Ramp-Function Generator - Siemens SINAMICS G110M Operating Instructions Manual

8.17.6

Ramp-function generator

The ramp-function generator in the setpoint channel limits the rate change of the speed setpoint
(acceleration). A reduced acceleration reduces the accelerating torque of the motor. In this case,
the motor reduces the load on the mechanical system of the driven machine.
You can select between two different ramp-function generator types:
• Extended ramp-function generator
The expanded ramp-function generator limits not only the acceleration but also the change
in acceleration (jerk) by rounding the setpoint. In this case, the torque does not rise suddenly
in the motor.
• Basic ramp-function generator
The basic ramp-function generator limits the acceleration, however not the rate the
acceleration changes (jerk).
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 optimal times depend on the application, and can lie in the
range from a few 100 ms to several minutes.
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).
Distributed converter for SIMOGEAR geared motors
Operating Instructions, 10/2020, FW V4.7 SP13, A5E31298649B AL
Advanced commissioning
8.17 Setpoint calculation
275