Siemens SINAMICS S120 Function Manual page 62

Extended setpoint channel
2.9 Ramp-function generator
● RFG ramp-up time Tup p1120[DDS]
● RFG ramp-down time Tdn p1121[DDS]
● Initial rounding-off time IR p1130[DDS]
● Final rounding-off time FR p1131[DDS]
● Rounding-off typep1134[DDS]
● Effective ramp-up time
● Effective ramp-down time
● OFF3 deceleration ramp
● Set ramp function generator
● Ramp function generator rounding-off type p1134[DDS]
● Ramp function generator configuration, deactivate rounding in zero transition p1151[DDS]
● Freezing of the ramp function generator using p1141 (not in jog mode r0046.31 = 0)
Ramp function generator tracking
If the drive is in the area of the torque limits, the actual speed value is removed from the
speed setpoint. The ramp function generator tracking updates the speed setpoint in line with
the actual speed value and so levels the ramp. p1145 can be used to deactivate ramp
function generator tracking (p1145 = 0) or set the permissible following error (p1145 > 1). If
the permissible following error is reached, then the speed setpoint at the ramp function
generator output will only be further increased in proportion to the speed setpoint.
Ramp function generator tracking can be activated for the simple and the extended ramp
function generators.
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Tup_eff = Tup + (IR/2 + FR/2)
Tdn_eff = Tdn + (IR/2 + FR/2)
OFF3 ramp-down time p1135[DDS]
OFF3 initial rounding p1136[DDS]
OFF3 end rounding p1137[DDS]
– Ramp function generator setting value p1144[CDS]
– Set ramp function generator signal p1143[CDS]
– p1134 = "0": continuous smoothing rounding is always active. Overshoots may occur.
If the setpoint changes, final rounding is carried out and then the direction of the new
setpoint is adopted.
– p1134 = "1": non-continuous smoothing changes immediately to the direction of the
new setpoint when the setpoint is changed.
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Drive Functions