Siemens SINAMICS S120 Function Manual page 134

Operating Modes
Vector control
Note
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 ensures that speed
controller pre-control is functioning optimally.
Acceleration pre-control via the connector input (p1495) is activated via parameter
settings p1400.2 = 1 and p1400.3 = 0. p1428 (dead time) and p1429 (time con-
stant) can be set for balancing purposes.
Reference model
Reference model pre-control
p 1433 p 1434
r 1084
–
Speed
setpoint
Actual speed
Fig. 3-33 Reference model
The reference model is activated when p1400.3 = 1 and p1400.2 = 0.
The reference model is used to emulate the path of the speed control loop with a
P speed controller.
The path emulation can be set in p1433 to p1435. It is activated when p1437 is
connected to the output of model r1436.
The reference model delays the setpoint-actual deviation for the integral compo-
nent of the speed controller so that transient conditions can be suppressed.
The reference model can also be emulated externally and its output signal injected
via p1437.
3-134
r 1436 p 1437
p 1435
–
T
i
Droop
injection
K
T
p
n
r 1515
I
PI speed
r 1547 [0]
P
controller
–
r 1547 [1]
T
i
SLVC: p 1452
VC: p 1442
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
r 1538
r 0079
Torque
setpoint
r 1539
T
K
p n
p 1470 p 1472
p 1460 p 1462