Siemens SINAMICS S150 NEMA, Operating Instructions Manual

Page: 447 / 862

Setpoint channel and closed-loop control
7.2 Setpoint channel
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
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The ramp-up time (p1120) can be scaled using connector input p1138, the ramp-down time
(p1121) using connector input p1139. Scaling is deactivated in the factory setting.
Note
Effective ramp-up time
The effective ramp-up time increases when you enter initial and final rounding times.
Effective ramp-up time = p1120 + (0.5 x p1130) + (0.5 x p1131)
Signal flow diagram
Figure 7-3 Signal flow diagram: Ramp-function generator
Ramp-function generator tracking
If the drive is in range of the torque limits, the actual speed value moves away from the
speed setpoint. The ramp-function generator tracking updates the speed setpoint in line with
the actual speed value and so levels the ramp.
p1145 can be used to deactivate ramp-function generator tracking (p1145 = 0) or to set the
permissible deviation (p1145 > 1). If the permissible deviation is reached, then the speed
setpoint at the ramp-function generator output will only be increased further in proportion to
the speed setpoint.
Parameters p1151.1 and p1151.2 can be used to set as to whether ramp-function generator
tracking is realized with or without polarity change.
Parameter r1199.5 displays whether the ramp-function generator tracking is active.