Mounting
Leuze electronic
MLC 520 EX
23
Depending on the specified values you can work with the above-mentioned table (see table 6.1) in three
ways:
1. Given are
• Height a of the point of operation
• Distance S of the point of operation from the safety sensor, and additional distance C
RO
To be determined is the required height b of the upper beam of the safety sensor and thereby its protective
field height.
Look for the line with the specification of the point of operation height in the left column.
In this line, look for the column with the next highest specification for additional distance C
RO
.
The required height of the upper beam of the safety sensor is up top in the column head.
2. Given are
• Height a of the point of operation
• Height b of the upper beam of the safety sensor
To be determined is the required distance S of the safety sensor to the point of operation and thereby addi
-
tional distance C
RO
.
In the column head, look for the column with the next lowest entry for the height of the upper beam of
the safety sensor.
Look for the line with the next highest specification of the point of operation height a in this column.
In the intersection point of the line and the column, you will find additional distance C
RO.
3. Given are
• Distance S of the point of operation from the safety sensor, and additional distance C
RO
• Height b of the upper beam of the safety sensor
To be determined is the permitted height a of the point of operation.
In the column head, look for the column with the next lowest entry for the height of the upper beam of
the safety sensor.
Look for the next lowest value for real additional distance C
RO
in this column.
In this line, go to the left column: here you will find the permitted height of the point of operation.
Now calculate safety distance S using the general formula acc. to EN ISO 13855, see chapter 6.1.1
"Calculation of safety distance S".
The larger of the two values SRT or 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
curtain 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 6.1).
Calculate safety distance S
RO
using the formula acc. to EN 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:
S
RO
K T C
RO
+
=
