Siemens SINAMICS S120 Function Manual page 149

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 Magnetizing characteristic p1910 = 3 (functionality is being prepared for
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 estima-
ted 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 3-18 Data determined using p1910
S
p1910 = 1 Stator resistance (p0350)
S
Rotor resistance (p0354)
S
Stator leakage inductance (p0356)
S
Rotor leakage inductance (p0358)
S
Magnetizing inductance (p0360)
S
Drive converter valve threshold voltage
(p1825)
S
Drive converter valve interlocking times
(p1828 ... p1830)
S
p1910 = 3 Saturation characteristics (p0362 ...
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
p1825 p1828
Fig. 3-40 Equivalent circuit diagram for induction motor and cable
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
Induction motor
Cable and series
inductance
p0352 [M] p0353 [M]
L
R
series
cable
C
cable
Permanent-magnet synchronous motor
S
Stator resistance (p0350)
S
Stator resistance q axis (p0356)
S
Stator inductance d axis (p0357)
S
Drive converter valve threshold voltage
(p1825)
S
Drive converter valve interlocking times
(p1828 ... p1830)
Not recommended
Motor
p0350[M] p0356 [M] p0358 [M] p0354 [M]
R Lσ S
S
L
p0360 [M]
M
Operating Modes
Vector control
Lσ R
R
R
3-149