Efficient Networks Siemens Sinamics S120 - Manual (Page 143)

Vector control
4.12 Motor data identification and rotating measurement
Drive Functions
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
143
The speed controller is set to the symmetrical optimum in accordance with dynamic factor
p1967. p1967 must be set before the optimization run and only affects the calculation of the
controller parameters.
If, during the measurement, it becomes clear that, with the specified dynamic factor, the
drive cannot operate in a stable manner or the torque ripples are too large, the dynamic
response is reduced automatically and the result displayed in r1968. The drive must also be
checked to ensure that it is stable across the entire range. If necessary, the dynamic
response may have to be reduced or Kp/Tn adaptation for the speed controller
parameterized accordingly.
When commissioning induction machines, you are advised to proceed as follows:
● Before connecting the load, a complete "rotating measurement" (without encoder: p1960
= 1; with encoder: p1960 = 2) should be carried-out. Since the induction machine is idling,
you can expect highly accurate results regarding the saturation characteristic and the
rated magnetization current.
● When the load is connected, speed controller optimization should be repeated because
the total inertia load has changed. This is realized by selecting parameter p1960 (without
encoder: p1960 = 3; with encoder: p1960 = 4).
When permanent-magnet synchronous motors are commissioned, with the load connected,
the speed controller should be optimized (p1960 = 2/4).
Carrying out the rotating measurement (p1960 > 0)
The following measurements are carried out when the enable signals are set and a switch-
on command is issued in accordance with the settings in p1959 and p1960.
● Encoder test
If a speed encoder is used, the direction of rotation and the pulse number are checked.
● Only for induction motors:
– Measurement of the saturation characteristic (p0362 to p0369)
– Measurement of the magnetization current (p0320) and determination of the offset
voltage of the converter for offset compensation
– Measurement of the saturation of the leakage inductance, for induction motors, and
setting of the current controller adaptation (p0391…p0393)
This is automatically activated with 1LA1 and 1LA8 motors (p0300 = 11, 18) (see
p1959.5).
● Speed controller optimization
– p1470 and p1472, when p1960 = 1 (operation without encoder)
– p1460 and p1462, when p1960 = 2 (operation with encoder)
– Kp adaptation switch-off
● Acceleration pre-control setting (p1496)
● Setting for ratio between the total moment of inertia and that of the motor (p0342)
Note
To set the new controller setting permanently, the data must be saved in a non-volatile
memory. Refer to Chapter "Parameters"