Danfoss VLT AutomationDrive FC 300 Programming Manual page 40

Parameter Descriptions
1-53 Model Shift Frequency
Range: Function:
between Flux model 1 and Flux
model 2; or shift between Variable
Current mode and Flux model 2.FC
302 only.
This parameter cannot be adjusted
while the motor is running.
Flux Model 1 – Flux model 2
This model is used when 1-00 Config-
uration Mode is set to Speed closed
loop [1] or Torque [2] and 1-01 Motor
Control Principle is set to Flux w/motor
feedback [3]. With this parameter 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 1-00 Configuration
Mode = [1] Speed closed loop or [2]
Torque and 1-01 Motor Control
Principle = [3] Flux w/motor
feedback
Variable Current - Flux model -
Sensorless
This model is used when 1-00 Config-
uration Mode is set to Speed open
loop [0] and 1-01 Motor Control
Principle is set to Flux sensorless [2].
In speed open loop in flux mode, the
speed is determined from the current
measurement.
Below f
converter runs on a Variable Current
model. Above f
frequency converter runs on a Flux
model.
FC 300 Programming Guide
f x 0.1 f x 0.125
N,M N,M
Flux model 1 Flux model 2
f
P 1-53
out
x 0.1, the frequency
norm
x 0.125 the
norm
®
MG.33.MB.02 - VLT is a registered Danfoss trademark
1-53 Model Shift Frequency
Range: Function:
Variable
current
model
Illustration 3.3 1-00 Configuration
Mode = [0] Speed open loop,
1-01 Motor Control Principle = [2]
Flux sensorless
1-54 Voltage reduction in fieldweakening
Range: Function:
0 V [0 - 100 V] 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.
1-55 U/f Characteristic - U
Range: Function:
Application [0.0 - Enter the voltage at each frequency
dependent 1000.0 V] point to manually form a U/f charac-
*
teristic matching the motor.
The frequency points are defined in
1-56 U/f Characteristic - F.
This parameter is an array
parameter [0-5] and is only
accessible when 1-01 Motor Control
Principle is set to U/f [0].
1-56 U/f Characteristic - F
Range:
Application [Application
dependent dependant]
*
f f
x 0.1 x 0.125
N,M N,M
Flux model 2
f
P 1-53
out
Function:
Enter the frequency points to
manually form a U/f-charac-
teristic matching the motor.
The voltage at each point is
defined in 1-55 U/f Characteristic -
U.
This parameter is an array
parameter [0-5] and is only
accessible when 1-01 Motor
Control Principle is set to U/f [0].
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