Danfoss VLT AutomationDrive FC 301 Programming Manual page 54

Parameter Descriptions
1-53 Model Shift Frequency
Range:
Size [ 4 -
related 18.0
*
Hz]
3 3
52
®
VLT
Function:
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 2 options:
•
Shift between Flux model 1 and Flux
model 2, or
•
Shift between Variable Current mode
and Flux model 2.
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.
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.
Danfoss A/S © 02/2016 All rights reserved.
AutomationDrive FC 301/302
1-53 Model Shift Frequency
Range:
1-54 Voltage reduction in fieldweakening
Range:
0 V [0 - 100
*
V]
1-55 U/f Characteristic - U
Array [6]
Range:
Size
related
*
1-56 U/f Characteristic - F
Array [6]
out
Range:
Size
related
*
norm
Function:
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
Function:
The value of this parameter reduces the
maximal voltage available for the flux of the
motor in field weakening, giving more voltage
available for torque. An excessive value may
cause 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
1000.0 Hz] 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.
f
out
MG33ML02