Danfoss VLT AutomationDrive FC 301 Programming Manual page 66

Parameter Descriptions
1-53 Model Shift Frequency
Range:
3 3
1-54 Voltage reduction in fieldweakening
Range:
0 V
*
64
Function:
f x 0.1 f
N,M N,M
Flux model 1 Flux model 2
P 1-53
Illustration 3.8 Parameter 1-00 Co
nfiguration 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
norm
converter runs on a variable current
model. Above f
norm
frequency converter runs on a flux
model.
f f
x 0.1
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:
[-50 - 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.
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®
VLT AutomationDrive FC 301/302
1-55 U/f Characteristic - U
Array [6]
Range:
x 0.125
Size
related
*
f
out
1-56 U/f Characteristic - F
Array [6]
Range:
Size
related
*
x 0.125 the
Motor Voltage
Par 1-55 [x]
x 0.125
1-55[5]
1-55[4]
1-55[3]
f
out
1-55[2]
1-55[1]
1-55[0]
1-56
[0]
Illustration 3.10 U/f Characteristic
1-57 Torque Estimation Time Constant
Range:
150 ms
*
Function:
[0 - 1000 V] 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:
[ 0 - 1000.0 Enter the frequency points to form
Hz] a U/f characteristic manually
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 1-56
[1] [2] [3] [4]
Output Frequency
Par 1-56 [x]
Function:
NOTICE
[50 - 1000
ms]
This parameter is only valid
with software version 48.XX.
Enter the time constant for the
torque estimation below model
1-56
[5]
M0013101