•
•
•
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
.
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 adjust-
ment of the shifting point where the drive changes between flux model 1 and flux model 2, which is useful in some sensitive speed
and torque control applications.
P 1-53
e
3
0
b
a
1
4
6
.1
2
f
out
f
N,M
x 0.125
f
N,M
x 0.1
Flux model 2
Flux model 1
Illustration 30: Example of Parameter 1-00 Configuration Mode = [1] Speed closed loop or [2] Torque and parameter 1-01 Motor Control Princi-
ple = [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 drive runs on a variable current model. Above f
norm
x 0.125 the drive runs on a flux
model.
P 1-53
e
3
0
b
a
1
4
7
.1
1
x 0.1
Variable
current
model
Flux model 2
f
out
f
N,M
f
N,M
x 0.125
Illustration 31: Parameter 1-00 Configuration Mode = [0] Speed open loop, parameter 1-01 Motor Control Principle = [2] Flux sensorless
Parameter 1-54 Voltage Reduction in Fieldweakening
Table 107: Parameter 1-54 Voltage reduction in fieldweakening
1-54 Voltage reduction in fieldweakening
Default value: 0 V
Parameter type: Range, -50 - 100 V
Setup: All setups
Conversion index: 0
Data type: Int8
Change during operation: False
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 1-55 U/f Characteristic - U
Table 108: Parameter 1-55 U/f Characteristic - U
1-55 U/f Characteristic - U
Default value: Size related
Parameter type: Range, 0 - 1000 V, Array [6]
Setup: All setups
Conversion index: -1
Data type: Uint16
Change during operation: True
Enter the voltage at each frequency point to manually form a U/f characteristic matching the motor. The frequency points are de-
fined 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
.
Parameter 1-56 U/f Characteristic - F
Table 109: Parameter 1-56 U/f Characteristic - F
1-56 U/f Characteristic - F
Default value: Size related
Parameter type: Range, 0 - 1000.0 V, Array [6]
Setup: All setups
Conversion index: -1
Data type: Uint16
Change during operation: True
AU373327181955en-000101 / 130R1208
78 | Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide