Siemens SINAMICS G110D, Operating Instructions Manual

Page: 116 / 224

Functions
6.6 Setpoint preparation
SINAMICS G110D
116
Operating Instructions, 07/2016, FW V3.63, A5E36768472B AB
6.6.3 Parameterizing the ramp-function generator
Parameterizing the ramp-function generator
The ramp-function generator in the setpoint channel limits the speed of setpoint changes.
This causes the motor to accelerate and decelerate more smoothly, thereby protecting the
mechanical components of the driven machine.
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 6- 27 Parameters for ramp-up time and ramp-down time
Parameters Description
P1120 = … Ramp-up time
Duration of acceleration (in seconds) from
zero speed to the maximum frequency
(P1082).
P1121 = … Ramp-down time
Duration of deceleration (in seconds) from
the maximum frequency (P1082) to
standstill.
The quick-stop function (OFF3) has a separate ramp-down time, which is set with P1135.
Note
If the ramp-up/down times are too short, the motor accelerates/decelerates with the
maximum possible torque and the set times will be exceeded.