Danfoss VLT AutomationDrive FC 301 Programming Manual page 67

Parameter Descriptions
1-57 Torque Estimation Time Constant
Range: Function:
change point in flux sensorless
control principle.
1-58 Flying Start Test Pulses Current
Range: Function:
NOTICE
Size [ 0 - 200 %]
related
*
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
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 - 500 %] Asynchronous motor: Set the
related 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
running motor. Above this value,
flying start is always performed.
Below this value, the start mode is
selected in parameter 1-70 Start
Mode
M0013101
Programming Guide
+ .
. Adjust the value to be
m,n
of the free-
m,n
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3.2.9 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 charac-
teristic. 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 - 300 %] Enter the % value to compensate
*
voltage in relation to load when the
motor is running at high speed and
obtain the optimum U/f charac-
teristic. 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 compen-
related 500 %] sation to compensate for tolerances
*
in the value of n
sation is calculated automatically,
that is on the basis of the nominal
motor speed n
Changeover
<10 Hz
Par.1-61
f
out
Changeover
>10 Hz
. Slip compen-
M,N
.
M,N
65
3 3