Ramp-Function Generator - Siemens SINAMICS G120 CU240B-2 Operating Instructions Manual

The maximum speed also acts as an important reference value for various functions (e.g. the

ramp-function generator).

Table 7- 11
Parameter
P1080
P1082
7.5.2 Ramp-function generator
The ramp-function generator in the setpoint channel limits the speed of changes to the
speed setpoint. The ramp-function generator does the following:
● The soft acceleration and braking of the motor reduces the stress on the mechanical
● Acceleration and braking distance of the driven machine (e.g. a conveyor belt) are
Ramp-up/down time
The ramp-up and ramp-down times of the ramp-function generator can be set independently
of each other. The times that you select depend purely on the 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).
When the motor is switched on/off via ON/OFF1, the motor also accelerates/decelerates in
accordance with the times set in the ramp-function generator.
Table 7- 12
Parameter
P1120
P1121
For more information about this function, see the List Manual (function diagram 3060 and the
parameter list).
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
Parameters for minimum and maximum speed
Description
Minimum speed
Maximum speed
system of the driven machine.
independent of the motor load.
Parameters for ramp-up time and ramp-down time
Description
Ramp-up time
Duration of acceleration (in seconds)
from zero speed to the maximum
speed P1082
Ramp-down time
Duration of deceleration in seconds
from the maximum speed P1082 to
standstill
Functions
7.5 Setpoint calculation
167