Danfoss VLT AutomationDrive FC 302 Programming Manual page 47

Parameter Descriptions
1-47 Torque Calibration
Use this parameter to optimise the torque estimate in the full
speed range. The estimated torque is based on the shaft power,
P = P - R * I 2 . This means that it is important to have the
shaft m s
correct R value. The R value in this formula is equal to the
s s
power loss in both the motor, the cable and the frequency
converter. Sometimes it is not possible to adjust
parameter 1-30 Stator Resistance (Rs) on each frequency converter
to compensate for the cable length, frequency converter losses
and the temperature deviation on the motor. When enabling this
function, the frequency converter calculates the R
starts, ensuring the optimal torque estimate and thereby optimal
performance.
Option: Function:
temperature since last start-up. The
value is reset after a power cycle.
[3] 1st start with The frequency converter calibrates the
store torque at the first start-up after power-
up. This option is used to update
motor parameters
parameter 1-30 Stator Resistance (Rs),
parameter 1-33 Stator Leakage
Reactance (X1), parameter 1-34 Rotor
Leakage Reactance (X2) and
parameter 1-37 d-axis Inductance (Ld).
[4] Every start The frequency converter calibrates the
with store torque at every start-up, compensating
for a possible change in motor
temperature since last start-up. This
option is used to update motor
parameters parameter 1-30 Stator
Resistance (Rs), parameter 1-33 Stator
Leakage Reactance (X1),
parameter 1-34 Rotor Leakage Reactance
(X2) and parameter 1-37 d-axis
Inductance (Ld).
1-48 Inductance Sat. Point
Range: Function:
35 % [1 - 500 %] Inductance Saturation Point.
*
3.3.6 1-5* Load Indep. Setting
1-50 Motor Magnetisation at Zero Speed
Range: Function:
100 [0 - Use this parameter along with parameter 1-51 Min
% 300 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
magnetising current. If the setting is too low, the
torque on the motor shaft may be reduced.
®
VLT AutomationDrive FC 301/302 Programming Guide
1-50 Motor Magnetisation at Zero Speed
Range:
value when it
s
NOTICE
Parameter 1-50 Motor Magnetisation at Zero Speed has no
effect when 1-10 Motor Construction = [1] PM, non salient
SPM.
1-51 Min Speed Normal Magnetising [RPM]
Range:
Size
related
*
NOTICE
Parameter 1-51 Min Speed Normal Magnetising [RPM] has
no 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
*
MG33MI02 - Rev. 2013-11-20
Function:
Magn. current
100%
Par.1-50
Par.1-51
Par.1-52
Illustration 3.7 Motor Magnetisation
Function:
[10 - Set the required speed for normal
300 magnetising current. If the speed is set
RPM] lower than the motor slip speed,
parameter 1-50 Motor Magnetisation at Zero
Speed and parameter 1-51 Min Speed
Normal Magnetising [RPM] are of no signif-
icance.
Use this parameter along with
parameter 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,
parameter 1-50 Motor Magnetisation at
Zero Speed is inactive.
Use this parameter along with
parameter 1-50 Motor Magnetisation at
Zero Speed. See Illustration 3.7.
Function:
NOTICE
[ 4 -
18.0
This parameter cannot be adjusted
Hz]
while the motor is running.
Flux Model shift
3 3
Hz
RPM
45