Siemens SINAMICS S120 Function Manual page 136

Operating Modes
Vector control
In addition to the equivalent circuit diagram data, motor data identification
(p1910 = 3) can be used to determine the magnetization characteristic of induction
motors. Due to the greater accuracy, the magnetization characteristic should,
whenever possible, be determined during the rotating measurement (with encoder:
p1960 = 1, 3; with encoder:
p1960 = 2, 4). If the drive is operated in the field-weakening range, this character-
istic should be determined during vector control. The magnetization characteristic
can be used to calculate the field-generating current in the field-weakening range
more accurately, thereby increasing torque accuracy.
Note
Speed controller optimization (p1960) allows the rated magnetization current and
saturation characteristic to be determined more accurately for induction motors.
Fig. 3-38
Note
To set the new controller setting permanently, the data must be saved in a
non-volatile memory. Refer to "Parameters".
Carrying out motor identification
S Enter p1910 > 0. Alarm A07991 is displayed.
S Identification starts when the motor is switched on.
S p1910 resets itself to "0" (successful identification) or fault F07990 is output.
3-136
FluxF [%]
p0365
p0364
100 %
p0363
p0362
0
p0366 p0367 100 % p0368
i [A]
i [%]
=
r0331
Magnetization characteristic
p0369 i [%]
i = magnetization
characteristic
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition