SICK WEU 26/2 Stücklistenhandbuch
TECHNICAL DESCRIPTION
‡ EASY INSTALLATION †
‡ UNIVERSAL USABILITY†
‡ SOLID CONSTRUCTION †
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
2
SICK WSU 26/2 – WEU 26/2
8 008 692/9-12-99 T chnical D scription · WSU/WEU 26-2 © SICK AG · Saf ty Syst ms · G rmany · All rights r s rv d
Contents
G n rally r cogniz d t chnical
r gulations and quality assuranc
syst m ISO 9000 ar car fully
appli d during th d v lopm nt
and production of SICK
products.
Warning
Failur to obs rv
may r sult in
dang rous op ration
Usage
Information r garding
how to us th
product corr ctly
and ffici ntly
Standards and
Regulations
To b obs rv d in us
and installation
1 G n ral Introduction 3
2 D vic /Syst m
Construction 4
3 D scription of Function 4
4
Possibl Ar as of Application
and Application Conditions
5
4.1 Possibl Ar as
of Application 5
4.2 Application Conditions 5
5 M chanical Arrang m nt
and Mounting 6
5.1 Saf ty Distanc 6
5.2 M chanical Mounting 7
5.3 Multipl Saf guarding 8
5.3.1 Mutual Int rf r nc 8
5.4 Corn r Mirrors 10
6 Mounting 11
6.1 Mounting R quir m nts 11
6.2 D t cting R fl ctions 11
7 El ctrical Conn ction 13
7.1 G n ral 13
7.2 Wiring Diagram 14
8 Commissioning 22
8.1 Alignm nt of WSU and
WEU 22
8.2 Alignm nt of WSU and
WEU with Alignm nt Aid
AR 60 22
8.3 Ch cking 22
9 Maint nanc 23
10 Commissioning 23
11 Malfunctions 23
11.1 Diagnostic El m nts 23
12 T chnical Data 25
13 Dim nsional Drawing 26
14
At a glanc : What is n w?
31
15 S l ction Tabl ,
WSU/WEU 32
15.1 Conv rsion List 33
16 S l ction Tabl ,
Acc ssori s 34
This t chnical d scription must b obs rv d wh n installing and
commissioning th WSU 26/2 - WEU 26/2. Insp ction and
commissioning must b carri d out by sp cialists, if this is sp cifi d in th
dir ctiv s or guid lin s.
Approvals
EU Europe
EC prototyp t st conduct d by
BG - B rufsg noss nschaft
(Trad association)
Fachausschuß Eis n und M tall III
(T chnical committ
for iron and m tal III)
Graf-R ck -Str. 69
D-40239 Düss ldorf
Approval numb r: 97074
3
SICK WSU 26/2 – WEU 26/2
8 008 692/9-12-99 T chnical D scription · WSU/WEU 26-2 © SICK AG · Saf ty Syst ms · G rmany · All rights r s rv d
1 G n ral Introduction
1 General Introduction
Scanning rang 0.5 ... 18 m
15 ... 70 m
B am diam t r 23 mm
Fig. 1: Syst m construction of th WSU 26/2 / WEU 26/2 photo l ctric saf ty switch
Th WSU 26/2 / WEU 26/2
photo l ctric saf ty switch is a sin-
gl -b am non-contact prot ctiv
syst m. It consists of a WSU light
s nd r and a WEU light r c iv r.
Th light b am b tw n th
mitting and r c iving units
provid s acc ss prot ction for
hazardous ar as.
Th saf ty switch is d sign d for
industrial applications. Its f atur s
includ
‡univ rsal usability
‡asy installation
‡solid construction
‡h at d front scr n, i. . it can b
d ploy d v n in unfavorabl
ambi nt conditions.
Th WSU/WEU compli s with
saf ty r quir m nts according to
pr EN 50.100, saf ty cat gory typ 4.
Th following k y data ar
applicabl in practical us :
Rang
B am diam t r
23 mm
WSU WEU
4
SICK WSU 26/2 – WEU 26/2
8 008 692/9-12-99 T chnical D scription · WSU/WEU 26-2 © SICK AG · Saf ty Syst ms · G rmany · All rights r s rv d
3 D scription of Function
2 Device/System Construction
Th WSU 26/2 / WEU 26/2 s rv s
as a prot ctiv cut-off d vic to
prot ct hazardous ar as on pow r-
driv n machin ry. Th machin ry
may b :
‡plastics machin ry
‡stack rs
‡s ttling machin ry
in th ston working industry
‡machining c nt rs
Th WSU/WEU 26/2 must not b us d as a hand or fing r guard.
