Droop - Siemens SINAMICS S120 Function Manual

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Droop

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

load torque increases.

Speed controller with droop

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

speed (e.g. guide roller on a goods train). 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 overload and

limitation), this load distribution controls even a smooth mechanical coupling or the case of

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

connected mechanically or operate with a common shaft and fulfill the above requirements. It

limits the torque differences that can occur as a result of the mechanical coupling by

appropriately modifying the speeds of the individual motors. The drive is relieved when the

torque is too large.

Drive functions

Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3

Vector control