Siemens SINAMICS S120 Function Manual page 150

Operating Modes
Vector control
In addition to the equivalent circuit diagram data, motor data identification (p1910
= 3) can be used for induction motors to determine the magnetization characteristic
of the motor. Due to the higher accuracy, the magnetization characteristic should, if
possible, be determined during the rotating measurement (without encoder: p1960
= 1, 3; with encoder: p1960 = 2, 4) If the drive is operated in the field-weakening
range, this characteristic should be determined for vector control in particular. The
magnetization characteristic can be used to calculate the field-generating current in
the field-weakening range more accurately, thereby increasing torque accuracy.
Note
In comparison with the standstill measurement (p1910), for induction motors, the
speed controller optimization (p1960) allows the rated magnetization current and
saturation characteristic to be determined more accurately.
Fig. 3-41
Note
To set the new controller setting permanently, the data must be saved in a
non-volatile memory. Refer to Chapter "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.
3-150
FluxΦ [%]
p
0365
p
0364
100%
p
0363
p
0362
0
p
0366
i [A]
m
=
i
m [%]
r0331
Magnetization characteristic
p 100% p p
0367 0368 0369
i = m
magnetization characteristic
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
i [%]
m