Before Using this Device
SF4C Safety light curtain
18
NOTE
For details of the floating blanking function, see page 84.
2.4.2.1 Calculation Example for Europe
The equation for the safety distance S is calculated in accordance with EN 999 and ISO 13855.
Formula in case that the minimum sensing object is Ø40mm or less:
S = K x T + C
S:
Safety distance (mm)
Minimum distance required between the sensing area surface and the dangerous
parts of the machine.
K:
Intrusion velocity of operator's body or object (mm/s). The equation assumes an
intrusion direction perpendicular to the sensing area.
Response time of total equipment (s). T = T
m
+ T
SF4C
T
m
:
Maximum halt time of device (s). For determining T
m
, refer to the
machine documentation or take a measurement using a special device
called a 'brake monitor'.
T:
T
SF4C
:
Response time of this device (s)
Additional distance calculated from the minimum size of the object to be detected by
the sensor (mm). C has to be 0 or more. C = 8 x (d - 14)
C:
d:
Minimum object diameter (mm)
1.
2.
3.
Procedure
1. Calculate the safety distance S with a velocity K
=
2,000mm/s
There are 3 possibilities (1-3):
1. S < 100mm
Use 100mm as the safety distance.
2.100
≤
S
≤
500mm
Use the calculated result as the safety
distance.
3. S > 500mm
Continue with the next step in the procedure
2. Recalculate
S
with
K'
=
1,600mm/s
There are 2 possibilities (4-5):
4. S > 500mm
Use the calculated result as the safety distance.
5. S
≤
500mm
Use 500mm as the safety distance.
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