Th WSU/WEU compris s:
‡WSU 26/2 s nd r unit and
‡WEU 26/2 r c iv r unit
Each compl t br ak in th light
b am b tw n th light s nd r and
light r c iv r trigg rs a signal which
can b us d to imm diat ly stop
th dang rous mov m nt of th
pow r-driv n machin ry
(abbr viat d as ”PDM”).
3 Description of Function
Th WSU and WEU ar mount d
s parat ly in di -cast housings. Each
has its own pow r supply (Fig. 2).
Th WSU contains a clock
g n rator and th s nd r diod .
Th diod mits infrar d puls s at
th clock rat s t by th g n rator,
which ar valuat d by th r c iv r
unit WEU if th light path is
unint rrupt d.
Th WEU contains th output
r lays A and B, which pick up if th
light path is unint rrupt d.
If th light path or th conn ction
b tw n t rminals 10 and 11 on
th WSU is int rrupt d (t sting),
both r lays ar r l as d.
1 Conn ction
for pow r supply
2 Pow r supply
3 Clock g n rator
4 S nd r diod
5 LED, WSU
6 LED, WEU
7 Photo l ctric conv rt r
8 Amplifi r
9 R lay with positiv ly-driv n contacts
10 Outputs
11 T st contact
Fig. 2: Principl of function of th WSU/WEU 26/2, AC v rsion
5
SICK WSU 26/2 – WEU 26/2
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4 Possibl Ar as of Application
4.1 ossible Areas
of Application
Th WSU/WEU provid s acc ss
prot ction for hazardous ar as
(Fig. 3).
4.2 Application
Conditions
Saf cut-off can only b ff ct d
wh n th light b am diam t r of
23 mm is fully cov r d.
Th prot ctiv function of th
WSU/WEU is nsur d wh n th
conditions s t out in th adjac nt
box ar m t.
4 ossible Areas of Application and Application Conditions
Th pow r-driv n machin ry (”PDM”) must b
controllabl by l ctrical m ans.
Th dang rous mov m nt of th machin must b abl
to b stopp d at any tim .
Th WSU/WEU must b position d so that ntry into
th hazardous ar a is only possibl by br aking th light
b am.
Th command unit must b position d so that it cannot
b activat d from th hazardous ar a.
6
SICK WSU 26/2 – WEU 26/2
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5 Mechanical Arrangement and Mounting
5 M chanical Arrang m nt
Fig. 4: Saf ty distanc to light b am
Table 1 shows which C valu must
b us d for which application.
Number of beams 010203
H ight of b am(s) 750 400 0300
abov floor (mm) 900 0700
1100
C 1200 850 0850
Tabl 1: H ight of b ams abov floor
pr EN 999
Saf ty of machin ry
Approach sp d of body parts
for arrang m nt of prot ctiv
syst ms
Th WSU/WEU must b attach d such that, if th light b am is
brok n during hazardous mov m nt of th machin ry, th point-
of-op ration can only b r ach d wh n th pow r-driv n
machin ry is no long r in a hazardous stat .
For this purpos , a saf ty distanc must b maintain d b tw n th
light b am and th n ar st boundary of th point-of-op ration.
This saf ty distanc is d t rmin d according to pr EN 999.
P opl within th hazardous ar a but outsid th light b am ar
not d t ct d. It must, how v r, b nsur d that any hazardous
stat can only b initiat d wh n th r is no on in th hazardous
ar a.
Us and mounting of th prot ctiv syst ms is subj ct to th r l -
vant official rul s and r gulations. Th s provisions diff r d p nding
on th ar a of application.
5.1 Safety distance
Th WSU/WEU must b attach d
such that, if th light b am is
brok n during hazardous
mov m nt of th machin ry, th
point-of-op ration can only b
r ach d wh n this hazardous
mov m nt has c as d. For this
purpos , a saf ty distanc S must
b maintain d b tw n th n ar st
boundary of th point-of-op ration
and th light b am (Fig. 4). Th
saf ty distanc d p nds on th
machin stopping tim and on th
approach sp d of th p rsonn l.
Th machin stopping tim must b
d t rmin d by r p ating
m asur m nts und r practical
conditions. 1.6 m/s is th
r comm nd d approach sp d.
