Siemens SINAMICS S120 Function Manual page 135

Standstill measurement (p1910)
Motor identification with p1910 is used for determining the motor parameters at
standstill (see also p1960: speed controller optimization):
S Equivalent circuit diagram data p1910 = 1
S Magnetization characteristic p1910 = 3 (not recommended with
permanent-magnet synchronous motors)
For control engineering reasons, you are strongly advised to carry out motor identi-
fication because the equivalent circuit diagram data, motor cable resistance, IGBT
on-state voltage, and compensation for the IGBT lockout time can only be esti-
mated if the data on the type plate is used. For this reason, the stator resistance
for the stability of sensorless vector control or for the voltage boost in the V/f curve
is very important. Motor identification is essential if long supply cables or third-party
motors are used. When motor data identification is started for the first time, the
following data is determined with p1910 on the basis of the data on the type plate
(rated data):
Table 3-11 Determining data via p1910
p1910 = 1 S Stator resistance (p0350)
Rotor resistance (p0354)
S
S Stator leakage inductance (p0356)
S Rotor leakage inductance (p0358)
Magnetizing inductance (p0360)
S
S Converter valve threshold voltage
(p1825)
Compensation valve interlocking time
S
phase (p1828 ... p1830)
p1910 = 3 Saturation characteristic (p0362 ...
S
p0366)
Since the type plate data contains the initialization values for identification, you
must ensure that it is entered correctly and consistently to enable the above data
to be determined.
Motor Module
p p
1825 1828
Fig. 3-37 Equivalent circuit diagram for induction motor and cable
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition
Induction motor
Cable
p
p [M]
0350
0352
R
000 00
C
000 00
Permanent- -magnet synchronous motor
S Stator resistance (p0350)
Stator leakage inductance q-axis
S
(p0356)
S Stator leakage inductance d-axis
(p0357)
Converter valve threshold voltage
S
(p1825)
S Compensation valve interlocking time
phase (p1828 ... p1830)
Not recommended
Motor
[M]
p [M] p [M]
0356 0358
R LsR
LsS
S
L
p [M]
0360
M
Operating Modes
Vector control
p [M]
0354
R
R
3-135