3
EDS-TECHNICALINFORMATION
4-OPTICALALIGNMENT
4.1- Go on with the opticalalignmentbetweenthe
transmitterand the receiver.To make thisoperation
easier, we recommend to do it in a reduced light
environment and to proceed as follows.
a) shift the JP2 jump to position 2-3 and rotate
the P4 internal trimmer for the sensitivity
regulation fully clockwise (to the highest
sensitivity). See P4 trimmer in the scheme fig. 8.
b) place a lamp that can emit a concentrated and
sufficiently bright beam (we recommend our
LAL02 lamp to execute the optical alignment
exactly) in front of the receiver. Point the lamp
beam right to the transmitter lens (fig. 3).
c)look at the screen behind the lens of the
transmitter through the slit placed on the lens
support.Abright point representingthe lampimage
will be visible on it.Adjust the optical equipment,
using the proper V screws (see fig. 7) and the key
included, so that the bright point falls in the
screen's center where there's a small hole through
which the photoemitting diode can be seen. It is
important that the bright point drops on the
photoemitting zone of the photodiode (fig. 4).
Using this procedure the receiver should be
perfectly optically aligned to the transmitter.
4.2 - Bring the lamp from the receiver to the
transmitter and place it in front of it. Repeat the
same suitable operations of 4.1 this time directing
thelight beam to the lens of the receiver.
4.3- The bright point that willappearon the screen
set behind the lens of the receiver, must fall to the
center of the photosensitive element that is found
behind the screen in match of the small hole on it
practised. In such way the receiver will optically
be found lined up with its transmitter.The small
bug of due possible angle to the fact that the lamp
has not exactly been set on the axle of the lens, is
negligiblegenerallyandeasilyeliminablethrough
following small regulations.
5 - SETUP
5.1 - Power up the device. If the previous optical
alignementoperations havebeen carefully carried
out, the following conditions of the receiver must
be found:
internal red LED light switched off
internal yellow LED light switched off
alarm relay R not powered or powered.
This depends on the position of the JP3 jump (see
fig. 8)
buzzer or LED connected to the OC output
terminal not powered (see fig. 9)
voltage at terminal TP1 (see 3.1) higher than 3 V
5.2 - Looking at the instrument's measure
(connected between TP1 and negative terminal)
adjustthe V screws slowly to obtainthe maximum
output signal. If this operation is not sufficient to
obtain a good output, it means that the optical
alignment with the trasmitter has been done
incorrectly.
5.3- The transmitter emits a conic beam, whose
form and size related to the distance are shown in
figures 5 and 6. It is important that the receiver is
inthe center ofthebeam emitted bythe transmitter,
because in these conditions, even if some small
movements of the wall or surface on which the
device is assembled occur (caused by the strains),
the receiver always remains inside the beam. To
obtain this, the delicate alignment operations with
signal measure, as decribed in points 4.1and 5.2,
must be carried out with the greatest care.
5.4-Adjustthe sensitivityoperatingon P4 trimmer
and remembering what follows:
highsensitivity isobtainedwith signalsbetween
3 and 5V (between TP1 and negative terminal)
medium sensitivity is obtained with 5-8 V
low sensitivity is obtained with 8 V or more
Remember that the adjusted signal is subjected to
a lowering of about 1 V when the device cover is
assembled, due to the frontal mask absorption.
Therefore the signal must be increased of about
1 V to be obtain a perfect adjustment.
5.5 - The sensitivity is to be adjusted according
to the environmental situation. Normally the level
is set for a medium sensitivity, but in case of dusty
environments (furniture factories, ecc) it is better
to use a lower sensitivity (8 V and over).
5.6- Thedeviceisfactoryset toworkwithnormally
notpoweredrelays. If you wish to have the opposite
situation operate on the JP3 jump as follows:
pos. 1-2 normally powered relay
pos. 2-3 normally not powered relay
Remember that in pos. 2-3 the device power
comsumptionrisesfrom14 mA to 28 mA.
