SICK WEU 26/2 Parts list manual

TECHNICAL DESCRIPTION
‡ EASY INSTALLATION †
‡ UNIVERSAL USABILITY†
‡ SOLID CONSTRUCTION †
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch

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SICK WSU 26/2 – WEU 26/2
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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

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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

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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

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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.

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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

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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

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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

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Fig. 7: Mounting of two WSU/WEU units in s ri s
WEU
WSU
WSU
WSU
WEU
WEU
WSU
WSU
WSU
WEU
WEU
WEU

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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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6 Mounting
6.1 Mounting
Requirements
Th d vic s should b mount d
and conn ct d in accordanc with
th on-sit application conditions
and conn ctions, taking account of
th following:
Th scanning rang is bas d on th width of th ar a b ing
prot ct d. Bypassing or ncircling must b pr v nt d by suitabl
(m chanical) m ans.
Wh r on or mor WSU/WEU units ar us d, th h ight and
numb r of light b ams must comply with th applicabl
r gulations.
Th r must b no r fl ctiv surfac s in th mitting or r c iving
b am path.
Th minimum distanc must b maintain d.
6 Mounting
6.2 Detecting
Reflections
Th light b am must not b
unint ntionally r fl ct d back to th
r c iv r by r fl ctiv surfac s.
R fl ctions can b d t ct d as
follows:
Cov r th light b am b tw n th s nd r and r c iv r fully with
an obstacl (100 mm x 100 mm) and slowly mov th obstacl
from th s nd r unit to th r c iv r unit.
Whil this is happ ning th gr n LED on th WEU must not
light up. If it lights up v n just bri fly during this ch ck, r fl ction
is occurring.
S also 8. Commissioning.
Fig. 11: Corr ct mounting, corr ctly align d: r fl ctiv obj ct outsid div rg nt light b am.
No r fl ction. Th obstacl is cl arly d t ct d.
Fig. 10: Incorr ct mounting: r fl ctiv obj ct in div rg nt light b am. No d t ction of th
obstacl du to r fl ction. No prot ction.
C ntral b am
Entry dir ction B am array
brok n
Boundary
of point-of-
op ration
R fl ctiv obj ct
( .g. mat rial contain r)
C ntral b am
R fl ctiv obj ct
( .g. mat rial contain r)
Boundary
of point-of-
op ration
Entry dir ction B am array
brok n

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Fig. 12: Distanc a as a function of scanning rang SR
a (mm)
2500
2000
1500
1000
500
400
300
200
100
3
10 6 20 12 40
9
30 18 60
15
50 21 70
WSU WEU
4°4°
a
a
a (70 m)
a (18 m)
RW (m)

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B for conn ction, ch ck that th
supply voltag and mains fr qu ncy
on-sit ar consist nt with th
sp cifications on th rating plat .
Th cabl is f d through th PG
conn ctor and conn ct d insid th
d vic , or conn ct d to th
quipm nt plug. Th wiring diagram
is d pict d again on th housing
cov r of th r sp ctiv d vic .
Th nclosur rating for th d vic s
can only b guarant d wh n th
cabl is prop rly clamp d in th PG
conn ctor and th housing s als fit
p rf ctly. Wh r long l ads ar
us d, th cabl cross-s ctions
should b chos n to nsur th
d vic s ar always suppli d with
th r quir d voltag (s T chnical
Data).
7 Electrical Connection
7.1 General Introduction
D p nding on typ , th WSU/WEU
26/2 photo l ctric saf ty switch is
availabl for a supply voltag of
‡24 V DC
‡115 V AC or
‡230 V AC.
Th rating plat giv s d tails.
At l ast two outputs must b
conn ct d to th downstr am
machin controll r (Fig. 20/21).
Each of th two outputs (NO
contacts) must b assign d an
l ctromagn tic switching l m nt.
7 El ctrical Conn ction
Arc-suppr ssion l m nts ar ss ntial und r inductiv load!
Arc-suppr ssion l m nts must b conn ct d in parall l with
th inductanc . Conn ction in parall l with th output contact
is not p rmitt d.
Diod s must not b us d as arc-suppr ssion l m nts.
Tab. 3: Ov rvi w for arc-suppr ssion l m nts
Guid valu s for arc-suppr ssion l m nts
Operating voltage Order no. R C
VΩµF
115 ... 230 6 001 224 220 0.22
24 6 001 225 100 2.2
Plastic- ncapsulat d; conn cting wir s NYAF 0.5
dia. with cabl lugs; mounting with adh siv tap
or cabl ti .
Th two syst m compon nts must
b of th sam voltag v rsion and
th sam scanning rang s.
Singl - or fin -wir conductors up
to 1.5 mm2 can b conn ct d to
th scr wl ss t rminals (to VDE
0607). Stripping l ngth: 11 mm.
Op rating
voltag C
R
Contact
in WEU
Consum rs,
contactor
Th l ctrical conn ction of th WSU/WEU must only
b mad or chang d with th pow r disconn ct d.
Unscr w th housing cov r to conn ct th WSU/WEU
with a PG conn ctor.

