Safety Distance - Panasonic SF4B-F31G(V2) Instruction Manual

2-3-2 Safety Distance

The safety distance is the minimum distance that must be maintained between the device and
the dangerous parts of the machine so that the machine can be stopped before a human body
or an object can reach the dangerous parts.
The safety distance is calculated based on the equation described in the next page when a per-
son moves perpendicular (normal intrusion) to the sensing area of the device.
Dangerous
part
© Panasonic Industrial Devices SUNX Co., Ltd. 2017
Calculate the safety distance correctly, and always maintain the distance which
is equal to or greater than the safety distance, between the sensing area of this
device and the dangerous parts of the machine. If the safety distance is miscal-
culated or if sufficient distance is not maintained, the machine will not stop quickly
before reaching to the dangerous parts, which can result in death or serious injury.
Before designing the system, refer to the relevant standards of the region where
this device is to be used, and then install this device.
Furthermore, the equation described in the next pages is to be used only in case
the intrusion direction is perpendicular to the sensing area. In case the intrusion
direction is not perpendicular to the sensing area, be sure to refer to the relevant
standard (regional standard, specification of the machine, etc.) for details of the
calculation.
The max. response time of the machine is from the point that the machine re-
ceives the halt signal from this device to the point that the dangerous parts of the
machine stops. The max. response time of the machine should be timed with the
machine to be actually used.
The size of the minimum sensing object for this device varies depending on the
case whether the floating blanking function is applied or not. Calculate the safety
distance with the proper size of the minimum sensing object and appropriate
equation.
<Size of minimum sensing object when applying floating blanking function>
SF4B-F□G<V2>
(10mm-beam channel pitch type)
SF4B-H□G<V2>
(20mm-beam channel pitch type)
SF4B-A□G<V2>
(40mm-beam channel pitch type)
Note: Refer to "3-9 Functions Using Handy Controller (SFB-HC) (Optional)" for details of
the floating blanking function.
Safety distance S
Floating blanking function
Invalid
1 beam
channel
ø14mm ø24mm
ø25mm ø45mm
ø45mm ø85mm
Sensing area
Intrusion direction
Setting (Note)
2 beam
channels
ø34mm
ø65mm
ø125mm ø165mm
3 beam
channels
ø44mm
ø85mm
15