Ramp-Function Generator - Siemens SINAMICS G120C Operating Instructions Manual
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Also See for SINAMICS G120C:
- Operating instructions manual (478 pages) ,
- Compact operating instructions (92 pages) ,
- Getting started (68 pages)
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Advanced commissioning
6.4 Setpoint calculation
6.4.6
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.
As a consequence, the motor reduces the stress on the mechanical system of the driven
machine.
The extended ramp-function generator not only limits the acceleration, but by rounding the
setpoint, also acceleration changes (jerk). This means that the motor does not suddenly
generate a torque.
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).
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Operating Instructions, 07/2015, FW V4.7 SP3, A5E34263257B AC
SINAMICS G120C converter
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