Efficient Networks Siemens Sinamics S120 - Manual (Page 92)

Servo control
3.12 Motor data identification
Drive Functions
92
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
3.12 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
T
estimator). 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 parameters (p0340) must have been completed.
Commissioning involves the following steps:
● Enter the motor data or the rating plate data and the encoder data
● 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)
● Carry-out a static measurement (p1910)
● For synchronous motors: Carry-out an angular commutation calibration (p1990) and if
required, fine synchronization (refer to r1992)
● 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.
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 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.
Note
If a ramp-up/ramp-down time or one direction of rotation limit is activated, parts of the motor
data identification routine cannot be carried-out. For other parts of the motor data
identification routine, the accuracy of the results is diminished because a ramp-up/ramp-
down time is selected. If possible, p1958 should be 0 and no direction of rotation limit
selected (p1959.14 = 1 and p1959.15 = 1).