Rotating Measurement - Siemens SINAMICS S120 Function Manual

5.14.3

Rotating measurement

Rotating measurement (p1900, p1960)
"Rotating measurement" can be activated via p1960 or p1900 = 3. It should be performed
only after the motor data identification (p1910).
The rotating measurement contains a speed control tuning with which the drive's moment of
inertia is ascertained and the speed controller is set. In addition, the saturation characteristic
and rated magnetizing current of induction motors are measured and so make a significant
contribution to improving the torque accuracy.
If the rotating measurement is not to be carried out using the speed set in p1965, this
parameter can be changed before the measurement is started. Higher speeds are
recommended.
The same applies to the speed in p1961 for which the saturation characteristic is determined
and the encoder test is carried out.
The speed controller is set to the symmetrical optimum in accordance with dynamic factor
p1967. p1967 must be set before the tuning 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 then be
checked to ensure that it is stable across the entire control range. The dynamic response
might need to be reduced or the Kp_n/Tn_n adaptation for the speed controller
parameterized accordingly.
Note
If the dynamic response of the speed controller is reduced excessively because of load
oscillations, the oscillation test can also be deactivated (p1959.4 = 0).
When commissioning induction machines, you are advised to proceed as follows:
● Before connecting the load, a complete "rotating measurement" (p1900 = 3 or without
● When the load is connected, speed controller tuning should be repeated because the
When permanent-magnet synchronous motors are commissioned, the speed controller
should be tuned (p1900 = 3 or p1960 > 0) when the load is connected.
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
encoder: p1960 = 1; with encoder: p1960 = 2) should be carried out. Since the induction
machine is idling, you can expect highly accurate results for the saturation characteristic
and the rated magnetizing current.
total moment of inertia has changed. This is realized by selecting parameter p1960
(without encoder: p1960 = 3; with encoder: p1960 = 4).
The saturation characteristic recording is automatically deactivated in parameter p1959
during the speed tuning run.
5.14 Motor data identification and rotating measurement
Vector control
229