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If the safety light curtain must be mounted in a horizontal position (see figure below)
the distance between the dangerous area and the most distant optical beam must be
equal to the value calculated using the following formula:
where:
•
S = Minimum safety distance in mm
•
t1 = Response time of the ESPE in seconds (see appendix "Technical Data".)
•
t2 = Machine stopping time in seconds (including the Safety Control System)
•
H = Beam height from ground; this height must always be less than 1,000 mm
Figure 5: Installation distance (horizontal positioning)
Practical examples
Let's suppose to have a light curtain with height = 600 mm
To calculate the distance of the device from the ESPE, in a vertical position, the follow-
ing formula is used:
where:
•
S = Minimum safety distance in mm
•
t1 = ESPE response time
•
t2 = Machine stopping time (including the Safety Control System)
•
T = (t1 +t2) Overall system stopping performance
•
C = 8 * (R - 14) for devices with resolution ≤ 40 mm
•
R = Resolution of the system
In all cases, if K = 2000 mm/s, then S > 500 mm.
Distance will have to be recalculated using K = 1600 mm/s.
NOTE: The reference standard is EN ISO 13855 "Safety of machinery -
Positioning of safeguards with respect to the approach speeds of parts of
the human body".
The following information is to be considered as indicative and concise.
For correct safety distance please refer to complete standard EN ISO 13855
S = 1600 mm/s (t1 + t2) + 1200 - 0.4 H
S = K*T + C
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