Ramp-Function Generator - Siemens SINAMICS V90 Operating Instructions Manual

Control functions
7.5 Speed control (S)
7.5.6

Ramp-function generator

The ramp-function generator is used to limit acceleration in the event of abrupt setpoint
changes and thus helps prevent load surges during drive operation.
The ramp-up time p1120 and ramp-down time p1121 can be used to set acceleration and
deceleration ramps separately. This allows a smoothed transition in the event of setpoint
changes.
The maximum speed p1082 is used as the reference value for calculating the ramp-up and
ramp-down times.
You can see the properties of the ramp-function generator from the diagram below:
S-curve ramp-function generator
You can also use the S-curve ramp-function generator by setting p1115 to 1. The S-curve
ramp-function generator is realized with:
● the acceleration (p1120) and deceleration (p1121) ramps
● the initial (p1130) and final (p1131) rounding-off times
You can see the properties of the S-curve ramp-function generator from the diagram below:
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SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 07/2015, 6SL3298-0AV60-0BP0