WEG CFW-09 User Manual page 217

CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
[Factory Setting]
Parameter
P410 0 to 1.25 x P295
Motor Magnetizing
Current (I )
mr
This parame-
ter is shown on the
display(s) only when
P202 = 3 or 4
(Vector Control)
(1)
P411
Motor Flux Leakage
Inductance
This parame-
ter is shown on the
display(s) only when
P202 = 3 or 4
(Vector Control)
P412
Lr/Rr Constant (Rotor
Time Constant - Tr)
This parame-
ter is shown on the
display(s) only when
P202 = 3 or 4
(Vector Control)
218
Range
Unit Description / Notes
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
[ 0.0 ]
it is obtained from a pre-stored value array valid for WEG motors.
0.1 A
If a non WEG motor is being used set this parameter to the correct
value before 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.
0.00 to 99.99 Value estimated by the Self-tuning routine.
[ 0.00 ]
0.01 mH
0.000 to 9.999
The setting of P412 determines the gains of the flux regulator (P175
[ 0.000 ]
and P176).
0.001 s
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
the values for the WEG standard motors (table 6.63 shows typical values
for some motors).
The value of this parameter affects the speed accuracy for the Sensorless
Vector Mode Control.
Usually, the self-tuning routine is run when the motor 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 the same as that indicated on the inverter 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.