BBH SCU Series, Installation Manual

Page: 105 / 303

10
Safety-related characteristics
HB-37500-810-11-16F-EN SCU Installation Manual - Master and Slaves - SARC Page 105 of 303
Status: 09.06.2022
10.2.2.5. Safety-related switch-off threshold encoder systems for position and speed
detection
Plausibility tests with the current position and speed values are performed between
both measuring channels A and B of the SCU module as a basic measure, which are
then checked against parameterizable thresholds.
The
incremental shut-down threshold describes the tolerable deviation of position
between both sensing channels A and B in the unit of the measuring distance.
The
speed shut-down threshold describes the tolerable deviation in speed between
both sensing channels A and B.
Diagnostic functions for the determination of optimal parameter values for the
applications are available within the SCOPE-dialog of the parameterization tool.
NOTE Speed and acceleration are detected values with a minimal digital
resolution.
This fact limits the smallest possible detection of speed or acceleration
and determines the digital step width for the input values.
Speed resolution:
Up to a frequency of 500 Hz or 500 steps/s speed is detected with the frequency
measuring method, below this it is measured with a time measuring method. This
results in the following course of the sensing fault:
Fig. 23 Course of fault in V-detection
0,0%
5,0%
10,0%
15,0%
20,0%
25,0%
30,0%
Fau
lt
in
%
Course of fault in V-detection
Frequency or steps/s