Motor Data Identification - Siemens SINAMICS S120 Function Manual

Operating Modes
Servo control
3.1.11

Motor data identification

Description
The motor data identification (MotID) is used as tool to determine the motor data,
e.g. of third-party motors and can help to improve the torque accuracy (k
tor). The drive system must have been commissioned for the first time as basis for
using MotID. 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 parame-
ters (p0340) must have been completed.
Commissioning involves the following steps:
S Enter the motor data or the rating plate data and the encoder data
S Complete calculation of the motor and control data as starting value for the
MotID (p0340 = 3, if motor data, p0340 = 1, if rating plate data were entered)
S Carry-out a static measurement (p1910)
S For synchronous motors: Carry-out an angular commutation calibration (p1990)
and if required, fine synchronization (refer to r1992)
S Carry-out a rotating measurement (p1960)
Before starting the rotating measurement, the speed controller setting should
be checked and optimized (p1460, p1462 and p1470, p1472).
It is preferable if the rotating MotID 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) and/or using a speed limit (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.
The enable signals OFF1, OFF2, OFF3 and "enable operation" remain effective
and can be interrupt the motor identification routine.
If there is an extended setpoint channel (r0108.08 = 1), parameters p1959.14 = 0
and p1959.15 = 0 and a direction of rotation limit (p1110 or p1111) is active there,
then this is observed at the instant of the start via p1960. For p1958 = –1, the
ramp-up and ramp-down time of the setpoint channel (p1120 and p1121) are also
used for the MotID.
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© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
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