Siemens SINAMICS S150 NEMA, Operating Instructions Manual

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Setpoint channel and closed-loop control
7.4 Vector speed/torque control with/without an encoder
Enclosed Drives
476
Operating Instructions, 12/2018, A5E36652151A
Example of speed-dependent adaptation
Figure 7-18 Example of speed-dependent adaptation
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.
Function diagram
FP 6050 Speed controller adaptation (Kp_n/Tn_n adaptation)
Parameters
• p1400.5 Speed control configuration: Kp/Tn adaptation active
• p1400.6 Speed control configuration: Free Tn adaptation active
• p1470
Speed controller encoderless operation P gain
• p1472
Speed controller encoderless operation integral time