Danfoss VLT AutomationDrive FC 300 Series, Programming Manual, Page: 41 / 211

1-40 Back EMF at 1000 RPM
Range: Function:
NOTE
When using PM motors, it is
recommended to use brake
resistors.
1-41 Motor Angle Offset
Range: Function:
0
*
[-32768 -
32767 ] Enter the correct offset angle between the PM
motor and the index position (single-turn) of the
attached encoder or resolver. The value range of
0 - 32768 corresponds to 0 - 2 * pi (radians). To
obtain the offset angle value: After frequency
converter start-up apply DC-hold and enter the
value of
16-20 Motor Angle into this parameter.
This parameter is only active when 1-10 Motor
Construction is set to [1] PM, non-salient SPM
(Permanent Magnet Motor).
1-46 Position Detection Gain
Range: Function:
100 %
*
[20 - 200 %] Adjusts the amplitude of the test pulse
during position detection at start. Adjust
this parameter to improve the position
measurement.
1-47 Low Speed Torque Calibration
This parameter is used to optimize the torque estimate at low
speed. When running open loop flux at low speed the estimated
torque is based on shaft power, P
shaft
= P
m
- R
s
* I 2 . This means
that it is important to have the correct R
s
. The R
s
in this formula
must be equal to the loss in both motor, cable and frequency
converter. Sometimes it is not possible to adjust
1-30 Stator
Resistance (Rs) on each frequency converter to compensate for
cable length, frequency converter losses and temperature
deviation on motor. Therefore the frequency converter must be
able to calculate R
s
when starting.
The parameter is only active when running PM motor in Flux
Open Loop.
Option: Function:
[0] Off
[1] 1st start after pwr-
up Calibrates at the first start-
up after power up and
keeps this value until reset
by a power cycle.
[2] Every start Calibrates at every start-up,
compensating for a possible
change in motor
temperature since last start-
up.
3.3.5 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
Illustration 3.7
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 3.4 .
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 -
250.0 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 is inactive.
Use this parameter along with
1-50 Motor Magnetisation at Zero Speed .
See drawing for 1-50 Motor Magneti-
sation at Zero Speed .
Parameter Descriptions
VLT
®
AutomationDrive Programmming Guide
40 MG33ME02 - VLT
®
is a registered Danfoss trademark
3 3