Motor Data Identification - Siemens SINAMICS S120 Function Manual

4.13

Motor data identification

Description
The motor data identification (MotID) is used as a tool to determine the motor data, e.g. of
third-party motors and can help to improve the torque accuracy (k
system must have been commissioned for the first time as basis for using motor data
identification. To do this, either the electrical motor data (motor data sheet) or the rating plate
data must be entered and the calculation of the motor/control parameters (p0340) must have
been completed.
Commissioning involves the following steps:
1. Enter the motor data, rating plate data and, if applicable, the encoder data.
2. The converter determines the motor and control data as starting value for the motor data
identification (p0340 = 3, if motor data, p0340 = 1, if rating plate data was entered).
3. Make a stationary measurement (p1910).
4. For synchronous motors:
Perform a commutation angle calibration (p1990) and, if necessary, e.g. because of
overtraveling the zero mark, perform a fine synchronization (see r1992). Absolute
encoders do not have to be finely synchronized.
For fine synchronization, see also Section "Pole position identification (Page 163)" under
"Pole position correction with zero marks".
5. Make a rotating measurement (p1960).
Before starting the rotating measurement, check and, if necessary, optimize the setting of
the speed controller (p1460, p1462 and p1470, p1472).
It is preferable if the rotating motor data identification is carried out with the motor de-
coupled from the mechanical system. This therefore means that only the motor moment
of inertia is determined. The total moment of inertia with mechanical system can be
subsequently identified with p1959 = 4 and p1960 = 1. The stress on the mechanical
system can be reduced by parameterizing the ramp-up time (p1958), using direction
limiting (p1959.14/p1959.15) or using the current and speed limit. The higher the selected
ramp-up time, the less accurate the moment of inertia determined.
6. To store the results of the motor data identification retentively, execute the "Copy RAM to
ROM" command.
Note
Completion of the individual identification runs can be read via parameters r3925 to r3928.
The enable signals OFF1, OFF2, OFF3 and "enable operation" remain effective and can
interrupt the motor data identification routine.
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Servo control
4.13 Motor data identification
estimator). The drive
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