NOTE
•
In a mobile application, a resolution of 70
mm (leg detection) is sufficient for
detecting people. This also applies to low mounting heights, since the safe multi‐
beam scanner moves together with the vehicle.
•
In the following calculation examples, only the vehicle speed is taken into account,
not the speed of a walking person. This is based on the assumption that the
person recognizes the danger and stands still.
4.3.6.1
The protective field must be sufficiently large so that a person located at the minimum
distance from the vehicle can be recognized. The minimum distance allows the vehicle
to stop in time before it reaches a person or an object.
In mobile hazardous area protection, the minimum distance typically defines the pro‐
tective field length required. When calculating the protective field length, the impact of
turning must be considered separately.
The protective field must be wide enough to cover the width of the loaded vehicle with
supplements for measurement error and the lack of ground clearance. When calculat‐
ing the protective field width, the impact of turning must be considered separately.
If you define a number of monitoring cases with different protective fields, you must
calculate the protective field size separately for each protective field used.
4.3.6.2
Supplement Z
F
for lack of ground clearance
This supplement is necessary, because, generally, a person is detected above the foot
and the braking process cannot take account of the length of the foot in front of the
point of detection. A person’s foot could be injured if a vehicle has no ground clearance.
Z
F
B
F
S
L
Figure 12: Flat-rate supplement for lack of ground clearance
B
F
Ground clearance
S
L
Protective field length without a supplement for lack of ground clearance
Z
F
Supplement for lack of ground clearance
The lump supplement for ground clearance under 120 mm is 150 mm. This supple‐
ment may be reduced further in individual cases,
PROJECT PLANNING
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8025936/2021-01-08 | SICK
O P E R A T I N G I N S T R U C T I O N S | scanGrid2 I/O
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Subject to change without notice
