© Panasonic Industrial Devices SUNX Co., Ltd. 2013 MJE-SF4A No.0038-55V
- 39 -
[For use in the United States of America (as per ANSI B11.19)]
Equation 2
S = K × (T
s
+ T
c
+ T
SF4
+ T
bm
) + Dpf
S :
Safety
distance
(mm)
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/s) [
≈
1,600 (mm/s)] }
ANSI B11.19 does not define the intrusion speed ‘K’. When determining K,
consider possible factors including physical ability of operators.
T
s
: Halting time calculated from the operation time of the control element (air valve,
etc.) (s)
T
c
: Maximum response time of the control circuit required for functioning the brake (s)
T
SF4
: Response time of this device (s)
T
bm
: Additional halting time tolerance for the brake monitor (s)
The following equation holds when the machine is equipped with a brake monitor.
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 halting time.
Dpf : Additional distance calculated from the size of the minimum sensing of the
sensor (mm)
Dpf = 78.2mm
<Reference>
When using the floating blanking function, the size of the minimum sensing object becomes larger.
According to ANSI B11.1, in case d > 64mm (2.5 inches), Dpf = 900mm (3ft).
<Reference>
Since the calculation above is performed by taking 1 (inch) = 25.4 (mm), there is a slight difference
between the representation 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: 11ms or less, minimum sensing object diameter: 1.2 inch
≈
30 (mm)]
S = K × (T
s
+ T
c
+ T
SF4
+
T
bm
) + Dpf
=
63
×
(T
a
+ 0.011) + 3.4 × (d - 0.276) (inch)
=
63
×
(T
a
+ 0.011) + 3.4 × (1.2 - 0.276)
=
63
×
T
a
+ 63 × 0.011 + 3.4 × 0.924
=
63
×
T
a
+ 3.8346
≈
63 × T
a
+ 3.84 (inch)
In case this device is installed in a system with a maximum halting time 0.1 (s)
S = 63 × T
a
+ 3.84
= 63 × 0.1 + 3.84
=
10.14
(inch)
≈
257.6 (mm)
Hence, as per the calculations S is 257.6 (mm).
<Reference>
Since the calculation above is performed by taking 1 (inch) = 25.4 (mm), there is a slight difference
between the representation in (mm) and that in (inch). Refer to the relevant standard for the details.
Dpf = 3.4 × (d - 0.276) (inch)
≈
3.4 × (d - 7) (mm)
d: Minimum sensing object diameter
Note that the value of Dpf cannot be 0 or less.
Summary of Contents for SF4-AH Series
Page 1: ... Panasonic Industrial Devices SUNX Co Ltd 2013 MJE SF4A No 0038 55V 1 ...
Page 2: ... Panasonic Industrial Devices SUNX Co Ltd 2013 MJE SF4A No 0038 55V 2 MEMO ...
Page 14: ...Common specifications Panasonic Industrial Devices SUNX Co Ltd 2013 MJE SF4A No 0038 55V 14 ...
Page 17: ...SF4 AH H Panasonic Industrial Devices SUNX Co Ltd 2013 MJE SF4A No 0038 55V 17 ...
Page 19: ...SF4 AH H Panasonic Industrial Devices SUNX Co Ltd 2013 MJE SF4A No 0038 55V 19 ...
Page 21: ...SF4 AH H Panasonic Industrial Devices SUNX Co Ltd 2013 MJE SF4A No 0038 55V 21 ...
Page 23: ...SF4 AH H Panasonic Industrial Devices SUNX Co Ltd 2013 MJE SF4A No 0038 55V 23 ...
Page 78: ... Panasonic Industrial Devices SUNX Co Ltd 2013 MJE SF4A No 0038 55V 78 MEMO ...
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