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Operating Instructions
LE 20
8 008 685/Q913/2007-05-21
Safety notes
2.3
General safety instructions and protective
measures
The LE20 complies with the requirements in the standard on the
radiated emissions as defined for class A (industrial application);
the LE20 is therefore only suitable for use in an industrial
environment.
The following sections must be observed to ensure that the device
is used for its specified purpose.
2 . 3 . 1
Ensuring the protective function of LE 20 and
LE 20 Muting
The protective function is only assured if the following conditions
are fulfilled:
1 . The reset and override pushbuttons connected to the LE 20 to
cancel the restart interlock must be arranged such that they
cannot be pressed from within the danger zone.
2 . The entire danger zone must be visible from the position of the
reset and override pushbuttons.
3. The external power supply to the devices must be capable of
withstanding a short-term power failure of 20 ms in accordance
with EN 60204. Suitable power supply units are available from
SICK as accessories (Siemens series 6 EP 1).
4 . Testing before initial start-up serves the purpose of confirming
that the safety requirements demanded by national/internatio-
nal regulations, in particular the Machinery Directive and
Provision and Use of Work Equipment Directive, are fulfilled (EC
declaration of conformity).
5 . The photoelectric switches shall be configured such that, if at
least one light beam is interrupted, the hazardous point is
reached only when the hazardous state has been negated. This
requires that the necessary safety distances according to EN
999 are adhered to.
6 . The OSSD outputs of the LE 20 must be connected to positively-
guided relays.
7. The protection device should be moved or adjusted only by
competent and trained persons.
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
GB
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