Mounting; Arrangement Of Transmitter And Receiver; Calculation Of Safety Distance S - Wieland SLC Series Operating Instructions Manual

6 Mounting

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.
Ä Only allow the safety sensor to be installed by qualified persons (see chapter 2.2 "Neces-
WARNING
sary competencies").
Ä Maintain the necessary safety distances (see chapter 6.1.1 "Calculation of safety dis-
tance S").
Ä 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
Ä 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.
Ä Observe the relevant standards, regulations and these instructions.
Ä Clean the transmitter and receiver at regular intervals: environmental conditions (see
chapter 14 "Technical data"), care (see chapter 10 "Maintenance").
Ä 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:
• IEC 61496-2, "Active optoelectronic protective devices": distance of the reflecting sur-
faces/deflecting mirrors
• EN 13855, "Safety of machines - The positioning of protective equipment in respect of ap-
proach speeds of parts of the human body": mounting situation and safety distances
NOTICE 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 [mm]
K [mm/s] = Approach speed
T [s]
t [s]
a
t [s]
i
t [s]
m
C [mm]
NOTICE If longer stopping times are determined during regular inspections, an appropriate additional
time must be added to t
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A)
= Safety distance
= Total time of the delay, sum from (t
= Response time of the protective device
= Response time of the safety relay
= Stopping time of the machine
= Additional distance to the safety distance
.
m
Mounting
corresponding to EN ISO 13855.
RO
+ t + t )
a i m
20