Siemens SINAMICS G120 Operating Instructions Manual page 238

Setting functions
8.4 Setpoint calculation
Extended ramp-function generator
The ramp-up and ramp-down
times of the extended ramp-
function generator can be set
independently of each other.
The optimum times that you
select depend on your
particular application in
question and can range from
just a few 100 ms (e.g. for belt
conveyor drives) to several
minutes (e.g. for centrifuges).
Initial and final rounding
permit smooth, jerk-free
acceleration and braking.
The ramp-up and ramp-down times of the motor are increased by the rounding times:
• Effective ramp-up time = p1120 + 0.5 × (p1130 + p1131).
• Effective ramp-down time = p1121 + 0.5 × (p1130 + p1131).
Table 8- 19
Parameter
p1115
p1120
p1121
p1130
p1131
p1134
p1135
p1136
p1137
238
Additional parameters to set the extended ramp-function generator
Description
Ramp-function generator selection (factory setting: 0)
Select ramp-function generator:
0: Basic ramp-function generator
1: Extended ramp-function generator
Ramp-function generator, ramp-up time (factory setting: 10 s)
Accelerating time in seconds from zero speed up to the maximum speed p1082
Ramp-function generator, ramp-down time (factory setting: 10 s)
Braking time in seconds from the maximum speed down to standstill
Ramp-function generator initial rounding time (factory setting: 0 s)
Initial rounding for the extended ramp-function generator. The value applies for ramp
up and ramp down.
Ramp-function generator final rounding time (factory setting: 0 s)
Final rounding for the extended ramp-function generator. The value applies for ramp
up and ramp down.
Ramp-function rounding type (factory setting: 0)
0: Continuous smoothing
1: Discontinuous smoothing
OFF3 ramp-down time (factory setting: 0 s)
The quick stop (OFF3) has its own ramp-down time.
OFF3 initial rounding time (factory setting: 0 s)
Initial rounding for OFF3 for the extended ramp-function generator.
OFF3 final rounding time (factory setting: 0 s)
Final rounding for OFF3 for the extended ramp-function generator
Converter with the CU250S-2 Control Unit (vector)
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB