Danfoss VLT AutomationDrive FC 301 Programming Manual page 49

Parameter Descriptions
Motor Voltage
Par 1-55 [x]
1-55[5]
1-55[4]
1-55[3]
1-55[2]
1-55[1]
1-55[0]
1-56 1-56 1-56
[0] [1] [2]
Illustration 3.10 U/f Characteristic
1-57 Torque Estimation Time Constant
Range: Function:
NOTICE
150 ms [50 - 1000
*
ms]
This parameter is only valid with
software version 48.XX.
Enter the time constant for the torque
estimation below model change point in
flux sensorless control principle.
1-58 Flying Start Test Pulses Current
Range: Function:
NOTICE
Size [ 0 -
related 200 %]
*
This parameter is only available in
VVC + .
NOTICE
This parameter has effect on PM
motors only.
Sets the current level for the flying start test
pulses that are used to detect the motor
direction. 100% means I
to be high enough to avoid noise influence,
but low enough to avoid affecting the
accuracy (current must be able to drop to 0
before the next pulse). Reduce the value to
reduce the generated torque.
Default is 30% for asynchronous motors, but
may vary for PM motors. For adjusting PM
motors, the value tunes for back EMF and d-
axis inductance of the motor.
1-59 Flying Start Test Pulses Frequency
Range: Function:
Size [ 0 - Asynchronous motor: Set the frequency of
related 500 %] the flying start test pulses that are used to
*
MG33MO02
Programming Guide
1-56
1-56 1-56
[5]
[3] [4]
Output Frequency
Par 1-56 [x]
. Adjust the value
m,n
Danfoss A/S © 01/2018 All rights reserved.
1-59 Flying Start Test Pulses Frequency
Range: Function:
detect the motor direction. For
asynchronous motors, the value 100%
means that the slip is doubled. Increase this
value to reduce the generated torque.
For synchronous motors, this value is the
percentage n
Above this value, flying start is always
performed. Below this value, the start mode
is selected in parameter 1-70 Start Mode
3.2.9 1-6* Load Depend. Setting
1-60 Low Speed Load Compensation
Range: Function:
100 % [0 - Enter the % value to compensate voltage in
*
300 %] relation to load when the motor is running
at low speed and obtain the optimum U/f
characteristic. The motor size determines the
frequency range within which this parameter
is active.
Motor size
0.25–7.5 kW
U
m
Par.1-60
100%
60%
0%
Changeover
Illustration 3.11 Changeover
1-61 High Speed Load Compensation
Range: Function:
100 % [0 - Enter the % value to compensate voltage in
*
300 %] relation to load when the motor is running
at high speed and obtain the optimum U/f
characteristic. The motor size determines the
frequency range within which this parameter
is active.
of the free-running motor.
m,n
Changeover
<10 Hz
Par.1-61
f
out
47
3 3