16
outputs: one ESPE common point
is connected to S21, while the out-
puts are connected to S11 and
S22. The category of the applica-
tion can reach up to category 4
according to the EN954-1 and
EN13849-1 standards.
In Fig. 9 and 10 are shown the
connections of ESPE with 1 two-
wires output: one ESPE output
wire is connected to S21, while the
other is connected to S11 and S11
is short-circuited with S22.
The category of the application can
reach up to category 2 according
to the EN954-1 and EN13849-1
standards.
As the input switches, connected
to the S11 and S22 inputs are ope-
rated, the safety module is enabled
to close the safety outputs, in
manual START set-up, or closes
the safety outputs, in automatic
START set-up.
NOTE
To reach the safety category 4
the ESPE must be compliant with
the requirements of safety cate-
gory 4 according to EN 954-1 with
self-monitoring for the event of
short-circuit between its outputs:
in the event of short-circuit betwe-
en the ESPE safety outputs the
ESPE must switch off the safety
outputs.
NOTE
The ESPE + NLG13D724..
module system is part of the safe-
ty devices of the machine. For
safety category 2 applications
employing ESPEs with only one
output, the integrity and correct
behaviour of the system must be
monitored by the overall safety
system in which the ESPE and
the module are used (e.g. the
machine in which the ESPE is
installed or a safety supervisor).
To reach safety category 2 the
safety system must be checked
and monitored regularly. Self-
checking functions of the ESPE,
manual tests and regular mainte-
nance activities (see chapter 7)
must be performed by the user
with a frequency suited for the
risk of the application. The check
must be performed according to
the “TEST AND ACTIVATION”
chapter of this manual and accor-
ding to the checking procedures
of the ESPE user’s manual, simu-
lating on board the normal wor-
king cycle of the ESPE, interrup-
ting the ESPE beams and veri-
fying that the ESPE and the
module work correctly.