Siemens SINAMICS DCM Operating Instructions Manual page 405

Ramp-function generator mode of operation
= Ramp-function generator setpoint
RUT = Rampup time
IR = Initial rounding
1) Transition from ramp-down incline to ramp-up incline
2) Initial rounding makes the transition to final rounding even before the maximum ramp-down incline is reached.
3) Only the last part of final rounding is performed here due to the ramp-function generator setpoint jump.
Figure 10-35 Ramp-function generator mode of operation
SINAMICS DCM DC Converter
Operating Instructions, 1.2012, C98130-A7066-A1-05-7619
= Ramp-function generator output
RDT = Ramp-down time
FR = Final rounding
Descriptions of functions
10.9 Setpoint channel
403