Danfoss VLT AutomationDrive FC 301 Programming Manual page 48

Parameter Descriptions
1-52 Min Speed Normal Magnetising [Hz]
Range:
3 3
1-53 Model Shift Frequency
Range:
0 [4.0 -
Hz 0 Hz]
*
46
VLT
Function:
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.
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 Configu-
ration 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 Configu-
ration 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
P 1-53
Illustration 3.8 Parameter 1-00 Configuration
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
Danfoss A/S © 01/2018 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:
0 V [0.0 -
*
1000.0 V]
1-56 U/f Characteristic - F
Array [6]
Range:
f
0 Hz [0 -
out *
1000.0 Hz]
Function:
This model is used when parameter 1-00 Configu-
ration 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 runs on
norm
a variable current model. Above f
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 Configuration
Mode = [0] Speed open loop,
parameter 1-01 Motor Control Principle = [2]
Flux sensorless
Function:
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.
Function:
Enter the voltage at each frequency point 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:
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.
x 0.125 the
norm
f
out
MG33MO02