Vacon 100 - Page 231

P1
P2
P3
ID604
ID605
ID606
Default: Nominal
voltage of the motor
Field weakening point
Default: Nominal
frequency of the motor
Un
ID603
ID602
U[V]
f[Hz]
Fig. 24: The programmable U/f curve
When the parameter Motor Type has the value PM motor (Permanent Magnet Motor), this
parameter is automatically set to the value Linear.
When the parameter Motor Type has the value Induction Motor, and when this parameter is
changed, these parameters are set to their default values.
•
P3.1.4.2 Field Weakening Point Frequency
•
P3.1.4.3 Voltage at Field Weakening Point
•
P3.1.4.4 U/f Midpoint Frequency
•
P3.1.4.5 U/f Midpoint Voltage
•
P3.1.4.6 Zero Frequency Voltage
P3.1.4.3 VOLTAGE AT FIELD WEAKENING POINT (ID 603)
Above the frequency at the field weakening point, the output voltage stays at the set
maximum value. Below the frequency at the field weakening point, the U/f curve parameters
control the output voltage. See the U/f parameters P3.1.4.1, P3.1.4.4 and P3.1.4.5.
When you set the parameters P3.1.1.1 (Motor nominal voltage) and P3.1.1.2 (Motor nominal
frequency), the parameters P3.1.4.2 and P3.1.4.3 automatically receive related values. To
have different values for P3.1.4.2 and P3.1.4.3, change these parameters only after you set
the parameters P3.1.1.1 and P3.1.1.2.
P3.1.4.7 FLYING START OPTIONS (ID 1590)
The parameter Flying Start Options has a checkbox selection of values.
The bits can receive these values.
•
Search the shaft frequency only from the same direction as the frequency reference
•
Disable the AC scanning
•
Use the frequency reference for an initial guess
•
Disable the DC pulses
PARAMETER DESCRIPTIONS VACON · 231
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