Siemens SINAMICS S110 - Ramp-Function Generator

Drive functions
7.3 Function modules
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
283
7.3.7.9 Ramp-function generator
Description
The ramp-function generator is used to limit acceleration in the event of abrupt setpoint
changes, which helps prevent load surges throughout the drive train. The ramp-up time
p1120[D] and ramp-down time p1121[D] can be used to set mutually independent
acceleration and deceleration ramps. This allows a controlled transition to be made in the
event of setpoint changes.
The maximum speed p1082[D] is used as a reference value for calculating the ramps from
the ramp-up and ramp-down times. A special adjustable ramp can be set via p1135 for quick
stop (OFF3), e.g. for rapid controlled deceleration when an emergency OFF button is
pressed.
There are two types of ramp-function generator:
● Basic ramp-function generator with
– Acceleration and deceleration ramps
– Ramp for quick stop (OFF3)
– Tracking configurable via parameter p1145
– Setting values for the ramp-function generator
● The extended ramp-function generator also has
– Initial and final rounding off
Note
The ramp-function generator cannot be frozen (via p1141) in jog mode (r0046.31 = 1).
Properties of the basic ramp-function generator
7GQ7XS
7GQ7XS
S
S
[
S
S
W
\
W
Figure 7-64 Ramp-up and ramp-down with the basic ramp-function generator
● RFG ramp-up time Tup p1120[D]
● RFG ramp-down time Tdn p1121[D]
● OFF3 deceleration ramp
– OFF3 ramp-down time p1135[D]