User guide

EDS - RK90R - OPTICAL BEAM SMOKE DETECTOR - USER GUIDE
12
8 - SETUP OF THE OBSCURATION CIRCUIT
Electric signal setup must be performed according to the following sequence:
8.1 - do not power up the TX and the RX
8.2 - on the Transmitter (TX) rotate the selector SW3 in one of the positions 1-2-3-4 (fig.10) according
to the distance between TX and RX with reference to fig.7
8.3 - power up the TX and don’t mount the cover. The red led of the TX will pulse every 10 seconds
8.4 - on the Receiver (RX) move the alignment jumper JP1 (fig.9) in the position ON (Alignment) to
activate the initial setup operation mode
8.5 - power up the Receiver
8.6 - the blue led and the red one will start working in the way described ahead in chap. 8.13. Before
going on to this chapter read what’s following
8.7 - the P1 trimmer (regulation of the signal level) is factory preset to the 50-60% and it corresponds
to a signal of 5V at the maximum distance
8.8 - to get the best results in the following operations, we recommend the use a measuring instrument
(Multimeter), preferably an analog hand type, for better control of the variations of the signal during
the setup.
Good results are also obtained using analogical STS01 (optional), designed for this application, that
must be inserted on the special connector CN4, set on the printed circuit of the detector (v. fig. 11).
If you don’t have a Multimeter or the STS01, you can perform the setup operations anyway evaluating
the signal level with the frontal Leds indications as described in chap.8.13
8.9 - if available, connect a 5V fullscale multimeter between the SIG terminal and the negative power
supply one and read the analog output signal. Instead of the multimeter it is possible to use the STS01
meter (optional - fig. 11).
If the output signal is very low it means that the operations of optical alignment described in chapter 5
have not been performed in the right way and therefore must be repeated
8.10 - the Transmitter emits a conic beam which form and dimension, in relation with the distance
between TX and RX, are explained in figures 5 -6.
It’s important that the Receiver is in the center of the Transmitter conic beam because, under these
conditions, even if some small movements of the wall on which the transmmietter is mounted on
happen (caused by deformations), the reflector remains always within the beam and therefore active.
To obtain this, the operations of fine centering with output signal measuring, explained below,
must be performed with care.
8.11 - adjust the signal around 3V acting on the trimmer P1 (fig.9)