Siemens SINAMICS S120 Function Manual page 137

Rotating measurement (p1960)
Different data is identified during the rotating measurement. Speed controller opti-
mization determines the data required (e.g. moment of inertia) for setting the
speed controller. It also measures the saturation characteristic and rated magne-
tization current of induction motors.
Speed control can be activated via p1960 or p1900 = 1.
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.
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 dy-
namic 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 the the drive cannot operate in a
stable manner with the specified dynamic factor, 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 parameter-
ized accordingly.
When commissioning induction machines, you are advised to proceed as follows:
S Before the load is connected, 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.
S When the load is connected, speed controller optimization should be repeated
because the total inertia load has changed. This is carried out by selecting
parameter p1960 (without encoder: p1960 = 3; with encoder: p1960 = 4).
When permanent-magnet synchronous motors are commissioned, speed controller
optimization (p1960 = 2/4) should be carried out when the load is connected.
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition
Operating Modes
Vector control
3-137