Mounting
Leuze electronic GmbH + Co. KG
MLC 530 SPG
56
Calculation example
The feeding-in area in a press with a stopping time of 130 ms is to be safeguarded with a safety light cur-
tain with 20 mm of resolution and 600 mm of protective field height. The response time of the safety light
curtain is 12 ms; the press Safety PLC has a response time of 40 ms.
The safety sensor can be reached over. The upper edge of the protective field is located at a height of
1400 mm; the point of operation is located at a height of 1000 mm
Additional distance C
RO
to the point of operation is 700 mm (see table “Reaching over the vertical protective
field of electro-sensitive protective equipment (excerpt from ISO 13855)”).
Ä
Calculate safety distance S
RO
using the formula acc. to ISO 13855.
K
[mm/s]
=
2000
T
[s]
=
(0.012 + 0.040 + 0.130)
C
RO
[mm]
=
700
S
RO
[mm]
=
2000 mm/s × 0.182 s + 700 mm
S
RO
[mm]
=
1064
S
RO
is larger than 500 mm; this is why the calculation may be repeated with approach speed 1600 mm/s:
K
[mm/s]
=
1600
T
[s]
=
(0.012 + 0.040 + 0.130)
C
RO
[mm]
=
700
S
RO
[mm]
=
1600 mm/s × 0.182 s + 700 mm
S
RO
[mm]
=
992
NOTICE
Depending on the machine construction, stepping behind protection, e.g. using a second hori-
zontally arranged safety light curtain, is necessary. In most cases, it will be more appropriate to
choose a longer safety light curtain which makes the additional distance C
RO
equal to 0.
