Omron F3SG RE Series Quick Installation Manual page 15

When Tm = 0.05 s, Ts = 0.008 s, a = 1,400 mm, b = 1,500 m:
From the table above, Cro = 850 mm. Since b is between 1,400 mm and 1,600 mm, b = 1,400 mm which has
the greater Cro value, shall be used.
S = 2,000 mm/s × (0.05 s + 0.008 s) + 850 mm
= 966 mm
Since 966 mm is greater than 500 mm, use K = 1,600 mm/s and recalculate it.
S = 1,600 m/s × (0.05 s + 0.008 s) + 850 mm
= 942.8 mm
Compare S = 942.8 mm with the calculation for Detection Zone Orthogonal to Direction of Approach, and
choose the larger value as the safety distance.
For the system with a detection capability of 40 mm max., the safety distance S is 942.8 mm since this is larger
than S = 116 mm calculated in the calculation example of Detection Zone Orthogonal to Direction of Approach.
For the system with a detection capability larger than 40 mm, the safety distance S is 942.8 mm since this is
the same value as S = 942.8 mm calculated in the calculation example of Detection Zone Orthogonal to
Direction of Approach.
Refer to Detection Zone Orthogonal to Direction of Approach under 9-1. Safety Distance Formulas according to ISO 13855/EN
ISO 13855 .
Detection Zone Parallel to Direction of Approach
Use K = 1,600 mm/s and C = (1200 - 0.4 x H) in formula
(1) for calculation. Note that C must not be less than 850 mm.
S = 1,600 mm/s x (Tm + Ts) + 1200 - 0.4 x H
• S = Safety distance (mm)
• Tm = Machine's response time (s)
• Ts = Response time of F3SG-R from ON to OFF (s)
• H = Installation height (mm)
Note that H must satisfy:
1000 ≥ H ≥ 15 (d - 50 mm) ≥ 0 mm
Also, you must include a hazardous condition under which
a person may go through under a detection zone if H
exceeds 300 mm (200 mm for other purpose than indus-
trial use) into risk assessment.
[Calculation example]
When Tm = 0.05 s, Ts = 0.008 s, and d = 14 mm:
S = 1,600 mm/s x (0.05 s + 0.008 s) + 1200 - 0.4 x 500 mm
= 1092.8 mm
When a warning zone is configured as in the figure, you must calculate L, a distance from an end of casing to
a detection zone, using a formula below:
L = (Total number of F3SG-R beams - number of warning
zone beams - 1) x P + 10
P: Beam Gap (mm)
F3SG-RA-14 . . . 10 mm
F3SG-RA-30 . . . 20 mm
Refer to F3SG-R Series User's Manual for total number of F3SG-
R beams.
F3SG-RE
Quick Installation Manual
Safety distance (S)
Hazard
Safety
distance (S)
Hazard
Detection
Warning
zone zone
Distance L from casing end
to detection zone
H
14