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6
Mounting
WARNING
Improper mounting may result in serious injury!
The protective function of the safety sensor is only ensured if appropriately and professionally mounted
for the respective, intended area of application.
Only allow competent persons to install the safety sensor.
Maintain the necessary safety distances (see chapter 6.1.1).
Make sure that stepping behind, crawling under or stepping over the protective device is reliably ruled
out and reaching under, over or around is taken into account in the safety distance, if applicable with
additional distance C
Take measures to prevent that the safety sensor can be used to gain access to the danger zone, e.g.
by stepping or climbing into it.
Observe the relevant standards, regulations and these instructions.
Clean the transmitter and receiver at regular intervals: environmental conditions (see chapter 14), care
(see chapter 10).
After mounting, check the safety sensor for proper function.
6.1
Arrangement of transmitter and receiver
Optical protective devices can only perform their protective function if they are mounted with adequate
safety distance. When mounting, all delay times must be taken into account, such as the response times
of the safety sensor and control elements as well as the stopping time of the machine, among others.
The following standards specify calculation formulas:
• prEN IEC 61496-2, "Active Optoelectronic Protective Devices": distance of the reflecting surfaces/
deflecting mirrors
• EN 13855, "Safety of machines - The positioning of protective equipment in respect of approach
speeds of parts of the human body": mounting situation and safety distances
In accordance with ISO 13855, with a vertical protective field, it is possible to pass under beams
over 300 mm or pass over beams under 900 mm. If the protective field is horizontal, climbing on
the safety sensor must be prevented through suitable installation or with covers and the like.
6.1.1
Calculation of safety distance S
General formula for calculating the safety distance S of an optoelectronic protective device acc. to
EN ISO 13855:
S
K
T
t
a
t
i
t
m
C
If longer stopping times are determined during regular inspections, an appropriate additional time
must be added to t
Leuze electronic
corresponding to EN ISO 13855.
RO
S
K T
C
=
+
[mm]
= Safety distance
[mm/s]
= Approach speed
[s]
= Total time of the delay, sum from (t
[s]
= Response time of the protective device
[s]
= Response time of the safety relay
[s]
= Stopping time of the machine
[mm]
= Additional distance to the safety distance
.
m
+ t
+ t
)
a
i
m
MLC 520 EX
Mounting
19
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