Before Using this Device
Panasonic ST4 Instruction Manual
18
S
= K x T + C
= 1600 × (T
m
+ T
ST4
) + 850
= 1600 × (0.1s + 0.025s) + 850
= 1600 × 0.1s
+ 1600 × 0.025 + 850
= 160 + 40 + 850
= 1050
Hence, as per the calculations S is 1050mm.
2.3.2.2 Calculation Example for the US
The safety distance D
s
is calculated in accordance with ANSI/RIA 15.06 with the equation:
D
s
= K × T + D
pf
D
s:
Safety distance (mm)
Minimum required distance 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 (
≈
1600mm/s).
ANSI/RIA 15.06 does not define the intrusion velocity "K." When determining K,
consider possible factors including the physical ability of the operators.
T:
Response time of total equipment (s). T = Ts + Tc + T
ST4
T
s
is the worst stopping time of the machine/equipment
T
c
is the worst stopping time of the control system
T
ST4
is the response time of the safeguarding device (25ms)
D
pf
:
Additional distance calculated from the size of the minimum sensing object of the
sensor (mm).
REFERENCE
Since the calculation is based on 1 inch = 25.4mm, there is a slight difference
between the representation in mm and that in inches. Refer to the relevant
standard for the details.
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