Control functions
7.6 Speed control (S)
SINAMICS V90, SIMOTICS S-1FL6
260
Operating Instructions, 04/2019, A5E36037884-007
Note
When p29003=4 and CMODE is "1", the drive is working in speed control mode. In this case
if ZSCLAMP is activated, the drive will switch to PTI control mode and PTI pulse input will
lead motor running under PTI control mode.
Note
For more information about the signal ZSCLAMP, refer to "DIs (Page 123)".
7.6.6
Ramp-function generator
The ramp-function generator is used to limit acceleration in the event of abrupt setpoint
changes and thus helps prevent load surges during drive operation.
The ramp-up time p1120 and ramp-down time p1121 can be used to set acceleration and
deceleration ramps separately. This allows a smoothed transition in the event of setpoint
changes.
The maximum speed p1082 is used as the reference value for calculating the ramp-up and
ramp-down times.
You can see the properties of the ramp-function generator from the diagram below:
S-curve ramp-function generator
You can also use the S-curve ramp-function generator by setting p1115 to 1. The S-curve
ramp-function generator is realized with the following parameters:
●
the acceleration (p1120) and deceleration (p1121) ramps
●
the initial (p1130) and final (p1131) rounding-off times
