Danfoss VLT AutomationDrive FC 300 Series, Programming Manual, Page: 42 / 211

1-53 Model Shift Frequency
Range: Function:
Size related
*
[ 4.0 - 18.0 Hz]
1-54 Voltage reduction in fieldweakening
Range: Function:
0 V
*
[0 - 100
V] The value of this parameter will reduce the
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
*
[0.0 -
1000.0 V] Enter the voltage at each frequency
point to manually form a U/f charac-
teristic 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 -
1000.0 Hz] Enter the frequency points to
manually form a U/f-characteristic
matching the 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 .
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
1-58 Flystart Test Pulses Current
Range: Function:
Size
related
*
[ 0 -
0 %] Sets the current level for the flystart test
pulses that are used to detect the motor
direction. 100% means I
m,n
. Adjust the value to
be big 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
plus .
1-59 Flystart Test Pulses Frequency
Range: Function:
Size
related
*
[ 0 -
0 %] Sets the frequency of the flystart test pulses
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
plus
.
3.3.6 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 Change over
0.25 kW - 7.5 kW < 10 Hz
Table 3.5
Parameter Descriptions
VLT
®
AutomationDrive Programmming Guide
MG33ME02 - VLT
®
is a registered Danfoss trademark 41
3 3