Safety Distance - Panasonic SF4C Series Instruction Manual

2-3-2 Safety Distance

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 ma-
chine. If the safety distance is miscalculated 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.
The safety distance is the minimum distance that must be maintained between this device and the danger-
ous 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 person moves
perpendicular (normal intrusion) to the sensing area of the device.
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 receives 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 is depending on 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>
SF4C-F□
(10mm-beam channel pitch type)
SF4C-H□
(20mm-beam channel pitch type)
Note: For details of the floating blanking function, refer to "3-10 Functions Using Handy Controller SFC-HC
(option)."
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Safety distance S
Dangerous
part
Invalid
ø14mm
ø25mm
Sensing area
Intrusion direction
Floating blanking function
Setting (Note)
1 beam channel 2 beam channels
ø24mm ø34mm
ø45mm ø65mm
Protection Area
3 beam channels
ø44mm
ø85mm
13