Leuze electronic RSL 420P - Stationary Guarding Calculations

Mounting
Leuze electronic GmbH + Co. KG RSL 420P 57
Ä Install the safety sensors with crossed alignment.
11
1 Scan level
Fig.7.11: Mounting beside one another, without height offset, crossed alignment
11
1 Scan level
Fig.7.12: Mutually opposing mounting, without height offset, crossed alignment
7.2 Stationary danger zone guarding
The safety sensor takes over the stop-activating and presence-detecting function.
Calculation of safety distanceS for parallel approach to the protective field
S
RO
[mm] = Safety distance
K [mm/s] = Approach speed for danger zone guarding with approach direction parallel to the protective
field (resolution up to 90mm): 1600mm/s
T [s] = Total time of the delay, sum from (t
a
+t
i
+t
m
+t
PS
)
t
a
[s] = Response time of the protective device
t
i
[s] = Response time of the safety control
t
m
[s] = Stopping time of the machine
t
PS
[s] = PROFIsafe watchdog time
C [mm] Additional distance for danger zone guarding with approach reaction
H=height of the protective field, H
min
=minimum installation height permitted, but no smaller
than0, d=resolution of the protective device C=1200mm-0.4×H; H
min
=15×(d-50)
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. At least two
consecutive scans must be interrupted so that the safety-related switching outputs switch off. The safety
sensor's minimum response time is therefore 80ms.
If you want to increase the safety sensor's availability in an environment with fine particles, increase the
number of interrupted scans after which the safety-related switching outputs switch off. With each addi-
tional scan the response time t
a
increases by 40ms. With K=1600mm/s the safety distance increases by
64mm per additional scan.
Ä Select a response timet
a
of at least 120ms or higher.
Ä Determine the machine/system's stopping timet
m
.
If data is not available, you can commission Leuze to perform measurements; see chapter 15 "Service
and support".
Ä If an increase in the stopping time within the regular test periods is to be expected, take an additional
time into account for the machine's stopping timet
m
.