Technical information

3.3.6 1-5* Load Indep. Setting
1-50 Motor Magnetisation at Zero Speed
Range: Function:
100
%*
[0 -
300
%]
Use this parameter along with 1-51 Min Speed
Normal Magnetising [RPM] to obtain a different
thermal load on the motor when running at low
speed.
Enter a value which is a percentage of the rated
magnetizing current. If the setting is too low, the
torque on the motor shaft may be reduced.
Magn. current
130BA045.11
Hz
Par.1-50
Par.1-51
100%
Par.1-52 RPM
NOTE
1-50 Motor Magnetisation at Zero Speed will not have effect
when 1-10 Motor Construction = [1] PM, non salient SPM.
1-51 Min Speed Normal Magnetising [RPM]
Range: Function:
Size
related*
[10 - 300
RPM]
Set the required speed for normal
magnetising current. If the speed is set
lower than the motor slip speed,
1-50 Motor Magnetisation at Zero Speed
and 1-51 Min Speed Normal Magnetising
[RPM] are of no significance.
Use this parameter along with
1-50 Motor Magnetisation at Zero Speed.
See Table 3.3.
NOTE
1-51 Min Speed Normal Magnetising [RPM] will not have
effect when 1-10 Motor Construction = [1] PM, non salient
SPM.
1-52 Min Speed Normal Magnetising [Hz]
Range: Function:
Size
related*
[ 0.3 -
10.0 Hz]
Set the required frequency for normal
magnetising current. If the frequency is
set lower than the motor slip frequency,
1-50 Motor Magnetisation at Zero Speed
and 1-51 Min Speed Normal Magnetising
[RPM] are inactive.
Use this parameter along with
1-50 Motor Magnetisation at Zero Speed.
See Table 3.3.
NOTE
1-52 Min Speed Normal Magnetising [Hz] will not have effect
when 1-10 Motor Construction = [1] PM, non salient SPM.
1-58 Flystart Test Pulses Current
Range: Function:
Size
related*
[ 0 -
0. %]
Set the magnitude of the magnetizing current
for the pulses used to detect the motor
direction. The value range and function
depends on parameter 1-10 Motor Construction:
[0] Asynchron: [0-200%]
Reducing this value will reduce the generated
torque. 100% means full nominal motor
current. In this case the default value is 30%.
[1] PM non salient: [0-40%]
A general setting of 20% is recommended on
PM motors. Higher values can give increased
performance. However, on motors with back
EMF higher than 300VLL (rms) at nominal
speed and high winding inductance (more
than 10mH) a lower value is recommended to
avoid wrong speed estimation. The parameter
is active when 1-73 Flying Start is enabled.
NOTE
See description of 1-70 PM Start Mode for an overview of
the relation between the PM Flying Start parameters.
1-59 Flystart Test Pulses Frequency
Range: Function:
Size
related*
[ 0 -
0. %]
The parameter is active when 1-73 Flying Start
is enabled. The value range and function
depends on parameter 1-10 Motor Construction:
[0] Asynchron: [0-500%]
Control the percentage of the frequency for
the pulses used to detect the motor direction.
Increasing this value will reduce the generated
torque. In this mode 100% means 2 times the
slip frequency.
[1] PM non salient: [0-10%]
This parameter defines the motor speed (in %
of nominal motor speed) below which the
Parking function (see 2-06 Parking Current and
2-07 Parking Time will become active. This
parameter is only active when 1-70 PM Start
Mode is set to [1] Parking and only after
starting the motor.
NOTE
Do NOT set this parameter too high in high inertia
applications.
Parameter Description
VLT
®
HVAC Drive Programming Guide
42 MG11CD02 - VLT
®
is a registered Danfoss trademark
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