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Before Using this Device
Panasonic ST4 Instruction Manual
16
Top view
From the top view the safety distance between the sensing area and the dangerous part is
clearly visible.
ST4-A
□
ST4-A
□
Receiver of the
Emitter of the
Safety distance S (Ds)
Dangerous
part
2.3.2 Safety
Distance
!
DANGER!
Calculate the safety distance correctly, and always
maintain a distance 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
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 the
ST4-A
□
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 (see page 17) when a person moves
perpendicular to the sensing area of the area sensor.
CAUTION
•
Before designing the system, refer to the relevant standards of the region
where the single beam sensor is to be used.
•
The equation should only be used when the intrusion direction is
perpendicular to the sensing area. If 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 when the machine
receives the halt signal from this device to the point when the dangerous
part of the machine stops. The max. response time of the machine should be
timed with the machine actually used.
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