Application examples for conventional PSRclassic safety relays
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5.2 Light grids (ESPE)/laser scanners (AOPD)
Light grids
Light grids consist of a transmit and receive unit and have a two-dimensional monitoring
range. Light grids are electro-sensitive protective equipment used to protect operating per-
sonnel working on or in the vicinity of dangerous machines. The advantage over mechanical
systems is their non-contact and therefore maintenance-free function.
Observe the following when using light grids:
– The light grids must be mounted so that it is not possible to reach over, reach under,
and step behind the protective field. If this cannot be ensured, additional safety equip-
ment must be installed.
– The machine control system must be capable of being influenced electrically and permit
dangerous states to be exited immediately in each operating phase.
– The ambient conditions must not adversely affect the effectiveness of the light protec-
tive system.
– Electro-sensitive protective equipment does not provide protection from flying parts.
Relevant standards EN 61496-1, EN 61496-2: Requirements for electro-sensitive protective equipment
EN ISO 13855: Positioning of safeguards with respect to the approach speeds of parts of
the human body
Laser scanners
Laser scanners scan the shape of the environment like a type of optical radar. The distance
to an object is determined by a runtime measurement. A mirror integrated in the devices is
used to achieve two-dimensional scanning. The protective fields that are used for shutdown
in the event of a hazardous situation can be defined using software. As the distance
increases, the resolution of the scanner decreases and this therefore affects the required
minimum distance.
Examples of use – Protection of the danger zone for presses
– Protection of the danger zone for production cells
– Back step protection for insert areas of robot cells
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