vacon • 94 Parameters
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
7.1.2.5 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 resis-
tance 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.
Figure 33. I/f start
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 starting 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 62. Open loop settings
Code Parameter Min Max Unit Default ID Description
Motor Current
Time
[s]
I/
f Start
Frequency
I/
f Start Current
Output Frequency
9240.emf
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