Leuze electronic MLC 500 - Safety distance calculations (orthogonal & parallel)

Mounting
Leuze electronic MLC 510 23
Ä Look for the next lowest value for real additional distance C
RO
in this column.
ð In this line, go to the left column: here you will find the permitted height of the point of operation.
Ä Now calculate safety distanceS using the general formula acc. to ISO13855 (see chapter 6.1.1 "Cal-
culation of safety distanceS").
ð The larger of the two values S
RT
and S
RO
is to be used.
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.