Fotoelektrik Pauly – Light barriers
E_52692 Ref. 2019-29
14/24
Fotoelektrik Pauly GmbH, Wahrbrink 6, D-59368 Werne, T: +49 2389/402 27-70, F: +49 2389/402 27-77
http://www.fotoelektrik-pauly.de, eMail: info@fotoelektrik-pauly.de
4.4.3 Pollution Indicator
– meaning of the different circuit states
Table: 4.4.3
D
ri
ve
ac
ti
on
S
pe
cif
ic
s
ign
al
lev
el
ex
terna
l
tes
t
un
it
S
pe
cif
ic
s
ign
al
lev
el
ref
lec
to
r
view
P
re
-sw
it
ch
ing
sa
fety
-rel
a
ted
rel
ay
,
c
ircui
t
s
tate
M
ain
-sw
it
ch
ing
sa
fety
-rel
a
ted
rel
ay
,
c
ircui
t
s
tate
VK
-rel
ay
cir
cu
it
stat
e
M
ea
ning
D
istanc
e
trave
l
w
it
ho
ut
ref
lec
tor
vie
w
Higher than
V-level
-
on
on
off
No pollution on LB
Less than
V-level, but
higher than
switch-off level
-
on
on
on
Pollution on LB
– Prompt
cleaning of light barrier and
reflector required!
Less than
switch-off level
-
off
off
on
Severe pollution on LB with
transition into the secure status
(stopping of the travel movement)
– Immediate cleaning of light
barrier and reflector required!
A
pp
roac
h t
rav
el
w
it
h
ref
lec
tor
vie
w
-
Higher
than
V-level
off
on
off
No pollution on the reflector
-
Less
than
V-level
off
on
on
Pollution on the reflector OR
incomplete reflector view in the
pre-switching mode
-
off
off
on
Pollution on the reflector OR
incomplete reflector view in the
main switch-off mode
Legend / Explanations
V-level
Pollution warning level (default setting by manufacturer)
LB
Light barrier
Pollution on the
reflector
The Pollutants on the reflector has to be assumed if the limit distance has
been reached and the corresponding safety-related relays switched off, AND
after switching off the safety-related relays a sufficiently large distance has
been driven which should generates a larger reflector signal level than the
specific V-level itself.
Incomplete
reflector view
A permanently very small reflector view with signal level less than V-level
BUT signal level high enough to stop the travel movement.
Pollution Control
signal
The pollution warning signal is displayed with a relay (VK). The relay is
switched on with a delay of approx. 3s up to 5s if the current signal level
does not exceed the specific V-level during this period.
The pollution warning signal is reset immediately if the current signal level
exceeds the V-level again.
