SG4-H
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Interlock
: operating state of ESPE in Manual Restart Mode when all beams are free but the Restart command
hasn’t been received yet.
Normal Operation
: operating state of ESPE when all beams are free, OSSD LED lit GREEN in SL light curtain
OSSD1 and OSSD2 are switchen ON.
N.O.
: normally opened
N.C.
: normally closed
Machine operator
: qualified person allowed to use the machine.
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.
Working point
: machine position where the material or semifinished product is worked.
Receiver (RX)
: 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.
Crossing hazard
: situation under which an operator crossing the area controlled by the safety device and this
latter stops and keeps the machine stopped until the hazard is eliminated, and then enters the dangerous area.
Now the safety device could not be able to prevent or avoid an unexpected restart of the machine with the operator
still present inside the dangerous area.
Risk
: probability of occurrence of an injury and severity of the injury itself.
Block condition (=BREAK)
: status of the light curtain taking place when a suitably-sized opaque object (see
cfr.XREF-1:313]) interrupts one or several light curtain beams.
Under these conditions, OSSD1 and OSS2 light curtain outputs are simultaneously switched OFF within the device
response time.
Safe State
: operating state of ESPE when at least one beam is intercepted, OSSD LED lit RED in [INLINE-1:44
light curtain. OSSD1 and OSSD2 are both switched OFF.
Response time
: maximum time between the occurrence of the event leading to the actuation of the sensing
device and the output signal switching devices (OSSD) achieving the OFF-state
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) have 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 EN 61496-1: 2013) defines the
minimum requirements needed for ESPE design, manufacturing and testing.
Dangerous area
: area representing an immediate or imminent physical hazard for the operator working inside it or
who could get in contact with it.
