Safety Distance - Omron F3SJ-E0185P25 User Manual

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Safety Distance

The safety distance is the distance that must be set between the F3SJ-E/B and a machine's hazardous
part to stop the hazardous part before a person or object reaches it. The safety distance varies
according to the standards of each country and the individual specifications of each machine. Always
refer to relevant standards.
Make sure to secure the safety distance (S) between the F3SJ-E/B and the hazardous
part. Otherwise, the machine may not stop before a person reaches the hazardous part,
resulting in serious injury.
The response time of a machine is the time period from when the machine receives a stop signal to when the
machine's hazardous part stops. Measure the response time on the actual system. Also, periodically check to make
sure that the response time of the machine has not changed.
 How to calculate the safety distance specified by International Standard ISO 13855
(European Standard EN ISO 13855) (Reference)
If a person approaches the detection zone of the F3SJ-E/B perpendicularly
S = K x T + C . . . Formula (1)
•S: Safety distance
•K: Approach speed to the detection zone
•T: Total response time of the machine and F3SJ-E/B
•C: Additional distance calculated by the detection capability
of the F3SJ-E/B
<System that has detection capability of 30 mm or less>
Use K = 2,000 mm/s and C = 8 x (d - 14 mm) in formula (1)
for the calculation.
S = 2,000 mm/s x (Tm + Ts) + 8 x (d - 14 mm)
•S = Safety distance (mm)
•Tm = Machine's response time (s)
•Ts = Response time of the F3SJ-E/B from ON to OFF (s)
•d = Detection capability of the F3SJ-E/B (mm)
[Calculation example]
When Tm = 0.05 s, Ts = 0.015 s, and d = 25 mm:
S = 2,000 mm/s x (0.05 s + 0.015 s) + 8 x (25 mm - 14 mm)
= 218 mm
If the result is less than 100 mm, use S = 100 mm.
If the result exceeds 500 mm, use the following formula where K = 1,600 mm/s.
S = 1,600 mm/s x (Tm + Ts) + 8 x (d - 14 mm) . . . Formula (2)
If the result of this formula (2) is less than 500 mm, use S = 500 mm.
Wiring/Installation
Safety distance (S)
Hazard
F3SJ-E/B
User's Manual
E
39