Mounting
Leuze electronic
RSL 410
52
1
Physical frame for reference contour
2
Reference contour, must cover at least two sides of the protective field
3
Safety sensor
4
Distance e between the reference contour frame and machine opening, recommended: e = 150 mm
5
Machine opening contour
Figure 7.13: Defining the protective field contour and reference contour, stationary point of operation
guarding, vertical protective field
7.4
Stationary access guarding
The vertical protective field used for access guarding only detects people during passage through. After a
person has passed through, a start/restart interlock must ensure that the dangerous movement does not
start again automatically.
Calculation of safety distance S
RT
for access guarding
S
RT
[mm]
= Safety distance
K
[mm/s]
= Approach speed for access guarding with approach direction orthogonal to the protec
-
tive field: 2000 mm/s or 1600 mm/s, if S
RT
> 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, max. 80 ms
t
i
[s]
= Response time of the safety relay
t
m
[s]
= Machine stopping time
C
RT
[mm]
= Additional distance for access guarding with approach reaction with resolutions of
14 to 40 mm, d = resolution of protective device C
RT
= 8
(d - 14) mm. Additional dis
-
tance for access guarding for resolutions > 40 mm: C
RT
= 850 mm (standard value for
arm length)
Response times, stopping time of the machine
The safety sensor's rotary mirror rotates on its own axis every 40 ms. One revolution is a scan. With each
additional scan the response time t
a
increases by 40 ms. With K = 2000 mm/s approach speed this corre
-
sponds with an increase in the safety distance of 80 mm per additional scan. With K = 1600 mm/s it is
64 mm.
Select a response time t
a
of 80 ms or higher.
Never define a value higher than 80 ms for t
a
for access guarding or passage controls. With higher val
-
ues it can happen that a person might not be detected when passing through the protective field with
an approach speed of 1600 mm/s.
Determine the machine/system's stopping time t
m
.
If data is not available, you can commission Leuze electronic to perform measurements (see chapter 14
e
e
S
2
3
4
5
1
1
S
RT
K T C
RT
+
=