Droop - Siemens SINAMICS S120 Function Manual

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Vector control

6.5 Droop

● All coupled drives must be operated in vector control and closed-loop speed control, with or

without an encoder.

● Only a single common ramp-function generator may be used for mechanically coupled

Function description

The "Droop" function ensures that the speed setpoint is reduced proportionately as the load

torque increases. The function is enabled via parameter p1492.

Active only when the precontrol has been activated (p1496 > 0).

Only active for sensorless vector control (SLVC).

Speed controller with static injection

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

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Drive functions