Motor Data Identification - Siemens SINAMICS S120 Function Manual

5.13.2

Motor data identification

Motor data identification (p1900, p1910)
The motor data identification can be activated via p1900 = 2 or p1910 = 1. It is used to
determine the motor parameters (equivalent circuit diagram) at standstill.
For control engineering reasons, you are strongly advised to carry out motor data
identification because the equivalent circuit diagram data and motor cable resistance can
only be estimated if the data on the type plate is used. For this reason, the stator resistance
is a very important for the stability of sensorless vector control or for the voltage boost in the
V/f curve. Motor data identification is essential if long supply cables or third-party motors are
used. When motor data identification is started, the following data is determined with p1910
on the basis of the data on the rating plate:
Table 5- 2
Determined data for p1910 = 1
Rated magnetization current (p0320)
Stator resistance (p0350)
Rotor resistance (p0354)
Stator leakage inductance (p0356)
Stator inductance d axis (p0357)
Rotor leakage inductance (p0358)
Magnetizing inductance (p0360)
Drive converter valve threshold voltage
(p1825)
Converter valve interlocking times
(p1828 ... p1830)
Since the rating plate data contains the initialization values for identification, you must
ensure that it is entered correctly and consistently (taking into account the connection type
(star/delta)) so that the above data can be determined.
It is advisable to enter the motor supply cable resistance (p0352) before the standstill
measurement (p1910) is performed, so that it can be subtracted from the total measured
resistance when the stator resistance is calculated (p0350).
Entering the cable resistance improves the accuracy of thermal resistance adaptation,
particularly when long supply cables are used. This governs behavior at low speeds,
particularly during encoderless vector control.
For p1909.20 = 1 (and p0352 = 0), the supply cable resistance is set from the difference of
the measured value and the default value of the automatic parameterization or the value of
the data set for list motors. The supply cable resistance then normally no needs to be
entered.
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Determined data
5.13 Motor data identification and rotating measurement
Induction motor
synchronous
x
x
x
x
-
x
x
x
x
Vector control
Permanent Synchronous
magnet reluctance motor
motor
-
x
-
x
x
-
-
x
x
-
x
-
-
-
-
-
x
x
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