Mounting
Leuze electronic
MLC 510 AS-i Host/Guest
25
Calculation example
The danger zone in front of a machine with a stopping time of 140 ms is to be safeguarded as close to the
floor height as possible using a horizontal safety light curtain as a replacement for a PS mat. Installation
height H
min
can be = 0 - additional distance C to the safety distance is then 1200 mm. The shortest possible
safety sensor is to be used; the first value to be selected is to be 1350 mm.
The receiver with 40 mm of resolution and 1350 mm protective field height has a response time of 13 ms,
an additional relay interface a response time of 10 ms.
Ä
Calculate safety distance S
RO
using the formula acc. to EN ISO 13855.
K
[mm/s]
=
1600
T
[s]
=
(0.140 + 0.013 + 0.010)
C
[mm]
=
1200
S
[mm]
=
1600 mm/s × 0.163 s + 1200 mm
S
[mm]
=
1461
The safety distance of 1350 mm is not sufficient; 1460 mm are necessary.
This is why the calculation is repeated with a protective field height of 1500 mm. The response time is now
14 ms.
Ä
Re-calculate safety distance S
RO
using the formula acc. to EN ISO 13855.
K
[mm/s]
=
1600
T
[s]
=
(0.140 + 0.014 + 0.010)
C
[mm]
=
1200
S
[mm]
=
1600 mm/s × 0.164 s + 1200 mm
S
[mm]
=
1463
A suitable safety sensor has been found; its protective field height is 1500 mm.