening pointoltage at the field weakening point
oltage at the field weakening point
The field weakening point is the output frequency at which the output voltage reaches
the set maximum value (par. 6
..
..
. 4). Above that frequency the output voltage remains
at the set maximum value.
Below that frequency the output voltage depends on the setting of the U/f curve
parameters 1
..
..
. 8, 1
..
..
. 9, 6
..
..
. 5, 6
..
..
. 6 and 6
..
..
. 7. See figure 6-25.
When the parameters 1
..
..
. 10 and 1
..
..
. 11, nominal voltage and nominal frequency of
the motor, are set, also parameters 6
..
..
. 3 and 6
..
..
. 4 are set automatically to the
corresponding values. If different values for the field weakening point and
the maximum output voltage are required, change these parameters
after setting
the parameters 1
..
..
. 10 and 1
..
..
. 11.
6. 56. 5
6. 56. 5
6. 5
U/f curve, middle point frequencyU/f curve, middle point frequency
U/f curve, middle point frequencyU/f curve, middle point frequency
U/f curve, middle point frequency
If the programmable U/f curve has been selected with the parameter 1
..
..
. 8 this
parameter defines the middle point frequency of the curve. See figure 6-25.
6. 66. 6
6. 66. 6
6. 6
U/f curve, middle point voltageU/f curve, middle point voltage
U/f curve, middle point voltageU/f curve, middle point voltage
U/f curve, middle point voltage
If the programmable U/f curve has been selected with the parameter 1
..
..
. 8 this
parameter defines the middle point voltage of the curve. See figure 6-25.
6. 76. 7
6. 76. 7
6. 7
Output voltage at zero frequencyOutput voltage at zero frequency
Output voltage at zero frequencyOutput voltage at zero frequency
Output voltage at zero frequency
If the programmable U/f curve has been selected with the parameter 1
..
..
. 8 this
parameter defines the zero frequency voltage of the curve. See figure 6-25.
Figure 6-25 Programmable U/f curve.
Un
Par 6. 4
Par. 6. 3
U[V]
f[Hz]
UD012K08
Par. 6. 5
(Def. 5 Hz)
Par. 6. 6
(Def. 10%)
Par. 6. 7
(Def. 1.3%)
Default: Nominal
voltage of the motor
Field weakening
point
Default: Nominal
frequency of the
motor
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