Dynamic Servo Control (Dsc) - Siemens Sinamics S120 Function Manual

Servo control

3.15 Dynamic Servo Control (DSC)

● p1244[0...n] DC link voltage threshold, upper
● p1248[0...n] DC link voltage threshold, lower
● p1250[0...n] Vdc controller proportional gain
3.15 Dynamic Servo Control (DSC)
The function Dynamic Servo Control" (DSC) is a closed-loop control structure which is
computed in a fast speed controller clock cycle and is supplied with setpoints by the control
in the position controller clock cycle.
This allows higher position controller gain factors to be achieved.
If the drive reaches its torque limits when in the DSC mode, e.g. because of excessively fast
setpoint inputs, then positioning motion can be overshot. With this so-called wind-up effect,
the drive overshoots the specified target, the control enters a specific correction, the drive
reverses, again overshoots the target, etc. In order to avoid this behavior, the drive limits the
position controller to values, which the drive can always reliably maintain depending on the
acceleration capability. Set p1400.17 = 1 in order to activate dynamic setpoint limiting in the
DSC mode. In this case, the total weight (m
the weight p0341, p0342 and p1498 possibly using the mot ID). If the limiting responds then
this is indicated in r1407.19. On this topic, also observe the description of parameter
p1400.17 and function diagram 3090.
Preconditions
The following prerequisites are necessary to use the "Dynamic Servo Control" function:
● n-set mode
● Isochronous PROFIBUS DP or PROFINET IO with IRT
● The position controller gain factor (KPC) and the position deviation (XERR) must be
● The position actual value must be transferred to the master in the actual value telegram
● When DSC is activated, the speed setpoint N_SOLL_B from the PROFIdrive telegram
● The internal quasi position controller, DSC position controller (FP5030), use the position
The following PROFIdrive telegrams support DSC:
● Standard telegrams 5 and 6
● SIEMENS telegrams 105, 106, 116, 118, 125, 126, 136, 138, 139
118
included in the setpoint telegram of PROFIBUS DP or PROFINET IO with IRT (refer to
P0915).
of PROFIBUS DP or PROFINET IO with IRT via the encoder interface Gx_XIST1.
from PROFIBUS DP or PROFINET IO with IRT is used as a speed pre-control value.
actual value G1_XIST1 from the motor measuring system or the position actual value
from an additional encoder system (telegrams 6, 106, 116, 118, 136 and 138 or free
telegrams).
) must be precisely parameterizing (determine
tot
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions