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8 007 487/ 10-10-99 Technical Description • LGT © SICK AG • Safety Systems • Germany • All rights reserved
5.3.7 Sender power
setting
The LGT has a sender power set-
ting option to enable the sender
power to be optimally matched to
the ambient conditions and to
match the control unit to the light
grid types (more than one pair in
use). This ensures that the aperture
angle always remains below the re-
quired value of
±
4
°
thus preventing
unnecessary load on components.
The sender power is set as follows:
1 Mount the LGT in its final posi-
tion
2 Select "Calibration" mode: set
DIP switches (Fig. 15) set to
control unit print.
3 Switch on the power supply
A digit, which depends on whether
one or two light grids are con-
nected to the control unit, then
appears on the seven-segment dis-
plays:
Left-hand display
for screen1
Right-hand display for screen 2
4 Adjusting the LGT strips for
maximum
value on the seven-
segment display, e. g. "8"; range-
dependent (e. g. range 6 m –
display
≥
2).
5 Deactivate "Calibration" mode:
DIP switches.
Caution:
There must be no intrusion into the
protective field during the
shutdown operation.
The sender power setting is thus
stored.
Once the sender power has been
set, the LGT is set for optimum
operation at the required installa-
tion position.
Important:
The sender power must always be
reset before the unit is commis-
sioned and each time the sender
and receiver strips are replaced.
5.3.8 Blanking
If mechanical brackets for guiding
material are located in the protec-
tive zone, this area must be
blanked out. For this purpose, up
to 4 beams on the LGT can be
blanked out, i.e. they no longer
have an effect.
Attention:
Since gaps in the protective field
are produced as a result of blanking,
these gaps must be guarded by
other (e. g. mechanical) safety
devices.
The blanking is set as follows:
1 Mount the LGT in its final position
2 Switch off the power supply
3 Select "blanking" mode: DIP
switches (Fig. 15)
4 Switch on the power supply
A digit then appears on the two
seven-segment displays, depending
on whether one or two light
screens are connected to the con-
trol unit. The digit indicates the
number of beams which are
blanked. After approx. 20 seconds
the seven-segment display switches
to a flash mode with "17", and the
yellow LED in the control unit lights
up. This means that the blanking
setting is stored. It is not possible to
blank out more than
4 beams.
5 Deactivate "blanking" mode: DIP
switches.
The blanking setting is thus stored.
6 Switch off the power supply and
switch it on again or upplug the
reset jumper and re-insert it.
7 Make sender powering as
described under 5.3.7.
After the blanking setting has been
completed, the protective zone
must be checked with a test rod
(30 mm Ø).
The blanking setting also remains
stored in the event of a power
failure.
An existing blanking setting is dis-
played continuously as per Fig. 21,
bottom.
Strip pair 1
blanked
Strip pair 2
blanked
Both strip pairs
blanked
Fig. 21. Blanking shown in display
