Installation - Omron F3SH-A Datasheet

K = Intrusion speed: 1600 mm/s min.
Ts = Maximum stop time of machine/equipment (s)
Tc = Maximum stop time of control system (s)
Tr = Light curtain response time (s)
Os = Diameter of the smallest detectable object (mm)
Dpf = Additional distance (mm)
Assume that the sensor is installed with the lowest beam height
above the floor at 300 mm and the highest beam height above
the floor at 1200 mm, with the diameter of the smallest detect-
able object being 64 mm or less. Then, Dpf is determined from:
Dpf = 3.4 × (Os – 6.875 mm).
If the diameter of the smallest detectable object is more than 64
mm, Dpf is calculated to be 900 mm.
e. g.:
@@@@
• F3SN-A P40 Safety Light Curtain
Assume that K = 1600 mm/s, Ts + Tc = 0.06 s, Tr = 0.01 s,
and Os = 40 mm.
Then:
S = 1600 × (0.06 + 0.01) + Dpf
= 1600 × (0.06 + 0.01) + 3. 4 (40 – 6.875)
= 225 mm
@@@@
• F3SN-A P70 Safety Light Curtain
Assume that K = 1600 mm/s, Ts + Tc = 0.06 s, Tr = 0.01 s,
and Dpf = 900 mm.
Then:
S = 1600 × (0.06 + 0.01) + 900
= 1012 mm
Note: The light curtain response time refers to the time required for output to
change from ON to OFF.
F3SH-A Multi-beam Safety Sensor
Reference
Method for calculating safety distance as provided by European Norm
EN999 (for intrusion perpendicular to the detection zone)
Substitute K = 1600 mm/s and C = 850 mm in equation (1) and calcu-
late as shown below.
S = 1600 mm/s × (Tm + Ts) + 850
Where:
S = Safety distance (mm)
Tm = Machine response time (s) (See note 1)
Ts = Sensor response time (s) (See note 2)
e. g.:
Tm = 0.05 s, Ts = 0.01 s:
S = 1600 mm/s × (0.05 s + 0.01 s) + 850 mm = 946 mm
Note: 1 . The machine response time refers to the maximum time from the mo-
ment the machine receives a stop signal to the moment the hazardous
part of the machine stops. The machine response time should be
measured on actual machines. The machine response time should be
measured and confirmed periodically.
2 . The sensor response time refers to the time required for output to
change from ON to OFF.
G-20

Installation

How to prevent mutual interference
The emitter and the receiver to be set facing each other should be a
pair of the same set. Erroneous combination may create a zone
where objects cannot be detected.
Do not use the sensors for a system where the beam is reflected, or
object detection may be disabled. In such an application, use a beam
path diversion mirror to prevent the beam reflected from an object
from entering the receiver.
When installing two or more pairs of the F3SN-A/F3SN-B/F3SH-A,
take necessary measures to prevent mutual interference. Examples
of such measures include electrical interconnection and the use of
baffle plates.
Safety Sensors / Components