Siemens SINAMICS S120 Function Manual page 251

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The speed controller is set to the symmetrical optimum in accordance with dynamic factor

p1967. Parameter 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.

In this case, a check must be performed to see whether the drive is running stable across the

entire setting range. The dynamic response might need to be reduced or the Kp_n/Tn_n

adaptation for the speed controller parameterized accordingly.

Dynamic response reduced too much

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).

Recommendations

● Induction motors

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

● Permanent-magnet synchronous motors

When permanent-magnet synchronous motors are commissioned, the speed controller

should be tuned (p1900 = 3 or p1960 > 0) when the load is connected.

Unexpected motor motion during motor data identification

Motor movement caused when optimizing the speed controller can result in death, severe

injury or material damage.

● Ensure that nobody is in the danger zone and that the mechanical parts can move freely.

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

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). During the speed optimization,

the saturation characteristic recording is automatically deactivated in parameter p1959.

6.13 Motor data identification and rotating measurement

Vector control