Rotating Measurement And Speed Controller Optimization - Siemens SINAMICS G150 Operating Instructions Manual

Functions, monitoring, and protective functions
9.2 Drive functions
Danger to life as a result of unexpected motor movement when identifying the motor
When the motor identification is selected, after commissioning the drive may cause the
motor to move.
• Observe the general safety instructions.
• Ensure that the EMERGENCY STOP functions are fully functional when commissioning
9.2.1.2

Rotating measurement and speed controller optimization

Description
"Rotating measurement" can be activated via p1960 or p1900 = 1.
The main difference between rotating measurement and standstill measurement is speed
control optimization, with which the drive's moment of inertia is ascertained and speed
controller is set. On induction motors, the saturation characteristic and rated magnetization
current are also measured.
If rotating measurement is not to be carried out at 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, at 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 optimization run and only affects the calculation of the
controller parameters.
If, during the measurement, it becomes clear that the drive cannot operate in a stable
manner with the specified dynamic factor or that the torque ripples are too great, 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. The dynamic response
might need 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 for the saturation characteristic and the rated
magnetization current.
● When the load is connected, speed controller optimization should be repeated because
the 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.
When permanent-magnet synchronous motors are commissioned, the speed controller
should be tuned (p1900 = 3 or p1960 > 0) when the load is connected.
480
WARNING
the drive.
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A