Danfoss VLT AutomationDrive FC 300 Programming Manual page 44

Parameter Descriptions
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
3 3
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]
1-48 Inductance Sat. Point
Range:
35 % [1 - 500 %]
*
3.3.6 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.
42
VLT
= P - R * I
shaft m s
. The R
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.
Function:
Inductance Saturation Point.
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 Motor Magnetisation
MG33MG02 - VLT
®
AutomationDrive Programming Guide
1-51 Min Speed Normal Magnetising [RPM]
Range:
Size
2 . This means
related
*
in this formula
s
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
*
1-53 Model Shift Frequency
Range:
Size
related
*
Hz
RPM
®
is a registered Danfoss trademark
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 3.6.
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.
Function:
NOTE
[ 4 -
18.0
This parameter cannot be adjusted while
Hz]
the motor is running.
Flux Model shift
Enter the frequency value for shift between
two models for determining motor speed.
Choose the value based on settings in
1-00 Configuration Mode and 1-01 Motor
Control Principle. There are two options: shift
between Flux model 1 and Flux model 2; or
shift between Variable Current mode and Flux
model 2. FC 302 only.
Flux Model 1 – Flux model 2
This model is used when 1-00 Configuration
Mode is set to Speed closed loop [1] or Torque
[2] and 1-01 Motor Control Principle is set to
Flux w/motor feedback [3]. With this parameter
it is possible to make an adjustment of the
shifting point where FC 302 changes between
Flux model 1 and Flux model 2, which is
useful in some sensitive speed and torque
control applications.