Multi-Beam Safety Light Array
39
Calculating the safety clearance for reaching over S
RO
If it is possible to reach over or under the safety field, the safety clearance S
RO
(safety clearance for access
over the safety field) must be calculated.
S
RO
= K × T + C
RO
S
RO
Safety clearance for access over the safety field
RO = Reach over
K
Approach speed with vertical safety field
K = 2000 mm/s
K = 1600 mm/s (if SRO > 500 mm)
T [s]
Total response time
T = (t
1
+ t
2
+ t
3
)
t
1
[s]
Response time of the ESPE
t
2
[s]
Response time of the safety switching device
t
3
[s]
Machine over-travel time
C
RO
Margin for access over the safety field status
Value in accordance with table from EN ISO 13855 (see below)
a
b
C
RO
S
RO
K×T
!
Figure 2: Relationship between C
RO
and S
RO
a [mm] = height of the danger zone
b [mm] = height of the top edge of the safety field
H [mm] = reference height, height of the safety field above ground
