User`s manual

apfiff09 marine vacon • 161
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P2.8.3.3 Field weakening point ID602
The field weakening point is the output frequency at which the output voltage reaches the
field weakening point voltage.
P2.8.3.4 Voltage at field weakening point ID603
Above the frequency at the field weakening point, the output voltage remains at the set
maximum value. Below the frequency at the field weakening point, the output voltage
depends on the setting of the U/f curve parameters.
When the parameter Motor nominal frequency is set, the parameter Field weakening
point is automatically given the corresponding value. If you need different values for the
field weakening point and the maximum output voltage, change these parameters after
setting the Nominal frequency .
In closed loop control this defines maximum voltage to the motor, can be increases if
sufficient DC voltage is available.
P2.8.3.5 U/f curve, middle point frequency ID604
If the programmable U/f curve has been selected with parameter U/f ratio this
parameter defines the middle point frequency of the curve. See also parameter Middle
point voltage .
When the programmable U/f curve is selected this value is set to 10 % of motor nominal
frequency.
P2.8.3.6 U/f curve, middle point voltage ID605
If the programmable U/f curve has been selected with the parameter U/f ratio this
parameter defines the middle point voltage of the curve. See also parameter Middle
point frequency .
When the programmable U/f curve is selected this value is set to 10 % (of motor nominal
voltage).
P2.8.3.7 Output voltage at zero frequency ID606
This parameter defines the zero frequency voltage of the U/f curve. The default value is
unit size dependent.
NOTE: If the value of parameter U/f Ratio Select is changed this parameter is set to zero.