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F3SJ-A
User’s Manual
Chapter
4
Ins
ta
llat
io
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Co
nditions
Wiring/Installation
E
Safety Distance
The safety distance is the distance that must be set between the F3SJ 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 the
relevant standards.
Make sure to secure the safety distance (S) between the F3SJ and the hazardous part.
Otherwise, the machine may not stop before a person reaches the hazardous part, result-
ing 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 that the response time
of the machine has not changed.
How to calculate the safety distance specified by International Standard ISO 13855-
2002 (European standard EN999) (Reference)
If a person approaches the detection zone of the F3SJ 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
• C: Additional distance calculated by the detection capability
of the F3SJ
<System that has detection capability of 40mm or less>
Use K = 2,000mm/s and C = 8 x (d - 14mm) in formula (1)
for the calculation.
S = 2,000mm/s x (Tm + Ts) + 8 x (d - 14mm)
•S = Safety distance (mm)
•Tm = Machine's response time (s)
•Ts = Response time of the F3SJ from ON to OFF (s)
•d = Detection capability of the F3SJ (mm)
[Calculation example]
When Tm = 0.05s, Ts = 0.01s, and d = 14mm:
S=2,000mm/s x (0.05s + 0.01s) + 8 x (14mm - 14mm)
= 120mm . . . Formula (2)
If the result
<
100mm, use S = 100mm.
If the result exceeds 500mm, use the following expression where K = 1,600mm/s.
S=1,600mm/s x (Tm + Ts) + 8 x (d - 14mm) . . . Formula (3)
If the result of this formula (3)
<
500mm, use S = 500mm.
<A system with larger detection capability than 40mm>
Calculate by using Equation (1) with K = 1,600mm/s and C = 850mm:
S = 1,600mm/s x (Tm + Ts) + 850 . . . Equation (4)
•S = Safety distance (mm)
Hazard
Safety distance (S)
Summary of Contents for F3SJ Series
Page 1: ...F3SJ A N Series Version 2 Safety Light Curtain User s Manual Cat No SCHG 719K...
Page 19: ...xvii F3SJ A User s Manual Introduction Contents E Revision History 202...
Page 20: ...xviii Introduction Contents F3SJ A User s Manual...
Page 184: ...164 Chapter 4 Wiring F3SJ A User s Manual Wiring Installation...
Page 192: ...172 Chapter 5 Wiring Examples F3SJ A User s Manual Input Output Circuit and Applications...