Parameters vacon • 70
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6
6.1.2.5 Group 3.1.4.12: I/f start
The I/f Start function is typically used with permanent magnet synchronous motors (PMSM) to
start the motor with constant current control. This is useful with high power motors in which
the resistance is low and the tuning of the U/f curve difficult.
The
I/f Start function can be used with induction motors (IM), too, e.g. if the tuning of the U/f
curve is difficult at low frequencies.
Applying the I/f Start function may also prove useful in providing sufficient torque for the motor
at startup.
P3.1.4.3 Voltage at FWP 10.00 200.00 % 100.00 603
Voltage at field weakening
point in % of motor nominal
voltage
P3.1.4.4 U/f Mid Freq 0.00 P3.1.4.2 Hz Varies 604
Provided that the program-
mable U/f curve has been
selected (par. P3.1.4.1) , this
parameter defines the mid-
dle point frequency of the
curve.
P3.1.4.5 U/f Mid Voltg 0.0 100.0 % 100.0 605
Provided that the program-
mable U/f curve has been
selected (par. P3.1.4.1), this
parameter defines the mid-
dle point voltage of the
curve.
P3.1.4.6 Zero Freq Voltg 0.00 40.00 % Varies 606
This parameter defines the
zero frequency voltage of
the U/f curve. The default
value varies according to
unit size.
P3.1.4.7 Flying Start Options 0 1 0 1590
Checkbox selection:
B0 = Search shaft frequency
from same direction as fre-
quency reference.
B1 = Disable AC scanning
B4 = Use frequency refer-
ence for initial guess
B5 = Disable DC pulses
P3.1.4.8 FlyStartScanCurrent 0.0 100.0 % 45.0 1610
Defined in percentage of
motor nominal current.
P3.1.4.9 Auto TorqueBoost 0 1 0 109
Automatic torque boost can
be used in application where
starting torque due to start-
ing friction is high.
0= Disabled
1= Enabled
P3.1.4.10
Torque boost motor
gain
0.0 100.0 % 100.0 667
Scaling factor for motoring
side IR-compensation when
torque boost is used.
P3.1.4.11
Torque boost genera-
tor gain
0.0 100.0 % 0.0 665
Scaling factor for generating
side IR-compensation when
torque boost is used.
Table 48. Open loop settings
Code Parameter Min Max Unit Default ID Description
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