Th saf ty distanc is calculat d as
follows:
S = v (t1 + t2) + C
S Saf ty distanc (mm)
v Approach sp d
1.6 m/s
t1Machin stopping tim (ms)
t2R spons tim of WEU (22 ms)
C D p nd nt on numb r of b ams
(1, 2, or 3), s Tabl 1
M chanical
saf guarding
Point-of-op ration
S
Entry/ xit
guarding
with
WSU/WEU Dir ction
of ntry
into
hazardous
ar a
7
SICK WSU 26/2 – WEU 26/2
8 008 692/9-12-99 T chnical D scription · WSU/WEU 26-2 © SICK AG · Saf ty Syst ms · G rmany · All rights r s rv d
Fig. 5: Mounting options using a mounting brack t
Ord r numb r
Mounting brack t
2 007 900
5.2 Mechanical Mounting
Th WSU and WEU units can b
mount d on on of th sid s of
th ir housing or using th mounting
brack t, d p nding on sit
circumstanc s. Th mounting
brack t gr atly assists alignm nt.
Th d vic s can b mount d in any
op rating position. How v r, th
WSU and WEU should b
mount d such that th axis of th
light b am mitt d by th WSU
always match s th axis of th
WEU optic (alignm nt sight).
Th mounting brack ts should b
affix d so that all fixing scr ws ar
asily acc ssibl for alignm nt
purpos s. Figur 5 shows xampl s.
Th d vic s should b attach d
such that th opposing d vic can
b align d in th alignm nt sight.
If, for r asons of spac , th d vic s
n d to b arrang d as shown in
Figures 5 a and b, h xagon scr ws
must b us d.
Wh n using th
15 + PE plug,
mounting mod s
a and b
ar not possibl .
a
b
c
d
8
SICK WSU 26/2 – WEU 26/2
8 008 692/9-12-99 T chnical D scription · WSU/WEU 26-2 © SICK AG · Saf ty Syst ms · G rmany · All rights r s rv d
5.3 Multiple
Safeguarding
Wh n using two WSU/WEU units
in a prot ctiv syst m, th
possibility of mutual int rf r nc
must b xclud d. Sinc th light
b am of th WSU div rg s, th
cross-s ction of th b am incr as s
as th distanc b tw n th WSU
and WEU grows. Th following
conditions must th r for b m t
wh n arranging th WSU/WEU:
5.3.1 Mutual Interference
Th light b am of th WSU must
only b r c iv d by th
corr sponding WEU. To pr v nt
mutual int rf r nc b tw n
s v ral WSU/WEU installations
arrang d adjac nt to or abov ach
oth r, th sp cifi d b am diam t rs
must b tak n into account wh n
mounting th d vic s (Fig. 6).
Fig. 6: Saf guarding a hazardous ar a with WSU/WEU
Mutual int rf r nc is possibl
Th r ar two v rsions
of th WSU, for
op rating rang s
0.5 ... 18 m and
15 ... 70 m. Th WSU
must not b us d for
op rating rang s b low
15 m. Th op rating
rang is giv n on th
rating plat .
Corn r mirror
approx. 900
approx. 400
Corn r mirror
Corn r mirror
9
SICK WSU 26/2 – WEU 26/2
8 008 692/9-12-99 T chnical D scription · WSU/WEU 26-2 © SICK AG · Saf ty Syst ms · G rmany · All rights r s rv d
Fig. 7: Mounting of two WSU/WEU units in s ri s
WEU
WSU
WSU
WSU
WEU
WEU
WSU
WSU
WSU
WEU
WEU
WEU
10
SICK WSU 26/2 – WEU 26/2
8 008 692/9-12-99 T chnical D scription · WSU/WEU 26-2 © SICK AG · Saf ty Syst ms · G rmany · All rights r s rv d
Th us of corn r mirrors r duc s th scanning rang
of th WSU/WEU syst m as cit d in th tabl .
Numb r of mirrors R duc d scanning rang R duc d scanning rang
0.5 ... 1 m WSU 15 ... 70 m WSU
1 17 m 67 m
2 15.5 m 61 m
3 13 m 51 m
4 11 m 42 m
Tab. 2: R duction in scanning rang wh n using corn r mirrors
Fig. 8: Multi-sid d prot ction of hazardous
ar as
Fig. 9: Two-b am prot ction with a WSU/WEU 26 syst m
Corn r mirror
Corn r mirror
5.4 Corner mirrors
In conjunction with corn r mirrors,
th WSU/WEU provid s multi-
sid d, two-b am acc ss prot ction
(Fig. 8 and 9).
KA
R fl ction
possibl
Saf ty distanc
too small
Corn r mirror Corn r mirror
Hazardous ar a
Pow r-driv n
machin ry
(PDM)
Corn r mirror
Hazardous ar a
Pow r-driv n
machin ry (PDM)
Th us of mor than 2 mirrors r quir s a v ry accurat
alignm nt.
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