Droop Function - Siemens SINAMICS S150 NEMA Operating Instructions Manual

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Free Kp_n adaptation

Speed-dependent Kp_n/Tn_n adaptation (VC only)

Dynamic response reduction field weakening (encoderless VC only)

Droop Function

Droop (enabled via p1492) ensures that the speed setpoint is reduced proportionally as the

load torque increases.

The droop function has a torque limiting effect on a drive that is coupled to a different speed

(e.g. guide roller on a material web). In connection with the torque setpoint of a leading

speed-controlled drive, a very effective load distribution can also be implemented. With the

appropriate setting (in contrast to torque control or load distribution with overcontrol and

limitation), this load distribution can even handle a smooth mechanical coupling or if slip

should occur.

This method is only suitable to a limited extent for drives that are accelerated and braked

with significant changes in speed.

The droop feedback is used, for example, in applications in which two or more motors are

operated with a common shaft and fulfill the above requirements. It limits the torque

differences that can occur as a result of the coupling by appropriately modifying the speeds

of the individual motors. The load on the drive is reduced when the torque is excessively

Enclosed Drives

Operating Instructions, 12/2018, A5E36652151A

Speed controller P gain adaptation signal

Speed controller P gain adaptation lower starting point

Speed controller P gain adaptation upper starting point

Adaptation factor lower

Adaptation factor upper

CI: Speed controller P gain scaling

Speed controller P gain adaptation speed lower

Speed controller Kp adaptation speed, upper scaling

Speed controller integral time adaptation speed lower

Speed controller Tn adaptation speed, upper scaling

Speed controller adaptation speed lower

Speed controller adaptation speed upper

Speed control configuration: Automatic Kp/Tn adaptation active

Setpoint channel and closed-loop control

7.4 Vector speed/torque control with/without an encoder