
3.3 Structure and function
The ULVT/BLVT safety light barriers consist of two components:
The light transmitter and receiver. The distance between the two
components and the installation height are calculated from the
width and height of the protective field (Fig. 9/1).
Due to its modular structure, protective field heights between
100 mm and 1900 mm can be attained (Table 8/1).
The transmitter and receiver are synchronous, i.e., at any one
time, only one light beam and one receiving element are active.
Synchronization is implemented by the first light beam and the
first receiving element. An electric connection between the
transmitter and receiver is therefore not required.
The transmitter generates infrared light beams which are
switched on an off in quick succession. The parallel light beams
at a distance of 7.5 mm are assessed by two single-chip
microcontrollers. The beam distance produces a definition of 14
mm.
(see table 9/2).
If an object is located within the protective field, i.e., at least one
of the light beams is blacked out, the two outputs of the receiver
will stop the hazardous movement of the machine and/or prevent
a start. In the operating mode with restart interlock, the machine can only be restarted by actuating the start button when the
protective field is free again.
3.4
Protective field height, constructional length, ranges, resolutions, beam spacings and number of beams
3
System description
Structure and Function, tables
ø of test rod = obstacle size
protective field
width
pro
t.
fie
ld
h
ei
gh
t
Protective
Field height
(mm)
Constr
length
L (mm)
Beam spacing
7,5 mm
No. of beams
Beam spacing
14 mm
No. of beams
Beam spacing
100 mm
No. of beams
Beam spacing
200 mm
No. of beams
Beam spacing
300 mm
No. of beams
Beam spacing
400 mm
No. of beams
Beam spacing
500 mm
No. of beams
Beam spacing
500 mm
No. of beams
100
200
196
296
13
26
7
14
-
3
-
2
-
-
-
-
-
-
300
400
500
500
396
496
39
52
596
650
65
21
28
4
5
35
6
-
3
2
-
-
ULVT500/2R: beam deflection via separate passive mirror unit. Wiring required on one side only.
-
-
2
-
-
-
2
2
600
700
800
900
696
796
78
91
896
996
104
117
1000
1100
1200
1300
1096
1196
130
143
1296
1396
156
169
42
49
7
8
56
63
9
10
4
-
3
-
5
-
-
4
70
77
11
12
84
91
13
14
6
-
-
-
7
-
5
-
-
-
-
-
3
-
-
-
-
-
3
-
4
-
-
-
1400
1500
1600
1700
1496
1596
182
195
1696
1796
208
221
1800
1900
1896
1996
234
247
98
105
15
16
112
119
17
18
8
-
-
6
9
-
-
-
126
133
19
20
10
-
-
-
-
-
-
4
5
-
-
-
-
-
-
-
Table 9/2 Available standard sizes
Finger protection
resolution 14 mm
Hand protection
resolution 30 mm
Pedestrian
Access Protec-
tion
Pedestrian
Access Protec-
tion
Pedestrian
Access Protec-
tion
Pedestrian
Access Protec-
tion
Pedestrian
Access Protec-
tion
Pedestrian
Access Protec-
tion
Range
7 m / 10m
Range
24 m / 30m*
Range
24 m / 30m*
Range
24 m / 30m*
Range
24 m / 60 m*
Range
24 m / 60 m*
Range
24 m / 60 m*
Range
8 m
Table
fig. 9/1 transmitter and receiver form the protecfive field
FIESSLER
E L E K T R O N I K
co
n
str
u
cti
o
n
al
le
n
g
th
L
* = At 60m version: Operation of> 15-60m. No operation <15m distance from transmitter to receiver.
* = At 30m version: Operation of> 15-30m. No operation <15m distance from transmitter to receiver.
9
Fiessler Elektronik GmbH & Co. KG
Doku Nr. 958 Stand 22.01.2018 RK
Phone: +49 (0) 711 / 91 96 97-0 Internet: http://www.fiessler.de
Fax : +49 (0) 711 / 91 96 97-50 eMail: [email protected]