Siemens Sinumerik 840D sl Function Manual page 169

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If filtering is not necessary due to low system vibration levels or is impractical, it
can be deactivated by setting MD $MA_SAFE_VELO_X_FILTER_TIME to the
value 0.
MD $MA_SAFE_VELO_X_FILTER_TIME and the smoothed actual velocity value
with the tolerance from MD $MA_SAFE_VELO_X_HYSTERESIS are subject to
crosswise data comparison.
The smoothed, safe actual value of the NCK is also available in the servo trace.
Note
By parameterizing a filter time not equal to 0, the reaction time of the SGA "n<n
increases according to the behavior of a PT1 filter.
The maximum time delay of the SGA "n<n
decrease corresponds to the filter time parameterized in MD 36945.
Example:
Filter time = 20 ms => The parameterized n
20 ms. Accordingly the SGA n<n
The maximum time delay of the SGA "n<n
decrease corresponds to 3 times the filter time parameterized in MD36945.
Example:
Filter time = 20 ms => The parameterized n
60 ms. Accordingly the SGA n<n
Synchronization
The synchronization of the SGA "n<n
formed between the NCK and drive due to possible telegram failures (see Chapter
6.8.1), but instead, between the NCK and PLC by AND'ing the SGA "n<n
In order to ensure that a monitoring channel does not continuously return a 0 -- and
hence the SGA "n<n
crosswise data comparison between the NCK and drive and checked for plausibi-
lity.
For the display of the SGA "n<n
following applies:
The value displayed in the SGA word contains the information from the relevant
monitoring channel including the hysteresis that is applied, but without synchroni-
zation.
If the actual value synchronization function in $MA_SAFE_FUNCTION_ENABLE,
bit 3 is enabled, then the velocity tolerance slip with velocity tolerance "n<n
be checked for plausibility. If the velocity tolerance "n<n
tolerance, then Alarm 27033 "Axis %1 parameterization of MD
$MA_SAFE_VELO_X_HYSTERESIS invalid, error code %4" is issued.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Safety functions integrated in the system/drive
6.6 Safe speed range identification "n<nx"
" for a linear velocity increase/
x
is also set to delay.
x
" for an erratic speed increase/
x
is also set to delay.
x
", just like cam synchronization, is not per-
x
" would permanently remain at 0 -- SGA "n<n
x
" in the service screen and servo trace, the
x
limit is reached with a max. delay of
x
limit is reached with a max. delay of
x
x
" is less than the slip
x
"
x
".
x
" is subject to a
" must
x
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