Extended setpoint channel
3.6 Ramp-function generator
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
81
Extended ramp-function generator tracking
The extended ramp-function generator tracking returns the ramp-function generator 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
1
and t
3
and the ramp-function generator
output is tracked to the actual speed value. This causes the drive to be accelerated to the
speed setpoint on the specified ramp-function generator ramp when the torque falls again to
M
L
(t
2
and t
4
).
2 versions can be used for the extended ramp-function generator tracking:
● The ramp-function generator tracking is always active (p1151.1 = 1). For load surges, the
output of the ramp-function generator is tracked to the actual value. The tracking ends for
setpoint zero.
● The ramp-function generator tracking is always active (p1151.2 = 1). For load surges, the
output of the ramp-function generator is tracked to the actual value. The tracking
continues for a polarity change.
Signal overview, function diagrams and important parameters
Signal overview (see SINAMICS S120/S150 List Manual)
● Control signal STW1.2 OFF3
● Control signal STW1.4 Enable ramp-function generator
● Control signal STW1.5 Start/stop ramp-function generator
● Control signal STW1.6 Enable setpoint
● Control signal STW2.1 Bypass ramp-function generator
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