87
N.O.:
normally opened
N.C.:
normally closed
OFF STATUS:
status when the output circuit is interrupted and does not allow current stream.
ON STATUS:
status when the output circuit is operational and allows current stream.
OUTPUT SIGNAL SWITCHING DEVICE (OSSD):
part of the ESPE connected to machine control system.
When the sensor is enabled during standard operating conditions, it switches to disabled status.
PROTECTED AREA:
area where a specified test object is detected by the ESPE.
PROTECTIVE DEVICE:
device having the function to protect the operator against possible risks of injury due
to the contact with machine potentially-dangerous parts.
QUALIFIED OPERATOR:
a person who holds a professional training certificate or having a wide knowledge
and experience and who is acknowledged as qualified to install and/or use the product and to carry out
periodical test procedures.
RECEIVER:
unit receiving infrared beams, consisting of a set of optically-synchronised phototransistors. The
receiving unit, combined with the emitting unit (installed in the opposite position), generates an optical
“curtain”, i.e. the detecting area.
RESOLUTION:
see “Detecting capacity” in the glossary.
RESPONSE TIME:
max. time elapsing between the occurrence of the event leading to sensor activation and
the reaching of the inactive state by the output signal switching device (OSSD).
RESTART:
see “Restart Interlocking Device” in the glossary.
RESTART INTERLOCKING DEVICE:
device preventing machine automatic restart after sensor activation
during a dangerous phase of machine operating cycle, after a change of machine operating mode, and after
a variation in machine start control devices.
RISK:
probability of occurrence of an injury and severity of the injury itself.
SAFETY LIGHT CURTAIN:
it is an active optoelectronic protective device (AOPD) including an integrated
system consisting of one or several emitting elements and one or several receiving elements forming a
detection area with a detecting capacity specified by the supplier.
START INTERLOCKING DEVICE (= START):
device preventing machine automatic start if the ESPE is live
or the voltage is disabled and enabled once again.
TEST PIECE:
opaque object having a suitable size and used to test safety light curtain correct operation.
TYPE (OF ESPE):
the Electro-sensitive Protective Equipment (ESPE) has different reactions in case of
faults or under different environmental conditions. The classification and definition of the "type" (ex. type 2,
type 4, according to IEC 61496-1) defines the minimum requirements needed for ESPE design,
manufacturing and testing.
WORKING POINT:
machine position where the material or unfinished product is worked.
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