Safety Distance - Omron F3SJ-A P Series User Manual

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. In addition, the
calculation of the safety distance differs if the direction of approach is not vertical to the detection zone
of the F3SJ. 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, 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.
How to calculate the safety distance specified by European standard EN999
(reference)
If a person approaches the detection zone of the F3SJ perpendicularly, calculate the safety distance as
shown below.
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]
AUDIN - 8, avenue de la malle - 51370 Saint Brice Courcelles
Tel : 03.26.04.20.21 - Fax : 03.26.04.28.20 - Web : http: www.audin.fr - Email : info@audin.fr
When Tm = 0.05s, Ts = 0.01s, and d = 14mm:
S=2,000mm/s x (0.05s + 0.01s) + 8 x (14mm - 14mm)
Safety distance (S)
Beam center-line mark
Hazardous area
Direction of approach
Detection zone
Wiring/Installation
F3SJ-A
User's Manual
E
49