Siemens SINAMICS S120 Function Manual page 78

Extended setpoint channel
3.6 Ramp-function generator
● Select ramp-function generator rounding type p1134[0...n]
– p1134 = "0": continuous smoothing; rounding is always active. Overshoots can occur.
– p1134 = "1": discontinuous smoothing; for a setpoint change, the change is
● Ramp-function generator configuration, deactivate rounding at zero point p1151[0...n]
● Freezing of the ramp-function generator using p1141 (not in jog mode r0046.31 = 1)
Scaling of the up ramp and the down ramp
In order to be able to influence the ramp times set in parameters p1120 and p1121 cyclically
via PROFIdrive telegrams, scaling is available for the ramp times.
● Using p1138[0...n], the signal source for scaling the ramp-up time p1120[0...n] of the
ramp-function generator is set.
● Using p1139[0...n], the signal source for scaling the ramp-down time p1121[0...n] of the
ramp-function generator is set.
The ramp times can be changed independently of one another in a cyclic PROFIdrive
telegram. If the ramp-up time and the ramp-down time are to be changed together, then the
scaling factor transferred in the PROFIdrive telegram is connected to both connectors.
The scaling also affects the initial and final rounding. However, it does not have the same
effect as in the acceleration ramp. This is the reason why an incorrect effective ramp-up time
is displayed. With scaling of approx. 50% to 200%, you get the most accurate effective ramp-
up times.
Override of the ramp-function generator
● Down ramp for Safety Integrated functions:
If Safety Integrated functions are activated and the down ramp is monitored, only the
OFF3 ramp according to p1135 is effective. The speed setpoint limit is selected using
p1051/p1052.
● Down ramp for the "Extended stop and retract" function module (ESR):
If ESR is activated, p0893 is used to enter the setpoint for the end speed of the ramp-
function generator. Instead of the ramp time of the ramp-function generator, ramp-down
is controlled using the OFF3 ramp.
Parameterization with STARTER
The "Ramp-function Generator" parameter screen is selected with the
of the STARTER commissioning tool.
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If the setpoint changes, final rounding is carried out and then the direction of the new
setpoint is adopted.
immediately made to the direction of the new setpoint.
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Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions