HB-37350-810-01-50F-EN PSC1-C-10 Installation manual V2.1.docx Page 67 of 189
Version: 50F
4.2.2.5 Safety-related shutdown thresholds, encoder systems for position and speed
acquisition
As a basic measure, plausibility tests between the two measurement channels A and B for
speed and position on the PSC1 module are undertaken with the actual values for position and
speed and tested against configured thresholds.
The incremental shutdown threshold describes the position deviation that can be tolerated
between the two acquisition channels A and B in the measurement section unit.
The speed shutdown threshold describes the speed deviation that can be tolerated between
the two acquisition channels A and B.
Diagnostic functions are available in the SCOPE dialogue box in the parameter configuration
tool to determine the optimal parameter values for the application.
Note:
Speed and acceleration are acquired values with a minimum digital resolution.
This situation limits the smallest possible speed or acceleration that can be acquired and
defines the digital step size for the input values.
Speed resolution:
The speed is acquired down to a frequency of 500 Hz or
500 steps/s using the frequency measurement method, below that using a time measurement
method. This situation produces the curve shown below for the acquisition error:
Acceleration resolution
The digital resolution of the acceleration is limited by the maximum gate time of 256 ms and
the resolution of the encoders. The graph below shows the lowest acceleration that can be
measured as a function of the resolution in rev/min, mm/s² and m/s².
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