Siemens SINAMICS S120 Function Manual page 181

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 inverted: 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.
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Speed controller Kp_n/Tn_n adaptation
Vector control
4.4 Speed controller adaptation
179