Ramp-Function Generator - Siemens Sinamics S120 Function Manual

2.9

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 complete drive train. The ramp-up
time p1120[0...n] and ramp-down time p1121[0...n] can be used to set mutually independent
up and down ramps. This allows a controlled transition to be made in the event of setpoint
changes.
The maximum speed p1082[0...n] is used as a reference value for calculating the ramps
from the ramp-up and ramp-down time. For a quick stop (OFF3), a special adjustable ramp
is available via the ramp-down time p1135[0...n] (e.g. for quick, controlled stopping after an
EMERGENCY OFF button has been pressed).
There are two types of ramp-function generator:
● Basic ramp-function generator with
● The extended ramp-function generator also has
Note
The ramp-function generator cannot be frozen (via p1141) in the jog mode (r0046.31 = 1).
Properties of the basic ramp-function generator
Figure 2-12
● Ramp-up time Tup p1120[0...n]
● Ramp-down time Tdn p1121[0...n]
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
– Acceleration and deceleration ramps
– Down ramp for quick stop (OFF3)
– Tracking configurable via parameter p1145
– Setting values for the ramp-function generator
– Initial and final rounding off
Ramp-up and ramp-down with the basic ramp-function generator
Extended setpoint channel
2.9 Ramp-function generator
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