Detection Zone And Intrusion Path; Distances From Reflective Surfaces; Safety Distance - Omron F3SH-A Datasheet

Detection zone and intrusion path

F3SN-A Safety Light Curtain
Install protective structures around the machine so that you must
pass through the detection zone of the F3SN-A to reach a hazardous
part of the machine.
Install the F3SN-A so that some part of the operator's body remains
in the detection zone at all times when the operator works in a haz-
ardous area. Failure to do so may result in serious injury.
Correct Installation
A hazardous part of a machine
can be reached only by passing
through the sensor detection
zone.
Incorrect Installation
A hazardous part of a machine
can be reached without passing
through the sensor detection
zone.
F3SH-A Multi-beam Safety Sensor
Install protective structures around the machine so that you must
pass through the detection zone of the F3SH-A to reach a hazardous
part of the machine.
If it is possible for an operator to get between the sensor's detection
zone and the hazardous part of the machine, design the system so
that machinery cannot start up automatically. Make sure that machin-
ery cannot restart while the operator is in the hazardous area. Posi-
tion the switch for restarting machinery in a location from which the
status of the hazardous area can be seen clearly. The switch position
location must be a place where the switch cannot be operated from
within the hazardous area.
Failure to do so may result in serious injury.
Use of the fixed blanking function
After setting the fixed blanking, check that the F3SN-A detects a test
rod at any position in the detection zone through which a person can
reach the hazardous part of the machine. If any positions are found
by check above, install protective structures to prevent intrusion,
which the F3SN-A can not detect.
Failure to do so may result in serious injury.
G-18
Some part of the operator's
body remains in the detection
zone while they are working.
A worker is between the sensor
detection zone and a
hazardous part of a machine.

Distances from reflective surfaces

Be sure to install the F3SN-A/F3SH-A to minimize the effects of re-
flection from nearby surfaces.
Failure to do so may cause detection to fail and may result in serious
injury.
Side View
Reflecting ceiling
D
Emitter Receiver
Detection zone
L
D
Reflecting floor
Install the F3SN-A/F3SH-A with minimum Distance D shown above
from reflective surfaces (highly reflective surfaces) such as metal
walls, floors, ceilings, and work pieces.
Distance between Minimum installation distance D
emitter and receiver
(Operating range L)
0. 2 to 3 m 0.13 m
over 3 m L/2 × tan 2.5° = L × 0.044 (m)

Safety distance

Always maintain a safe distance (S) between the light curtain and a
hazardous part of a machine.
Failure to do so causes the machine to fail to stop before an operator
reaches the dangerous area and may result in serious injury.
Use of the floating blanking increases the size of the detection capa-
bility. To calculate a safety distance, be sure to use the increased size
of the detection capability.
Failure to do so causes the machine to fail to stop before an operator
reaches the dangerous area and may result in serious injury.
The "safety distance" is the minimum distance that must be main-
tained between the F3SN-A/F3SH-A and a hazardous part of a ma-
chine in order to stop the machine before someone or something
reaches it. The safety distance is calculated based on the following
equation when a person moves perpendicular to the detection zone
of a light curtain.
Safety distance (S) = Intrusion speed into the detection zone (K)
× Total response time for the machine and light curtain (T)
+ Additional distance calculated based on the detection
capability of the light curtain (C) .......................................... (1)
The safety distance varies with national standards and individual ma-
chine standards. The equation is also different if the direction of in-
trusion is not perpendicular to the detection zone of the light curtain.
Be sure to refer to related standards.
F3SN-A Safety Light Curtain
Reference
Method for calculating safety distance as provided by European Norm
EN999 (for intrusion perpendicular to the detection zone)
Detection capaibility: 40mm or less
Substitute K = 2000 mm/s and C = 8 (d – 14 mm) in equation (1)
and calculate as shown below.
S = 2000 mm/s × (Tm + Ts) + 8 (d – 14 mm) ......................... (2)
Where: S = Safety distance (mm)
Tm = Machine response time (s) (See note 1)
Ts = Light curtain response time (s) (See note 2)
Safety Sensors / Components
Top View
Reflecting surface
D
Emitter Receiver
θ θ
L
θ= 5˚ (F3SN-A/ F3SH-A)
θ= 10˚ (F3SN-B)
F3SN-A/ F3SH-A