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Les langues disponibles
PRINCIPLE OF OPERATION
LIGHT CURTAIN / LIGHT GRID
If the guarded area is clear, the two outputs on the Receiver are active and permit normal
functioning of the machine connected to these.
When an object larger than or equal to the resolution of the system interrupts the sensing field of
one or more beams, the Receiver de-activates its outputs.
This condition makes it possible to block the dangerous movement of the machine (using a
suitable machine stop circuit).
Resolution is the smallest diameter object that will be reliably detected by at least one of the
optical beams generated by the light curtain / light grid (Figure 1).
Emitter
Resolution is constant regardless of working conditions as it depends only on the geometrical
characteristics of the lenses and the center distance between two adjacent lenses. The height of
the guarded area is the height effectively protected by the safety light curtain/-grid. If the system
is positioned horizontally, this value indicates the depth of the guarded zone. The useful range is
the maximum operating distance that can exist between the Emitter and Receiver.
Light curtains SLC 415 I are available with the following resolutions:
30mm (protected heights from 310mm to 1210mm)
•
PROTECTION OF THE HANDS
40mm (protected heights from 310mm to 1810mm)
•
PROTECTION OF THE HANDS
90mm (protected heights from 310mm to 1810mm)
•
PROTECTION OF THE LIMBS
Light grids SLG 415 are also available in a Multibeam version with a pitch between the lenses of:
500mm (2 beams), 400mm (3 beams), 300mm (4 beams – only SLG 415 I)
•
PROTECTION OF THE BODY.
MUTING FUNCTION
The Muting function generates a temporary, automatic interruption of safety light curtain
function in order to permit normal transit of material through the guarded opening.
The Muting function is activated when the system detects the object that interrupts the protected
opening. In other words, when the system recognizes the material and distinguishes between this
and any operator (in a potentially dangerous situation), it is enabled to bypass the light
curtain/light grid temporarily, allowing the material to pass through the opening.
The Muting sensors – which can be integrated in the light curtain/grid (systems SLG 415 L and
SLG 415 T) or be external (SLC/SLG 415 I) – form the sensing system that decides whether the
Muting function is to be activated (or not). Control of the dangerous opening can be de-activated
only by a correct sequence of interruption of the beams of the Muting sensors.
The system is available in the SLG 415 L and SLG 415 T models (with 2 integrated opto-
electronic sensors) and SLC/SLG 415 I models to which 2 or 4 sensors of various type can be
connected (proximity, optical, capacitive etc).
Receiver
Opaque Object
Figure 1 – Light curtain / light grid resolution
P = Pitch between two lenses
D = Diameter of one lens
R = Resolution = P+D
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