Danfoss VLT AutomationDrive FC 300 Programming Manual page 54

FC 300 Programming Guide
1-54 Voltage reduction in fieldweakening
Range:
0 V* [0 - 100 V]
1-55 U/f Characteristic - U
Range:
Application [0.0 - 1000.0 V]
dependent*
This model is used when par. 1-00
Motor Control Principle
[2] and par. 1-01
it is possible to make an adjustment of the shifting point where FC 302 changes between Flux model
1 and Flux model 2, which is useful in some sensitive speed and torque control applications.
Illustration 3.2: Par. 1-00 Configuration Mode
and par. 1-01 Motor Control Principle
Variable Current - Flux model - Sensorless
This model is used when par. 1-00
Motor Control Principle
par. 1-01 is set to
In speed open loop in flux mode, the speed is determined from the current measurement.
Below f x 0.1, the frequency converter runs on a Variable Current model. Above f
norm
the frequency converter runs on a Flux model.
Illustration 3.3: par. 1-00 Configuration Mode
Control Principle
= [2] Flux sensorless
Function:
The value of this parameter will reduce the maximal voltage available for the flux of the motor in
fieldweakning, giving more voltage available for torque. Be aware that too high value may give stall
problems at high speed.
Function:
Enter the voltage at each frequency point to manually form a U/f characteristic matching the motor.
The frequency points are defined in par. 1-56
This parameter is an array parameter [0-5] and is only accessible when par. 1-01
Principle is set to U/f [0].
®
MG.33.M8.02 - VLT is a registered Danfoss trademark
3 Parameter descriptions
Configuration Mode Speed closed loop
is set to
Flux w/motor feedback
is set to
= [1] Speed closed loop or [2] Torque
= [3] Flux w/motor feedback
Configuration Mode Speed open loop
is set to
Flux sensorless
[2].
= [0] Speed open loop, par. 1-01
U/f Characteristic - F
.
Torque
[1] or
[3]. With this parameter
3
[0] and
x 0.125
norm
Motor
Motor Control
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