Panasonic SF4C Series Instruction Manual page 16

Protection Area
[For use in the United States of America (as per ANSI/RIA 15.06)]
● Equation 2
D : Safety distance (mm)
S
Minimum required distance between the sensing area surface and the dangerous parts of the
machine
K : Intrusion speed {Recommended value in OSHA is 63 (inch/sec.) [≈ 1,600 (mm/sec.)]}
ANSI/RIA 15.06 does not define the intrusion speed "K". When determining K, consider pos-
sible factors including physical ability of operators.
T : Halting time calculated from the operation time of the control element (air valve, etc.) (sec.)
S
T : Maximum response time of the control circuit required for functioning the brake (sec.)
C
T : Response time of this device (sec.)
SF4C
T : Additional halting time tolerance for the brake monitor (sec.)
bm
The following equation holds when the machine is equipped with a brake monitor.
T = T
bm
Ta: Setting time of brake monitor (sec.)
When the machine is not equipped with a brake monitor, it is recommended that 20% or more
of (T
S
D : Additional distance calculated from the size of the minimum sensing object of the device (mm)
pf
D = 61.2mm
pf
D = 3.4 × (d - 0.276) (inch)
pf
≈ 3.4 × (d - 7) (mm)
d: Minimum sensing object diameter 0.985 (inch) ≈ 25 (mm)
<Reference>
When the floating blanking function is applied, the minimum sensing object becomes large. According to ANSI/RIA
15.06, Dpf = 900mm (3ft) when d > 64mm (2.5 inches).
<Reference>
Since the calculation above is performed by taking 1 (inch) = 25.4 (mm), there is a slight difference between the representa-
tion in (mm) and that in (inch).
Refer to the relevant standard for the details.
<Calculation example>
● Calculation example 2: For use in the United States of America
[OFF response time: 7ms or less, minimum sensing object diameter: 0.985 (inch) ≈ 25 (mm)]
Ds = K × (T
S
= 63 × (T
= 63 × (T
= 63 × T
a
= 63 × T
a
= 63 × T
a
≈ 63 × T
a
In case this device is installed in a system with a maximum halting time 0.1 (sec.)
Ds = 63 × T
a
= 63 × 0.1 + 2.85
= 9.15 (inch)
≈ 232.41 (mm)
Hence, as per the calculations Ds is 232.4 (mm).
<Reference>
Since the calculation above is performed by taking 1 (inch) = 25.4 (mm), there is a slight difference between the repre-
sentation in (mm) and that in (inch).
Refer to the relevant standard for the details.
16
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D = K × (T + T
S S C
- (T + T )
a S C
+ T ) is taken as additional halting time.
C
+ T + T + T ) + D
C SF4C bm
+ 0.007) + 3.4 × (d - 0.276) (inch)
a
+ 0.007) + 3.4 × (0.985 - 0.276)
a
+ 63 × 0.007 + 3.4 × 0.709
+ 0.441 + 2.4106
+ 2.8516
+ 2.85 (inch)
+ 2.85
+ T + T ) + D
SF4C bm pf
pf
© Panasonic Industrial Devices SUNX Co., Ltd. 2016