1-55 U/f Characteristic - U
Array [6]
Range:
Function:
Size
related
*
[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
.
1-56 U/f Characteristic - F
Array [6]
Range:
Function:
Size
related
*
[ 0 -
1000.0 Hz]
Enter the frequency points to form 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
.
Motor Voltage
Par 1-55 [x]
Output Frequency
Par 1-56 [x]
1-55[5]
1-55[4]
1-55[3]
1-55[2]
1-55[1]
1-55[0]
1-56
[0]
1-56
[1]
1-56
[2]
1-56
[3]
1-56
[4]
1-56
[5]
130BA166.10
Illustration 3.10 U/f Characteristic
1-57 Torque Estimation Time Constant
Range:
Function:
150 ms
*
[50 - 1000
ms]
NOTICE
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:
Size
related
*
[ 0 -
200 %]
NOTICE
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
m,n
. Adjust the value
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
related
*
[ 0 -
500 %]
Asynchronous motor: Set the frequency of
the flying start test pulses that are used to
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
m,n
of the free-running motor.
Above this value, flying start is always
performed. Below this value, the start mode
is selected in
3.2.10 1-6* Load Depend. Setting
1-60 Low Speed Load Compensation
Range:
Function:
100 %
*
[0 -
300 %]
Enter the % value to compensate voltage in
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
Changeover
0.25–7.5 kW
<10 Hz
Parameter Descriptions
VLT
®
AutomationDrive FC 301/302
56
Danfoss A/S © 10/2018 All rights reserved.
MG33MP02
3
3
Summary of Contents for VLT AutomationDrive FC 302
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