Danfoss VLT AutomationDrive FC 302 Programming Manual page 48

Parameter Descriptions
1-53 Model Shift Frequency
Range:
3 3
46
VLT
Function:
Enter the frequency value for shift between 2
models for determining motor speed. Select
the value based on settings in
parameter 1-00 Configuration Mode and
parameter 1-01 Motor Control Principle. There
are 2 options: shift between Flux model 1 and
Flux model 2; or shift between Variable
Current mode and Flux model 2. FC 302 only.
Flux Model 1 – Flux model 2
This model is used when
parameter 1-00 Configuration Mode is set to
Speed closed loop [1] or Torque [2] and
parameter 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.
f x 0.1 f x 0.125
N,M N,M
Flux model 1 Flux model 2
f
P 1-53
Illustration 3.8 Parameter 1-00 Configu-
ration Mode = [1] Speed closed loop or [2]
Torque and parameter 1-01 Motor Control
Principle = [3] Flux w/motor feedback
Variable Current - Flux model - Sensorless
This model is used when
parameter 1-00 Configuration Mode is set to
[0] Speed open loop and parameter 1-01 Motor
Control Principle is set to [2] Flux sensorless.
In speed open loop in flux mode, the speed is
determined from the current measurement.
Below f x 0.1, the frequency converter
norm
runs on a Variable Current model. Above f
x 0.125 the frequency converter runs on a
Flux model.
f f
x 0.1 x 0.125
N,M N,M
Variable
current Flux model 2
model
P 1-53
Illustration 3.9 Parameter 1-00 Configu-
ration Mode = [0] Speed open loop,
parameter 1-01 Motor Control Principle =
[2] Flux sensorless
®
AutomationDrive FC 301/302 Programming Guide
1-54 Voltage reduction in fieldweakening
Range:
0 V [0 - 100
*
V]
1-55 U/f Characteristic - U
Range:
Size
related
*
1-56 U/f Characteristic - F
Range:
Size
related 1000.0
*
Hz]
out
Motor Voltage
Par 1-55 [x]
1-55[5]
1-55[4]
1-55[3]
1-55[2]
norm
1-55[1]
1-55[0]
1-56
[0]
Illustration 3.10 U/f Characteristic
f
out
1-58 Flystart Test Pulses Current
Range:
Size
related
*
MG33MI02 - Rev. 2013-11-20
Function:
The value of this parameter reduces 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:
[0 - Enter the voltage at each frequency point
1000 V] to manually form a U/f characteristic
matching the motor.
The frequency points are defined in
parameter 1-56 U/f Characteristic - F.
This parameter is an array parameter [0-5]
and is only accessible when
parameter 1-01 Motor Control Principle is set
to [0] U/f.
Function:
[ 0 - Enter the frequency points to manually
form a U/f-characteristic matching the
motor.
The voltage at each point is defined in
parameter 1-55 U/f Characteristic - U.
This parameter is an array parameter [0-5]
and is only accessible when
parameter 1-01 Motor Control Principle is
set to [0] U/f.
1-56
1-56 1-56
[1]
[2] [3]
Function:
[ 0 - Sets the current level for the flystart test
200 %] pulses that are used to detect the motor
direction. 100% means I
value to be big enough to avoid noise
1-56
1-56
[5]
[4]
Output Frequency
Par 1-56 [x]
. Adjust the
m,n