Omron Sti F3SJ-E N25 Series User Manual page 58

Wiring/Installation
Possible circumventing by reaching over the detection zone
If access to the hazardous zone by reaching over the detection zone of vertically mounted F3SJ-E/B
cannot be excluded, the height and the safety distance, S, of the F3SJ-E/B shall be determined. S shall
be determined by comparison of the calculated values in Detection Zone Orthogonal to Direction of
Approach. The greater value resulting from this comparison shall be applied.
S=(K × T) + Cro . . . Formula (5)
•S: Safety distance
•K: Approach speed to the detection zone
•T: Total response time of the machine and F3SJ-E/B
•Cro: Approach distance based on the distance which
personnel can move towards the hazardous zone of a
machine by reaching over the detection zone. The distance
is determined in the table below based on the height of the
hazardous zone, a, and the height of the upper edge of the
detection zone, b.
Note:Lower edge of the detection zone above 300 mm in relation to the reference plane does not offer
sufficient protection against crawling below.
First, use K = 2,000 mm/s in formula (5) for the calculation. If the result of this calculation is less than
100 mm, use S = 100 mm.
If the result exceeds 500 mm, use K = 1,600 mm/s to recalculate it. If the result of the recalculation is
less than 500 mm, use S = 500 mm.
F3SJ-E/B
42
User's Manual
Safety
distance (S)
Hazard
b
a
300 mm max.
Reference plane