SICK Bulkscan LMS511

OPERATING INSTRUCTIONS | Bulkscan LMS511 8014829/ZNC5/2017-06-06 | SICK
Subject to change without notice
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COMMISSIONING
System tab, Tolerances group
8.3.1 Tolerance against vibration
The majority of conveyor belts vibrate in operation as a function of the belt speed and
the load. If the empty conveyor belt vibrates, the conveyor will rise above or drop below
the taught-in reference contour. The Bulkscan would interpret this movement as a
change in the bulk quantity.
For this reason the Bulkscan has a Tolerance against vibrationthatcanbecongured.
In this case the sensor ignores conveyor belt variations from the bottom edge of the ref-
erence contour and outputs the measured value 0. However this situation also means
that very low bulk quantities are also ignored
How to congure the tolerance against vibration:
 Ensure that hazard-free operation is possible and start the empty conveyor belt.
 On the Operating modecongurationbar,clickMeasuringmode.
 Switch to the System tab.
 Reduce the Tolerance against vibration so that the Volume ow rate measured val-
ue remains constant at 0 with the empty conveyor belt.
 Check on the Measured valuecongurationbarwhethersmallbulkquantitiesare
reliably detected.
8.3.2 Tolerance against reection
Reections(totalreection)canresultintheBulkscanmeasuringthedistancetothe
reectedobject,e.g.,abuildingroof,insteadoftothebulk.Examples:
• Fragments of glass as bulk.
• Stagnant water on the conveyor belt.
In this case the distance values measured are way outside the reference area. In rela-
tion to the reference area, the Bulkscan interprets these values as measuring errors:
• The sensor replaces invalid distance values with the last valid distance value.
• The 7-segment display shows .
• Ifyouhaveconguredanoutputas"Information/Warnings",therelatedoutput
switches.
Youcanadjustthetoleranceagainstreectiontosuityourapplication.Thevaluede-
neswhichpartofthemeasuredbulkcontourmustlieoutsidethesensor-internaldis-
tance threshold for the contour to be interpreted as a measuring error. A high tolerance
againstreectionincreasestheavailabilityofthesensor.
If you want to detect stagnant water, the value should be low, because the edges of the
conveyor belt that are not covered form part of the contour.
How to congure the tolerance against reection:
 Ensure that hazard-free operation is possible and start the empty conveyor belt.
 On the Operating modecongurationbar,clickMeasuring mode.
 Switch to the System tab.
 Set the Tolerance against reection to a value of 50%.
 Reduce or increase the Tolerance against reection so that the availability of the
system meets your requirements.
8.3.3 Optimization for outdoor applications
Dustparticles,raindrops,snowakes,etc.canblockindividualmeasurementpoints
onthebulkcontour.Dazzlefromexternallightsources,suchassunshineorreections
Recommandation