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Assembly without additional safeguarding
The light transmitter (a)
(Figure 15/1)
and light receiver (b) together
produce a light curtain (c). If a light beam is interrupted, e.g. by a
human hand, the control circuit opens, thereby stopping the
machine's closure.
In this example, the ULCT/ BLCT safety light curtain cannot be
bypassed from the working side, eliminating the need for
additional safeguarding at the front.
Protection against infiltration from below and above
Cascading or additional safeguarding to prevent infiltration from the rear
15
2
Assembly
2.3
Installation conditions
Fig. 15/1: Assembly without additional safeguarding
Figures 15/2 a,b,c: Protection against infiltration from below and above
≤
75 mm
15/2.a
15/2.b
15/2.c
Fig. 15/3: Two cascaded safety light curtains to prevent infiltration from the rear
To prevent the protective field from being infiltrated
from the rear, the gap between the ULCT/ TLCT light
curtain and the machine must be
≤
75 mm.
In the normal operating procedure
(Figure 15/2a)
, the operator places workpieces in the seated position. To
allow for the machine's run-on time, the ULCT/ BLCT safety light curtain (a) is mounted at a distance before the
hazard zone
(refer to Chapter 2.2)
.
At the protection height selected here, an exposed gap results above the light curtain.
Figure 15/2b shows how reaching over the light curtain can cause an accident.
Figure 15/2c
shows how this can
be remedied by installing a ULCT/ BLCT safety light curtain providing a higher protective field.
If the gap between the vertical ULCT/ BLCT safety light curtain and the machine is larger than 75 mm
(e.g. to maintain a safety margin to the hazard zone), infiltration from the rear must be prevented by means
of an additional ULCT/ BLCT safety light curtain, two cascaded light curtains
(Figures 15/3 and 15/4)
or a
protective bar.
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E L E K T R O N I K
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Fiessler Elektronik GmbH & Co. KG
Telefon: +49 (0) 711 / 91 96 97-0 Internet: http://www.fiessler.de
Telefax: +49 (0) 711 / 91 96 97-50 eMail: [email protected]
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