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F3SG-SR/PG
User’s Manual
Wiring and Installation
5-1-2. Safety Distance
The safety distance is the distance that must be set between the F3SG-SR/PG 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 install the F3SG-SR/PG at the safety distance from the hazardous part of
the machine. Otherwise, the machine may not stop before a person reaches the hazard-
ous 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 that the response time
of the machine has not changed.
5-1-2-1. Safety Distance Formulas according to ISO 13855/EN ISO 13855
Detection Zone Orthogonal to Direction of Approach
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 the F3SG-SR/PG
• C: Additional distance calculated by the detection capability
(or object resolution) of the F3SG-SR/PG
Calculation Example for Systems with a Detection
Capability or a Beam Gap of 40 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 F3SG-SR from ON to OFF (s)
• d = Detection capability (or object resolution) of the F3SG-SR (mm)
[Calculation example]
When Tm = 0.05 s, Ts = 0.008 s, and d = 14 mm:
S=2,000 mm/s x (0.05 s + 0.008 s) + 8 x (14 mm - 14 mm)
= 116 mm . . . Formula (2)
If the result
<
100 mm, use S = 100 mm.
If the result exceeds 500 mm, use the following expression where K = 1,600 mm/s.
S=1,600 mm/s x (Tm + Ts) + 8 x (d - 14 mm) . . . Formula (3)
If the result of this formula (3)
<
500 mm, use S = 500 mm.
Hazard
Safety distance (S)
Summary of Contents for F3SG-PG Series
Page 18: ...xvi Introduction F3SG SR PG User s Manual...
Page 30: ...xxviii Introduction F3SG SR PG User s Manual...
Page 74: ...44 Chapter 1 List of Models F3SG SR PG User s Manual Overview and Specifications...
Page 180: ...150 Chapter 2 IO Link F3SG SR PG User s Manual System Operation and Functions...
Page 438: ...408 Chapter 7 Maintenance Checklists F3SG SR PG User s Manual Checklists...
