Rotating Measurement And Speed Controller Optimization - Siemens SINAMICS S150 NEMA Operating Instructions Manual

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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

Rotating measurement and speed controller optimization

"Rotating measurement" can be activated using p1960 or using 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. 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 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 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.

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).

Enclosed Drives

Operating Instructions, 12/2018, A5E36652151A

Functions, monitoring and protective functions

9.3 Drive functions