Danfoss VLT AutomationDrive FC 301 Programming Manual page 45

Parameter Descriptions
1-53 Model Shift Frequency
Range: Function:
f
N,M
Variable
current
model
Illustration 3.9 1-00 Configuration Mode =
[0] Speed open loop, 1-01 Motor Control
Principle = [2] Flux sensorless
1-54 Voltage reduction in fieldweakening
Range: Function:
0 V [0 - The value of this parameter will reduce the
*
100 V] maximal voltage available for the flux of the
motor in fieldweakning, giving more voltage
available for torque. Be aware that too high value
may give stall problems at high speed.
1-55 U/f Characteristic - U
Range: Function:
Size related [0 - Enter the voltage at each frequency point
*
1000 V] to manually form a U/f characteristic
matching the motor.
The frequency points are defined in
1-56 U/f Characteristic - F.
This parameter is an array parameter [0-5]
and is only accessible when 1-01 Motor
Control Principle is set to [0] U/f.
1-56 U/f Characteristic - F
Range: Function:
Size related [ 0 - Enter the frequency points to manually
*
1000.0 form a U/f-characteristic matching the
Hz] motor.
The voltage at each point is defined in
1-55 U/f Characteristic - U.
This parameter is an array parameter
[0-5] and is only accessible when
1-01 Motor Control Principle is set to [0]
U/f.
®
VLT AutomationDrive FC 301/302 Programming Guide
f
x 0.1 x 0.125
N,M
Flux model 2
f
P 1-53
out
MG33MH02 - Rev. 2013-09-30
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
1-58 Flystart Test Pulses Current
Range: Function:
Size [ 0 Sets the current level for the flystart test pulses
related - 0 that are used to detect the motor direction.
*
%] 100% means I
enough to avoid noise influence but low
enough to avoid affecting the accuracy (current
must be able to drop to zero 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 PM motors
adjusting the value will tune for back EMF and
d-axis inductance of the motor.
This parameter is only available in VVC
1-59 Flystart Test Pulses Frequency
Range: Function:
Size [ 0 Sets the frequency of the flystart test pulses
related - 0 that are used to detect the motor direction.
*
%] 100% means means 2 x fslip. Increase this
value to reduce the generated torque. For PM
motors this value is the percentage nm,n of
the free running PM motor. Above this value
flystart is always performed. Below this value,
the start mode is selected in 1-70 PM Start
Mode
This parameter is only available in VVC
3.3.7 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 charac-
teristic. The motor size determines the
1-56
1-56 1-56
[5]
[3] [4]
Output Frequency
Par 1-56 [x]
. Adjust the value to be big
m,n
plus
.
plus
.
43
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