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7.2 Wiring Diagram
Fig. 14: Wiring diagram WSU/WEU for AC supply, with PG conn ctor
Fig. 13: Wiring diagram WSU/WEU for 24 V DC supply, with PG conn ctor
1/2 3456789
PE +24V
1/2 31011
PE +24V 0V 0V
1/2 3456789
PE
1/2 31011
PE 230V/
115 V NN
230V/
115 V
Connecting leads max. 1.5 mm2
WSU
T st contact (10, 11)
Floating U 24 V DC
I 10 mA
Op ning tim t ≥ 50 ms
WEU
Outputs (4 - 9)
Umax. 250 V AC
Imax. 2 A p r output
Imin. 0.02 A p r output

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Fig. 15: Wiring diagram WSU/WEU 26/2 for 24 V DC supply, int rchang abl d sign
1/2 31011
1234
2
3
45
6
1
AB
C
D
E
F
GCod d to
A or
Equipm nt plug
PE +24V 0V
1/2 31011
5634
2
3
45
6
1
AB
C
D
E
F
GCod d to
E or. 4
Equipm nt plug
PE +24V 0V
2
3
45
6
1
AB
C
D
E
F
GCod d to
B or 1
Equipm nt plug
1/2 3456789
1236
45
2
3
45
6
1
AB
C
D
E
F
GCod d to
D or 5
Equipm nt plug
PE +24V 0V
1/2 3456789
123645
2
3
45
6
1
AB
C
D
E
F
GCod d to
E or 4
Equipm nt plug
PE +24V 0V
1/2 3456789
563 4
12
2
3
45
6
1
AB
C
D
E
F
GCod d to
E or 4
Equipm nt plug
PE +24V 0V
WSU 26/2 -131
231
WEU 26/2 -131
231
WSU 26/2 -133 WSU 26/2 -233 WEU 26/2 -132
232
WEU 26/2 -133
233

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Fig. 16: Wiring diagram WSU/WEU 26/2 for AC supply, int rchang abl d sign
1/2 31011
1234
PE N
1/2 31011
5634
2
3
45
6
1
AB
C
D
E
F
G
Cod d to
A or
Equipm nt plug
2
3
45
6
1
AB
C
D
E
F
G
Cod d to
G or 2
Equipm nt plug
N
1/2 3456789
123645
1/2 3456789
PE N
563124
2
3
45
6
1
AB
C
D
E
F
G
Cod d to
A or
Equipm nt plug
2
3
45
6
1
AB
C
D
E
F
G
Cod d to
C or 6
Equipm nt plug
WSU 26/2 -121
-221
-111
-211
2
3
45
6
1
AB
C
D
E
F
G
Cod d to
F or 3
Equipm nt plug
WEU 26/2 -112
-122
-212
-222
WEU 26/2 -113
-213
-123
-223
WSU 26/2 -113 WSU 26/2 -213
N
230 V/
115 V
PE
PE
230 V/
115 V 230 V/
115 V
2
3
45
6
1
AB
C
D
E
F
G
Cod d to
F or 3
Equipm nt plug
WSU 26/2 -123
-223
230 V/
115 V
2
3
45
6
1
AB
C
D
E
F
G
Cod d to
C or 6
Equipm nt plug
WEU 26/2 -121
-221
2
3
45
6
1
AB
C
D
E
F
G
Cod d to
G or 2
Equipm nt plug
WEU 26/2 -111
-211
1/2 3456789
1236
45
PE 230/
115 V N
Fig. 17: Pin assignm nt WSU/WEU 26/2, AC/DC v rsion with quipm nt plug (15 + PE)
ABC
124 V n.c. T st
L 1
(1/2) (10)
20V n.c. T st
N
(3) (11)
3n.c. n.c. n.c.
4n.c. n.c. n.c.
5n.c. n.c. n.c.
(...) T rminals on l ctronic card (...) T rminals on l ctronic card
ABCWSU 26/2 -114
-214
-124
-224
-134
-234
1
2
3
4
5
+24V/L1 (1/2)
0V/N (3)
T st (10)
T st (11)
PE
ABC
WEU 26/2 -114
-214
-124
-224
-134
-234
1
2
3
4
5
+24V/L1 (1/2)
0V/N (3)
S1 (4)
Ö1/2 (6)
S2 (8)
S1 (5)
Ö1/2 (7)
S2 (9)
PE
ABC
124 V n.c. n.c.
L 1
(1/2)
20V n.c. n.c.
N
(3)
3n.c. n.c. n.c.
4S 1 Ö 1/2 S 2
(4) (6) (8)
5S 1 Ö 1/2 S 2
(5) (7) (9)

