WEG CFW-09 - Page 217

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CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
P411
(1)
0.00 to 99.99
Motor Flux Leakage
[ 0.00 ]
Inductance
0.01 mH
Value estimated by the Self-tuning routine.
P412
0.000 to 9.999
Lr/Rr Constant (Rotor
[ 0.000 ]
Time Constant - Tr)
0.001 s
Range
[Factory Setting]
Parameter
Unit
Description / Notes
This parame-
ter is shown on the
display(s)onlywhen
P202 = 3 or 4
(VectorControl)
This parame-
ter is shown on the
display(s)onlywhen
P202 = 3 or 4
(VectorControl)
P410
0 to 1.25 x P295
Motor Magnetizing
[ 0.0 ]
Current(I
mr
)
0.1 A
When the motor can operate decoupled from the load (P408 = 2) this
value is estimated by the Self-tuning routine (P408 = 1 or 3) otherwise
it is obtained from a pre-stored value array valid for WEG motors.
If a non WEG motor is being used set this parameter to the correct
valuebefore starting Self-tuning.
For P202 = 4 (vector with encoder), the value set at P410 determines
the motor flux. Thus ensure correct setting. If this setting is too low, the
motor will lose flux and torque, if too high, the motor running starts to
oscillate at rated speed or even this speed may not be reached. In this
case, decrement P410 or P178 till speed oscillation stops or the rated
speed is reached.
This parame-
ter is shown on the
display(s)onlywhen
P202 = 3 or 4
(VectorControl)
The setting of P412 determines the gains of the flux regulator (P175
and P176).
The value of P412 is estimated by the self-tuning routine for motors up
to 75 hp/55 kW. For higher ratings, this parameter is set according to
thevalues forthe WEGstandardmotors (table6.63showstypicalvalues
for some motors).
Thevalueofthisparameteraffects thespeedaccuracyfor theSensorless
Vector Mode Control.
Usually, the self-tuning routineis runwhen themotor is cold. Depending
on the motor, the value of P412 may vary more or less according to the
motor temperature. Therefore, when running a hot motor, adjust P412
so that the loaded motor speed (measured at the motor shaft with a
tachometer) is thesame asthat indicatedontheinverter keypad (P001).
This setting shall be performed at the half of the rated speed.
For P202 = 4 (Vector with Encoder Control), if the setting of P412 is
incorrect the motor will lose torque. In this case, set P412 so that the
motor current (P003) reaches the lowest value at the half of the rated
speed and with a steady load.
In the Sensorless Vector Control the value of the parameter P175 will
be limited in the range: 3.0

P175

8.0.