Panasonic ST4 Instruction Manual
2.3 Protection Area
17
2.3.2.1 Calculation Example for Europe
The minimum safety distance S is calculated in accordance with EN 999 and ISO 13855 with
the following equation:
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. The recommended value is
1600 mm/s.
Response time of total equipment (s). T = T
m
+ T
ST4
T
m
:
Maximum halt time of the machine (s). To determine T
m
, refer to the
machine documentation or take a measurement using a special device
called a "brake monitor".
T:
T
ST4
:
Response time of the safety beam sensor (s).
C:
Additional distance (mm).
Depending on the height of the beam axis EN 999 recommends different additional
distances as shown in the following table.
Number of beam
axes
1
2
3
4
750 mm
400mm
300mm
300mm
900mm 700mm 600mm
1100mm 900mm
Height of beam axis
(e.g. height from the
floor)
1200mm
Additional distance
1200mm
850mm
850mm
850mm
EXAMPLE
Calculation of the safety distance (S) with the following values and four units of the
ST4-A
□
installed.
K: 1600mm/s
T
m
: 0.1s
T
ST4
: 0.025s
C: 850mm
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