Siemens Sinumerik 840D sl Function Manual page 167

10/15
The following diagram shows possible different speed characteristics in the NCK
and drive, and the effect of synchronization and hysteresis on the SGA "n<n
+n
n
x
n
x tol
0
--n
x+Tol
--n
x
SGA "n<n " (NCK)
x
with
hysteresis
SGA "n<n " (DRV)
x
with
hysteresis
SGA "n<n "
x
with hysteresis
synchronized
Tolerance range: SGA "n<n
SGA "n<n
Figure 6-16 n<n value range with synchronization and hysteresis
x
CDC tolerance
As tolerance in the crosswise data comparison for the extended n
machine data $MA_SAFE_POS_TOL is not used, but instead
for 840D sl:
MD36947 $MA_SAFE_VELO_X_HYSTERESIS
for SINAMICS S120:
p9547 SI Motion SSM (SGA n<nx) speed hysteresis (CU)
This MD defines the maximum permissible velocity tolerance between the two
monitoring channels, and during ramp--up, a plausibility check is made to the
speed limit set in $MA_SAFE_VELO_X. In this case, the following must apply:
$MA_SAFE_VELO_X_HYSTERESIS ± 3/4 $MA_SAFE_VELO_X,
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Speed characteristic NCK
Speed characteristic, drive
" stage dependent on the SGA in the last monitoring cycle
x
" =1
x
Safety functions integrated in the system/drive
6.6 Safe speed range identification "n<nx"
Tol = $MA_SAFE_VELO_X_HYSTERESIS
".
x
t
functionality,
x
6-167