Installation
Leuze electronic SOLID-2 23
TNT 35/7-24V
Review-Stand, , 8. April 2015
DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS
Calculation example for safeguarding danger points:
A light curtain with a resolution of 20 mm, protective field height 1500 mm is used on a
machine with a stopping time of 150 ms. The response time of the safety interface is
20
ms.
Make certain during assembly that it is not possible to reach over, around or under or to
walk behind the
protective device.
5.1.2 Safety distance for safeguarding danger areas
Calculation of the safety distance and required resolution for a Safety Light Curtain to
secure danger areas.
*) If this value can not be achieved because of the safety distance, other measures, e.g. mechanical
barriers, must guarantee for that required maximum distance of 75 mm.
Stopping time of the machine t
Machine
= 150 ms
Response time t
AOPD
= 49 ms
Response time t
Interface
= 20 ms
Resolution d of the AOPD = 20 mm
T = 0.150 s + 0.049 s + 0.020 s = 0.219 s
S = 2000 x 0.219 + 8 x (20 -14) = 486 mm
a = Safety distance (S)
b = Measures to prevent access from the sides
c = Height above the reference plane
d = max. distance < 75 mm*
Fig. 5.1-2: Safety distance (a) and height (c) for safeguarding danger areas
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