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.
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.
Supplement Z
R
for reflection-based measurement errors
All devices: If there is a retroreflector in the vicinity of the protective device (distance
of the retroreflector from protective field ≤ 6 m), you must take the supplement Z
R
=
350 mm into account.
If you use collision protection fields and a reference target is close to the protective field
(distance ≤ 6 m), you must always take supplement Z
R
into account.
Supplement Z
F
for lack of ground clearance
This supplement is necessary, because, generally, a person is detected above the foot
and so 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.
F
Z
L
S
F
B
Figure 34: flat-rate supplement ZF 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 flat-rate supplement for a ground clearance below 120
mm is 150
mm. This
supplement may be reduced further in individual cases. Read the supplement actually
required for your vehicle’s ground clearance from the following graph.
4
PROJECT PLANNING
48
O P E R A T I N G I N S T R U C T I O N S | microScan3 – PROFINET
8021219/1ELL/2022-01-21 | SICK
Subject to change without notice
