7 BLVT-blanking functions -important application advices
Tabelle 31/1
important advices and restrictions
resolution at be-
am spacing 7,5
mm / 14 mm
the slightly longer response time of the BLVT compared ti the ULVT applies here too (refer to
tables on page 13)
Blanking of up to 5 objects which are fixed in the protective field
During operation, the position of the blanked sectors may be swaying ±1 beam upwards and
downwards.
During operation, the number (extent) of the programmed blanked beams must never increa-
se, but can be only reduced by only one beam.
You should program only the sectors in those positions where the blanking will mask as many
receiver elements as possible, otherwise problems caused by vibrations might occur.
However, if only 1 beam is blanked, this one must not be cleared. During programming, at le-
ast three beams must remain cleared between the sectors.
full resolution, sa-
me as standard
ULVT :
14 mm / 30 mm
full resolution out-
side the blanked
sectors:
14 mm / 30 mm
3. fix blanking
resolution redu-
ced by 1 beam
fig 30/3
4. fix blanking
resolution redu-
ced by 2 beams
fig 30/3
5. floating
blanking
fig 30/1
6. Ortsvariable
Ausblendung
resolution redu-
ced by 1 beam
fig 30/2
same as no. 2, but:
During programming, between the blanked sectors, at least 5 beams must be free. Additio-
nally, only 1 beam may be interrupted at any number of positions.
((except for the synchronizatuion beam)
same as no. 2, but
During programming, between the blanked sectors, at least 7 beams must be free. One, or
max. 2 adjacent beams may be additionally be interrupted at any number pf positions. )
(except for the synchronization beam)
reduced resolution
outside of the blan-
ked sectors:
22 mm / 42 mm
reduced resolution
outside of the blan-
ked sectors:
29 mm / 56 mm
1 sector (at least 2 adjacent beams), that is permitted to move within the protective field
during operation, can be blanked. During the programming, this sector must not move. The
number of the programmed beams of the blanked sector must not increase by the vibrations
of the machine during operation, but it may decrease by one beam.
same as no. 5, but:
The blanked sector must interrupt at least 3 adjacent beams.
Additionally, every one beam may additionally be interrupted at any number of positions.
(except for the synchronization beam)
full resolution out-
side the blanked
sectors:
14 mm / 30 mm
reduced resolution
outside of the blan-
ked sectors:
22 mm / 42 mm
yellow/
orange LED
flicker at
ca.1 Hz
yellow/
orange LED
flicker at
ca.1 Hz
yellow/
orange LED
flicker at
ca.1 Hz
yellow/
orange LED
flicker at
ca.1 Hz
7. Ortsvariable
Ausblendung
resolution redu-
ced by 2 beams
fig 30/3
8.
resolution re-
duced by 1 be-
am
fig 30/4
9.
resolution re-
duced by 2 be-
ams
Bild 30/5
10. skip 1 beam
only once
fig 30/6
same as no. 5, but:
The blanked sector must interrupt at least 4 adjacent beams.
Additionally, every one beam, but max. 2 beams may additionally be interrupted at any
number of positions.
(except for the synchronization beam)
Every one beam may be interrupted at any number of positions.
(except for the synchronization beam)
If there is more than one object within the protective field, there must be at least one beam
in-between that remains free.
reduced resolution
outside of the blan-
ked sectors:
29 mm / 56 mm
reduced resolution
:
22 mm / 42 mm
One beam or max. 2 beams may be interrupted at any number of positions.
(except for the synchronization beam)
If there is more than one object within the protective field, there must be at least one beam
in-between that remains free.
1 beam may be interrupted at any one position within the protective field.
(except for the synchronization beam)
reduced resolution
:
29 mm / 56 mm
no obstacle: 22 mm
/ 42 mm with
obstacle: full resolu-
tion of the remai-
ning protective field
14 mm / 30 mm
11. Skip 2 be-
ams only once
fig 30/7
2 beams may be interrupted at any one position within the protective field.
(except for the synchronization beam)
no obstacle: 29 mm
/ 56 mmwith obsta-
cle: full resolution of
the remaining pro-
tective field 14 mm
yellow/
orange LED
flicker at
ca.1 Hz
yellow/
orange LED
flicker at
ca.1 Hz
yellow/
orange LED
flicker at
ca.1 Hz
yellow/
orange LED
flicker at
ca.1 Hz
yellow/
orange LED
flicker at
ca.1 Hz
7.3 Important advices, restrictions and explanations of the resolutions of the different blanking patterns
Caution, synchronizing beam: The first beam (seen from the plug end) must never be masked, because this first beam
serves a a synchronization means for transmitter and receiver. If this first beam is masked during the teaching/program-
ming procedure, the light curtain will turn into error mode. Both orange and yellow LEDs on the receiver will start to flash
quickly (ca. 4 x /s). If during operation, the synchronizing beam is interrupted, the outputs of the BLVT will be shut off.
The blanked sectors must cover the whole lengh of the protective field between transmitter and receiver in order to prevent
any reaching into the field from the side.
Missing obstacles in the blanked sectors or obstacles with diameters others than programmed will deactivate the outputs of
the BLVT light curtain.
FIESSLER
E L E K T R O N I K
31
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: info@fiessler.de
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