Sources Of Interference - ABB Busch E-contact System Manual

4.3

Sources of interference

4.3.1 Sources of interference
Switching is normally activated by persons moving. However, there are also foreign heat
sources that may cause unwanted activation. This should be taken into account during
planning.
Suspended light bands
Suspended light bands that have an indirectly radiating part to the top can cause problems for
ceiling presence detectors during the detection.
– The measurement of the reflected light from the floor or the table is affected unfavourably by
the light part that radiates to the top.
– Depending on the lamp used, possibly existing infrared parts in the light or the rising heat of
the lamp can affect the detection.
Remedy:
The presence detector must be located on the identical height level to the light band.
Limited view of the presence detector
Fig. 60: Sources of interference: limited view
The detection range of the presence detector may be obstructed by various objects, e.g.:
Lamp strips that have been installed lower than the Busch-Presence detector
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Large plants
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Partitions
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Glass panes, etc.
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System Manual 2CKA001473B9577
Information about planning and application
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