Danfoss VLT AutomationDrive FC 302, Programming Manual, Page: 57 / 346

1-52 Min Speed Normal Magnetising [Hz]
Range: Function:
Size
related
*
[ 0 -
250.0 Hz] Set the required frequency for normal
magnetizing current. If the frequency is
set lower than the motor slip frequency,
parameter 1-50 Motor Magnetisation at
Zero Speed
is inactive.
Use this parameter along with
parameter 1-50 Motor Magnetisation at
Zero Speed
. See Illustration 3.7 .
3.2.9 1-53 Model Shift Frequency
1-53 Model Shift Frequency
Range: Function:
Size
related
*
[ 4 -
18.0
Hz]
NOTICE
This parameter cannot be adjusted
while the motor is running.
Flux model shift
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 the following options:
•
Shift between flux model 1 and flux
model 2.
•
Shift between variable current mode
and flux model 2.
•
No shift between models at low
speed if
parameter 40-50 Flux
Sensorless Model Shift is set to option
[0] Off .
NOTICE
This is valid for FC 302 only.
Flux model 1 – flux model 2
This model is used when
parameter 1-00 Configuration Mode is set to [1]
Speed closed loop or [2] Torque , and
parameter 1-01 Motor Control Principle is set to
[3] Flux w/motor feedback . With this parameter,
it is possible to make an adjustment of the
shifting point where the frequency converter
changes between flux model 1 and flux
model 2, which is useful in some sensitive
speed and torque control applications.
1-53 Model Shift Frequency
Range: Function:
P 1-53
130BA146.11
f
out
f
N,M
x 0.125 f
N,M
x 0.1
Flux model 2 Flux model 1
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
norm
x 0.1, the frequency converter
runs on a variable current model. Above f
norm
x 0.125 the frequency converter runs on a flux
model.
P 1-53
130BA147.10
x 0.1
Variable
current
model
Flux model 2
f
out
f
N,M
f
N,M
x 0.125
Illustration 3.9 Parameter 1-00 Configu-
ration Mode = [0] Speed open loop,
parameter 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 reduces the
maximum voltage available for the flux of the
motor in field weakening, providing more
voltage for torque. Increasing the value
increases the risk of stalling at high speed.
Parameter Descriptions Programming Guide
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