Siemens Sinumerik 840D sl Function Manual page 168

Safety functions integrated in the system/drive
6.6 Safe speed range identification "n<nx"
otherwise, Alarm 27033 "Axis %1 parameterization of MD
$MA_SAFE_VELO_X_HYSTERESIS invalid, error code %4" is issued. A cross-
wise data comparison error is only detected when the velocity deviation between
the two monitoring channels is greater than the tolerance in
$MA_SAFE_VELO_X_HYSTERESIS; Alarm 27001 or 27106 is then output and
the corresponding stop response is started.
The machine data $MA_SAFE_VELO_X_HYSTERESIS is subject to a crosswise
data comparison.
Hysteresis
Similarly, the new machine data 36947 $MA_SAFE_VELO_X_HYSTERESIS is
used to determine the magnitude of the hysteresis. As a result of the hysteresis,
the switching point of the SGA "n<n
consequence, the SGA "n<n
but instead, either at the n
the SGA stage in the last monitoring cycle.
Figure 6-17 Hysteresis SGA "n<
The SGA "n<n
Filtering
Filtering is realized using a PT1 filter with the filter time from
for 840D sl:
MD36945 $MA_SAFE_VELO_X_FILTER_TIME
for SINAMICS S120:
p9545 SI Motion SSM (SGA n < nx) filter time (Control Unit)
and is also performed in the two monitoring channels, NCK and drive.
6-168
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
" changes as a function of the speed. As a
x
" no longer precisely switches at the speed limit "n
x
threshold or at the n
x
"
nx
" can therefore never have the value 1 at a speed greater than "n
x
threshold tolerance depending on
x
Tol = $MA_SAFE_VELO_X_HYSTERESIS
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10/15
",
x
"!
x