Siemens SINAMICS S150 NEMA, Operating Instructions Manual

Page: 475 / 862

Setpoint channel and closed-loop control
7.4 Vector speed/torque control with/without an encoder
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
473
If these supplementary conditions are in line with the application, the starting time can be
used as the lowest value for the ramp-up or ramp-down time.
Note
Setting the ramp-function generator
The ramp-up and ramp-down times (p1120; p1121) of the ramp-function generator in the
setpoint channel should be set accordingly so that the motor speed can track the setpoint
during acceleration and braking. This will optimize the function of speed controller pre-
control.
The acceleration precontrol using a connector input (p1495) is activated by the parameter
settings p1400.2 = 1 and p1400.3 = 0. p1428 (dead time) and p1429 (time constant) can be
set for balancing purposes.
Function diagram
FP 6031 Precontrol balancing reference/acceleration model
Parameters
•
p0311
Rated motor speed
•
r0333
Rated motor torque
•
p0341
Motor moment of inertia
•
p0342
Ratio between the total and motor moment of inertia
•
r0345
Rated motor startup time
•
p1400.2 Acceleration pre-control source
•
p1428
Speed pre-control balancing dead time
•
p1429
Speed pre-control balancing time constant
•
p1496
Acceleration pre-control scaling
•
r1518
Acceleration torque