Siemens Sinamics S120 Function Manual page 156

Vector control
4.4 Speed controller adaptation
Example of speed-dependent adaptation
Figure 4-8
For operation without encoder, a higher value is in p1464 than in p1465. As a consequence,
the behavior is inversed: Kp increases with increasing speed and Tn decreases.
Special case, encoderless operation in the field-weakening range
In encoderless operation, dynamic reduction for the field-weakening range can be activated
with p1400.0 = 1.
Kp/Tn ∼ flux setpoint
Kp/Tn decreases proportionally with the flux setpoint (minimum: Factor 0.25).
This dynamic reduction is activated to reduce the controller dynamic response in the field
weakening range. Up to the field-weakening range, the higher controller dynamic of the
speed controller is kept.
Function diagrams (see SINAMICS S120/S150 List Manual)
● 6050 Vector control - Kp_n/Tn_n adaptation
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● p1400.0 Speed control configuration: Automatic Kp/Tn adaptation active
● p1400.5 speed control configuration: Kp/Tn adaptation active
● p1400.6 Closed-loop speed control configuration: Free Tn adaptation active
154
Speed controller Kp_n/Tn_n adaptation
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions