Danfoss VLT AutomationDrive FC 300 Series Programming Manual page 41

Parameter Descriptions
1-40 Back EMF at 1000 RPM
Range:
3 3
1-41 Motor Angle Offset
Range:
0 [-32768 -
*
32767 ]
1-46 Position Detection Gain
Range:
100 % [20 - 200 %] Adjusts the amplitude of the test pulse
*
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
that it is important to have the correct R
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
The parameter is only active when running PM motor in Flux
Open Loop.
Option:
[0]
[1]
[2]
40
VLT
Function:
NOTE
When using PM motors, it is
recommended to use brake
resistors.
Function:
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).
Function:
during position detection at start. Adjust
this parameter to improve the position
measurement.
= P - R * I
shaft m s
. The R
s s
when starting.
s
Function:
Off
1st start after pwr- Calibrates at the first start-
up up after power up and
keeps this value until reset
by a power cycle.
Every start Calibrates at every start-up,
compensating for a possible
change in motor
temperature since last start-
up.
MG33ME02 - VLT
®
AutomationDrive Programmming Guide
3.3.5 1-5* Load Indep. Setting
1-50 Motor Magnetisation at Zero Speed
Range:
100 [0 -
% 300
*
%]
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:
Size
related
*
2 . This means
in this formula
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:
Size
related
*
®
is a registered Danfoss trademark
Function:
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
100%
Par.1-50
Par.1-51
Par.1-52
Illustration 3.7
Function:
[10 - 300 Set the required speed for normal
RPM] 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.
Function:
[ 0 - Set the required frequency for normal
250.0 Hz] 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.
Hz
RPM