Siemens SINUMERIK 840D sl Function Manual page 152

Safety integrated

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Safety functions integrated in the system/drive

7.6 Safe speed range detection "n<nx"

The machine data $MA_SAFE_VELO_X_HYSTERESIS is subject to a crosswise data

Similarly, the new MD36947 $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

precisely switches at the speed limit "n

threshold tolerance depending on the SGA stage in the last monitoring cycle.

The SGA "n<n

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 < n

and is also performed in the two monitoring channels, NCK and drive.

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

" changes as a function of the speed. As a consequence, the SGA "n<n

Hysteresis SGA "n<nx"

" can therefore never have the value 1 at a speed greater than "n

", but instead, either at the n

) filter time (Control Unit)

Function Manual, 12/2017, 6FC5397-4BP40-6BA1

threshold or at the n

Safety Integrated