Danfoss VLT AutomationDrive FC 301 Programming Manual page 55

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
Enter the time constant for the torque estimation below model
change point in flux sensorless control principle.
Range:
150 ms [50 - 1000 ms]
*
1-58 Flying Start Test Pulses Current
Range: Function:
Size [ 0 - Sets the current level for the fly start test
related 200 %] pulses that are used to detect the motor
*
direction. 100% means I
value to be big 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
*
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 nm,n of the free-running motor.
Above this value, flying start is always
performed. Below this value, the start mode
is selected in parameter 1-70 PM Start Mode
MG33ML02
Programming Guide
1-56
1-56 1-56
[5]
[3] [4]
Output Frequency
Par 1-56 [x]
Function:
. Adjust the
m,n
Danfoss A/S © 02/2016 All rights reserved.
3.3.9 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.
Motor size
0.25 - 7.5 kW
Table 3.7 Changeover Frequency
1-62 Slip Compensation
Range: Function:
Size [-500 Enter the % value for slip compensation, to
related - compensate for tolerances in the value of
*
500 %] n . Slip compensation is calculated automat-
M,N
ically, that is on the basis of the nominal
motor speed n
This function is not active when
parameter 1-00 Configuration Mode is set to
[1] Speed closed loop or [2] Torque torque
Changeover
<10 Hz
Par.1-61
f
out
Changeover
>10 Hz
.
M,N
53
3 3