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6
BLCT blanking functions
4.1
Additional safety notes
Additional safety notes for BLCT
a. Viability of the application: The viability of each application in the various possible operating modes must be examined. In
conjunction with the BPSG switching device, the BLCT light curtain offers a number of functions. The viability of each function must
be assessed individually for each application. Here, it is important to ascertain whether and how the blanked sectors can be
safeguarded by means of additional mechanical systems, and to examine the installation of the machine / equipment from this
perspective. Individual configurations must undergo safety checks by an expert.
b. Mechanical protection against infiltration: Auxiliary safeguards against infiltration installed besides the blanked machine
components must either be incapable of removal with the aid of simple tools, or monitored by means of position switches and
integrated into the safety routine.
c. Reaction time: Reaction times are somewhat longer compared with ULCT light curtains. Refer to Page 11 of Chapter 2.
d. Programming the blanking function: Blanking modes can be programmed either directly at the factory, or by the customer with
the help of devices of the PLSGK, BLPG and BPSG series. Refer to Page 28. Programming must only be performed by authorized
personnel. This must be ensured through use of a key switch. The switch must be stored at a secure location outside the
installation to prevent programming by unauthorized persons. Following completion of teach-in, the machine must not be permitted
to restart automatically. If start and restart interlock have not been implemented by the light curtain, they must be activated from a
higher level control system.
e. Key-switch installation point: The key switch must be installed at a point on the machine providing a clear view of the protective
field when the switch is operated.
f. Check the protective field after re-programming or replacing the receiver: Pass the test rod through the protective field once
directly before the transmitter, once directly before the receiver, and once halfway between the two (see Figure 25.4). The green
and yellow LEDs must remain off in this process. This is done to detect any deflection by reflective components initialized inside the
protective field.
g. Indication of current resolution and protective field: The current resolution must be indicated by auxiliary signs on the device.
When the light curtain is free, the LED for restart interlock (yellow) and the alignment LED (orange) must additionally flash at about
1 Hz to indicate reduced resolution mode or floating blanking mode. Reduced resolution influences the safety clearance and must
be taken into account.
h. Blanking must extend across the protective field's entire width to prevent infiltration from the side.
See Figures 25.1, 25.2 and 25.3
All safety notes in Chapter 7 must be observed on all accounts!
Incorrect use of the blanking function or improper integration of it into the machine's processes can pose serious
hazards. For this reason, it is extremely important to fully understand and meet the requirements for use of the
blanking function as described in this operating manual.
Usually, additional mechanical protective systems are needed to prevent access to hazardous zones resulting from
a bypass of blanked machine components.
If such additional mechanical protective systems are removed, measures must be implemented to deactivate the
machine.
Fig. 25.2: Fixed or floating blanking with partial
coverage of the light curtain's blanked section.
Additional coverage is necessary.
Fig. 25.3: Fixed or floating blanking with partial
coverage of the light curtain's blanked section.
Additional coverage is necessary.
S
E
Fig. 25.4: Traversing of the protective field
with an appropriate test rod.
Fig. 25.1: Fixed or floating blanking with
complete coverage of the light curtain's
blanked section..
Impermissible!
Impermissible!
Table of Contents
FIESSLER
E L E K T R O N I K
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]
Doku Nr. 1121 Stand 08.01. 2018 RK/Aui