Siemens SINAMICS G120 Operating Instructions Manual page 273

5. Evaluate your drive response.
– If the motor decelerates too slowly, then reduce the ramp-down time.
– Extend the ramp-down time if the motor is braked too quickly or the converter goes into
6. Repeat steps 1 ... 5 until the drive behavior meets the requirements of the machine or plant.
You have set the extended ramp-function generator.
Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
The minimum ramp-down time that makes sense depends on your particular application.
Depending on the Power Module used, for an excessively short ramp-down time, the
converter either reaches the motor current, or the DC link voltage in the converter
becomes too high. Depending on the converter setting, the real braking time exceeds
the set ramp-down time, or the converter goes into a fault condition when braking.
a fault condition when braking.
Advanced commissioning
6.17 Setpoint calculation
273