17
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
For lin dia. 6 ... 9 mm
Pay att ntion
to coding!
Fig. 18: Cabl r c ptacl s 6 + PE
Plugs and sock ts:
DIN 43651: 6 + PE
with crimp contacts
For lin dia. 4 ... 11 mm
angl d
Ord r no. 6 006 613
Important: Mark plug and sock t
unambiguously! Th WEU sock t
must not b conn ct d
to th WSU plug
In som cas s no long r compli s with
r quir m nts for cl aranc and
cr pag distanc s (VDE 0160 05/88
and VDE 0110); s s l ction tabl .
78
M 26x1,5
ø 28
straight
Ord r no. 6 006 612
55,2 11
15,2
29,5
7,5
25,5
53
Fig. 19: Cabl r c ptacl s 15 + PE
PG
63
54.5
29.5
63
PG
29.5
47
Ord r no. 2 019 076
Ord r no. 2 019 075
M 26 x 1.5
dia. 28
55.2
15.2
29.5
7.5
22.5
54.5
29.5
29.5
16
13.5
63 29.5
47
PG 13.5

18
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. 20: WSU/WEU 26/2 with Saf ty Int rfac LCU-X
0 V
PE
+24V
S1
k1 k2
A1 A2 PE To PE T13 T14
X11 X12
T21 T22 X21 X22
13 23 31
2)
C1 D1 PE C2 D2 PE T3 T4 C3 D3 PE C4 D4 14 24 32
K1 K2
1) xy
k1 k2
xy
z
k1
k2 z
PE
3
1/2
10
11
WSU WEU
PE
0V
+24V
T st
T st
+24V
0V
PE PE
3
5
9
8
4
1/2

19
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. 21: WSU/WEU 26/2 with PNOZ 8 (Pilz); BIA-t st d application no. 01131202933
1/2
1
12 3
1
2
3
23
WSU
+24V
0V
WEU
A1+ S52 S12 S22 S21 13 23 33 41 Y36
S11 Y1 Y2 A3 14 24 34 42 Y37 A2
32 3
&
+24V
Y32
Y35
0V
Start
10
311
1/2 4 8 6
3597
Outsid switch cabin t s parat lin laying to r c iv r. T rminals 1, 3, 8 and 9 and 4, 5, 6 and 7 r sp ctiv ly in on plastic-sh ath d
cabl . Us PG 21 (ord r no. 5 305 978) and PG xt nsion (ord r no. 5 306 052).

20
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
K1 to K4 Contactors or r lays with positiv ly-driv n contacts
(not suppli d)
Fu Arc-suppr ssion, ss ntial
S Command unit, .g. pushbutton, k y-op rat d switch tc.
Pr ss button S to start, oth rwis r d LED on WEU r mains lit.
x and y Ins rt in saf machin controll r to int rrupt th hazardous
mov m nt. For saf ty r asons, th two contact rows (x and y)
must b ins rt d s parat ly into th controll r (two-chann l).
z If, in xc ptional cas s, d p nding on th risk ass ssm nt, th
controll r of th pow r-driv n machin ry is only of singl -chann l
d sign, contact row z can b us d.
Fig. 22: Exampl of a conn ction with on WSU/WEU-26 syst m
k 1
k 2
k 3
k 4
K 1 K 2 K 3 K 4
k 1
k 2
k 3
k 1
k 2
k 3
S
k 4
k 1
k 2
k 3
k 4
k 1
k 2
k 3
k 4 k 4
F