When devices with > 40 mm resolution are used, the height of the top beam has to be ≥ 900 mm (H2) from
machine supporting base while the height of the bottom beam has to be ≤ 300 mm (H1).
If the safety light curtain must be mounted in a horizontal position (Fig 4 - page 13) the distance between the
dangerous area and the most distant optical beam must be equal to the value calculated using the following
formula:
S = 1600 mm/s (t1 + t2) + 1200 - 0,4 H
where:
Minimum safety distance in mm.
Response time of the ESPE in seconds (cfr. TECHNICAL DATA page 49)
Machine stopping time in seconds (including the Safety Control System)
Beam height from ground; this height must always be less than 1,000 mm.
Fig 4 - 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 following formula is used:
S = K*T + C
where:
Minimum safety distance in mm.
Machine total stopping time (Including safety control system).
(t1 + t2) Overall system stopping performance
8 * (R – 14) for devices with resolution <= 40 mm
In all cases, if K = 2000mm/sec then S will be > 500 mm.
Distance will have then to be recalculated using K = 1600 mm/sec.
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.
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