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cegard/Lift LX/LY
5.4
Description of light curtain component
The cegard/Lift operates like a through-beam sensor.
It consists of an emitter edge which emits a multitude of
individually-pulsed infrared light beams (Figure 5).
Control unit plug-in
Figure 5:
Schematic diagram of light curtains
These light beams are received by the receiver edge,
converted to electrical signals and transmitted to the
control unit plug-in. This signals the interruption of a light
beam to its outputs.
5.4.1
Calibration
During calibration the control unit plug-in measures the
transmission output required for each individual light beam
to actuate the respect receivers. The value determined in
this test is increased by approx. 100% and saved for normal
operation. Calibration substantially prevents all too common
reflection in through-beam sensor systems, replacing the
bundling (concentration) of the optical aperture angle usual
in other light barrier systems. This greatly simplifies the
installation / adjustment of optical edges.
The calibration procedure takes between 0.5 and 2 s,
depending on the distance from the emitter and receiver
edges. Calibration is carried out during activation and by
pressing the "T" button on the control unit plug-in. The
control device automatically carries out a calibration if no
change occurs in the protective field during a period of
30 min. Extensive changes in light intensity (e.g. due to
cleaning, etc.) are identified within 3 s and calibrated.
5.4.2
Adjustment
No adjustments are necessary, thanks to the size of the
aperture angle of the optical elements used in the cegard/
Lift light curtain, provided the receiver edge is within the
aperture angle of the emitter edges, and vice-versa (Figure
6).
© CEDES | V 2.8
R
Figure 6:
Aperture angle and beam cross-section
5.4.3
Reflection
Reflections occur if reflective surfaces are located directly
opposite or in the vicinity of the monitoring level, e.g. a tiled
shaft wall (see Figure 7).
Reflective surface
Min. 5 cm
Tx
Optical axis
Figure 7:
Reflection
These reflections are eliminated to a large extent by
calibration, the use of the CEDES installation kit and
adherence to minimum distances.
The optical axis should be a minimum distance of 5 cm
from the edge of the cabin.
6.
Installation
6.1
Installation of opto edges
The following should be observed in general:
Do not mount the emitter and receiver edges twisted
through 180° (e.g. the opto edges' connection cables
must be conveyed upwards).
Tx
Rx
Figure 8:
Alignment of emitter / receiver
English
E
40°
Rx
Tx
Rx
9
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