description of parameters vacon • 33
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7
Squared:
1
The voltage of the motor changes followiing a squared curve form with the
frequency in the area from 0 Hz to the field weakening point where the nomi-
nal voltage is also supplied to the motor. The motor runs undermagnetised
below the field weakening point and produces less torque and electro-
mechanical noise. Squared U/f ratio can be used in applications where torque
demand of the load is proportional to the square of the speed, e.g. in
centrifugal fans and pumps.
Figure 2. Linear and squared change of motor voltage
Programmable U/f curve:
2 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 3. Programmable U/f curve
Linear with flux optimisation:
3 The frequency converter starts to search for the minimum motor current in
order to save energy, lower the disturbance level and the noise. This function
can be used in applications with constant motor load, such as fans, pumps
etc.
Un
ID603
U[V]
f[Hz]
NX12K07
Default: Nominal
voltage of the motor
Linear
Squared
Field weakening
point
Default: Nominal
frequency of the
motor
Un
ID603
ID602
U[V]
f[Hz]
NX12K08
ID604
(Def. 5 Hz)
ID605
(Def. 10%)
ID606
(Def. 1.3%)
Default: Nominal
voltage of the motor
Field weakening point
Default: Nominal
frequency of the motor
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