Siemens SINAMICS S120 Function Manual page 79

Extended ramp-function generator tracking
The extended ramp-function generator tracking returns the RFG output to the actual speed
value when the drive reaches the torque limit. Consequently, the drive does not return to the
current limit but rather back on the set acceleration ramp to the original setpoint.
Figure 3-12 Extended ramp-function generator tracking
The additional torque starts to act at the times t
actual speed value. This causes the drive to be accelerated to the speed setpoint on the
specified RFG ramp when the torque falls again to M
Two variants can be used for the extended RFG tracking:
● The RFG tracking is always active (p1151.1 = 1). For load surges, the output of the ramp-
● The RFG tracking is always active (p1151.2 = 1). For load surges, the output of the ramp-
Drive functions
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
function generator is tracked to the actual value. The tracking ends for setpoint zero.
function generator is tracked to the actual value. The tracking continues for a polarity
change.
Extended setpoint channel
3.9 Ramp-function generator
and t and the RFG output is tracked to the
1 3
(t and t ).
L 2 4
79