Before Using this Device
SF4C Safety light curtain
20
= 1,600 x (0.4 + 0.007) + 8 x (25 - 14)
= 739.2
As 739.2 is > 500mm, use this recalculated result as the safety distance.
Formula in case that the minimum sensing object is Ø40mm or more:
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)
C:
Additional distance calculated from the minimum size of the object to be detected by
the sensor (mm). C = 850 mm (Constant)
2.4.2.2 Calculation Example for US
he equation safety distance S is calculated in accordance with ANSI/RIA B15.06 with the
formula:
S = K x (T
s
+ T
c
+ T
SF4C
+ T
bm
) + D
pf
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. The recommended value in OSHA is
63inch/s
≈
1,600mm/s.
ANSI/RIA B15.06 does not define the intrusion velocity 'K'. When determining K,
consider possible factors including the physical ability of operators.
Additional halting time tolerance for the brake monitor (s)
T
bm
= T
a
- (T
s
+ T
c
)
T
a
:
Setting time of brake monitor (s)
When the machine is not equipped with a brake monitor, it is
recommended that 20% or more of (T
s
+ T
c
) is taken as additional halt
time.
T
bm
T
s
:
Halt time calculated from the operation time of the control element (air
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