Vector control
5.5 Droop
Drive functions
230 Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Droop (enabled via p1492) ensures that the speed setpoint is reduced proportionally as the
load torque increases.
Active only when the precontrol has been activated (p1496 > 0)
Figure 5-11 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
slipping.
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.
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