Baumer FLDK 110G1005/S42 Manual do utilizador - Página 18
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9.2
False pulse suppression
It is generally recommended that the SCATEC-2 should be operated with the false pulse suppression
feature active. In this way, multiple pulses caused by thicker copies (newspapers, folded cardboard boxes
etc.) or by a small crease at the edge can be suppressed.
The false pulse suppression feature ensures that no further pulses can be issued when an output pulse
is active and during the dead time. Activating the false pulse suppression feature causes the sensor to
automatically initiate a dead time when each pulse is issued, whose duration is 18% of the average
overlap spacing. If an output pulse is followed by another in less than about 1/6 of the current average
overlap spacing time, this pulse is suppressed, as it lies within the dead time of the preceding pulse. The
average overlap spacing time is constantly recalculated automatically by the SCATEC-2. This ensures
that the dead time is adjusted if the conveying speed changes. In certain cases, one edge may be
suppressed if the conveying speed is very quickly accelerated, whereas one false impulse may not be
suppressed during very fast braking. However, gaps in the overlapping stream caused when individual
copies are removed or when the overlapping stream is briefly diverted have no effect. The false pulse
suppression feature has no effect on the maximum counting rate as the dead time is shortened as the
counting frequency rises and can even become shorter than the output pulse length. This occurs when
the average copy spacing time becomes less than 6 times of the output pulse length.
Ideally, the sensor would not issue further pulses after a valid output pulse for a specific length, as the
typical distance between two edges is often known regardless of the speed. Anything between these
would be false pulses. However, to allow the sensor to suppress pulses for a specific length and not for
a defined time, it must be synchronized to the conveying speed. This is possible with the Scatec-10 and
Scatec-15.
Always switch on false pulse suppression unless the overlap spacing is highly unregular.
Individual copies may be ignored during abrupt acceleration or if the overlap spacing suddenly
becomes smaller.
Manual SCATEC-2
Version 2021-09
18
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Baumer Electric AG
Frauenfeld, Switzerland