Panasonic SF4B-F31G(V2) Instruction Manual page 18

[For use in the United States of America (as per ANSI B11.19)]
● Equation 2
Ds
: Safety distance (mm)
Minimum required distance between the sensing area surface and the danger-
ous parts of the machine
K : Intrusion speed {Recommended value in OSHA is 63 (inch/sec.) [≈ 1,600 (mm/sec.)] }
ANSI B11.19 does not define the intrusion speed "K". When determining K, con-
sider possible factors including physical ability of operators.
Ts : Halting time calculated from the operation time of the control element (air valve, etc.) (sec.)
Tc : Maximum response time of the control circuit required for functioning the brake (sec.)
T : Response time of this device (sec.)
SF4B
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
When the machine is not equipped with a brake monitor, it is recommended that
20% or more of (Ts + Tc) is taken as additional halting time.
D
: Additional distance calculated from the size of the minimum sensing object of
pf
the device (mm)
SF4B-F□G<V2> Dpf = 23.8mm
SF4B-H□G<V2> Dpf = 61.2mm
SF4B-A□G<V2> Dpf = 129.2mm
Dpf = 3.4 × (d - 0.276) (inch)
d: Minimum sensing object diameter 0.552 (inch) ≈ 14 (mm) SF4B-F□G<V2>
<Reference>
When the floating blanking function is applied, the minimum sensing object becomes large. According to
ANSI B11.1, 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 be-
tween 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: 14ms or less, minimum sensing object diameter: 0.552 (inch) ≈ 14 (mm)]
Ds = K × (Ts + Tc + T
= 63 × (Ta + 0.014) + 3.4 × (d - 0.276) (inch)
= 63 × (Ta + 0.014) + 3.4 × (0.552 - 0.276)
= 63 × Ta + 63 x 0.014 + 3.4 × 0.276
= 63 × Ta + 1.8204
≈ 63 × Ta + 1.82 (inch)
In case this device is installed in a system with a maximum halting time 0.1 (sec.)
Ds = 63 × Ta + 1.82
= 63 × 0.1 + 1.82
= 8.12 (inch)
≈ 206.248 (mm)
Hence, as per the calculations
<Reference>
Since the calculation above is performed by taking 1 (inch) = 25.4 (mm), there is a slight difference be-
tween the representation in (mm) and that in (inch). Refer to the relevant standard for the details.
18
Ds = K × (Ts + Tc + T
= Ta - (Ts + Tc)
bm
: Setting time of brake monitor (sec.)
a
≈ 3.4 × (d - 7) (mm)
Minimum sensing object diameter 0.985 (inch) ≈ 25 (mm) SF4B-H□G<V2>
Minimum sensing object diameter 1.772 (inch) ≈ 45 (mm) SF4B-A□G<V2>
+
SF4B
SF4B
T
) + D
bm pf
D s is 206.2 (mm).
© Panasonic Industrial Devices SUNX Co., Ltd. 2017
+ T ) + D
bm pf