Mounting
Leuze electronic GmbH + Co. KG
ELC 100
17
Calculation of safety distance S
Ro
acc. to ISO/EN ISO 13855 when protective field is accessed from
above:
Calculation of safety distance S
Ro
for point of operation guarding
S
RO
[mm]
=
Safety distance
K
[mm/s]
=
Approach speed for point of operation guarding with approach reaction and normal approach di-
rection to the protective field (resolution 14 to 40 mm): 2000 mm/s or 1600 mm/s, when
S
RO
> 500 mm
T
[s]
=
Total time of the delay, sum from (t
a
+ t
i
+ t
m
)
t
a
[s]
=
Response time of the protective device
t
i
[s]
=
Response time of the safety relay
t
m
[s]
=
Stopping time of the machine
C
RO
[mm]
=
Additional distance in which a body part can move towards the protective device before the pro-
tective device triggers: value (see the following table “Reaching over the vertical protective field
of electro-sensitive protective equipment (excerpt from ISO/EN ISO 13855)”).
a
3
C
RO
KxT
b
1
2
S
RO
1
Safety sensor
2
Danger zone
3
Floor
a
Height of the point of operation
b
Height of the upper beam of the safety sensor
Fig. 5.1:
Additional distance to the safety distance in the case of reaching over
