A separate terminal block is provided via a ‘flying lead’ from the tamper
switch (housing lid removal detection device). As provided, the connections
to the changeover switch is of a solder made to the tags, suitable for the
security industry i.e. when the lid is secured a closed circuit is present at
the terminal block, going open circuit when the lid is removed. Should this
operation require to be reversed, then an alternative solder tag is provided
on the switch.
Note: the tamper switch operation should be tested prior to final
commissioning, and the switch adjusted as necessary to ensure false alarm
free operation. Adjustment can be made by applying gentle pressure to the
arm of the switch just above the switch contact point, and bending slightly
outwards as may be necessary.
To obtain the benefits of beam synchronisation as described previously, the
facility will only be in full operation when a hard-wired cable connection is
made between each beam set TX and its associated RX unit.
If the TX and RX of each set are powered from the same 12V DC power
supply, then only a single core cable / conductor is required between
terminal 3 (Sync. O/P) of the Transmitter (TX) and terminal 3 (Sync. I/P) of
its associated Receiver (RX).
Where the TX & RX units are powered via separate power supply units, it
is necessary to common the negative supply line of the PSU’s, or install
an additional core cable / conductor between the TX terminal 1 and its
associated RX terminal 1 (negative supply of TX & RX units).
If on a single beam set installation the synchronisation system is not desired,
then no interconnect between the TX and RX should be made, other than
possibly the 12VDC supply (TX & RX Term. 1 - & 2 +).
Note: In an unsynchronised system, the beam sets will operate even with
the TX and RX units powered from separate 12V DC power supply units
(PSU’s), and the 230 / 110 V input to the PSU’s powered via different mains
phases.
The ‘synchronous’ type synchronisation system is not covered within the
instructions. It is to be used under guidance from our tech. dept, who will
be pleased to discuss the connection requirements if in our view we deem
it applicable for the type of installation. Terminals applicable are:- TX term.
4 & 5 and RX term. 4. These terminals should not be used for any other
connections.
OPTICAL SIGHTING MODULE
The Optical Alignment module is designed to be placed upon the top of both
the transmitter (TX) & receiver (RX) GS100 ‘Optical Head’ to aid the process
of ‘initial alignment’.
optical sighting module (SAA1-16)
optical head of TX/RX Unit
sighting window (LEFT)
sighting window (RIGHT)
FINAL ALIGNMENT
This process aligns the beam path between the TX & RX for optimum
performance in all weather conditions.
It is simplified by the use of the mini strobe alignment tool (optional).
However, where not available the use of a standard voltmeter with 0 –
10VDC range is adequate in most instances.
Unlike the single man operation with the mini strobe, unless a drum of two-
core cable is available to temporarily run above ground between the TX &
RX units, final alignment will require a two-man operation.
Where a voltmeter and a drum of cable is available, the alignment voltage
information that is only available at the receiver (RX) unit, can now be
observed by the voltmeter at the transmitter unit, via connection to the temp.
run cable, that in turn is to be connected to the RX voltage alignment O/P. In
this manner the process can be carried out by a single man operation.
For alignment using the ‘Mini Strobe’ refer to accompanying instructions.
Set the voltmeter, to 10V DC range and connect negative probe to terminal
1 on the receiver (RX) unit (negative supply). Connect the positive probe to
terminal 5 on the receiver (RX) unit (Align O/P).
In addition to these terminals, alignment information is mimicked via the test
pins to the right of the termination block, and identified by ‘ALIGN + / 0v’.
If initial alignment has been carried out, the alarm LED (far right of RX
termination block) may be extinguished, and / or an alignment O/P voltage
may be present on the alignment O/P terminals. Even at this point, the beam
sets should be aligned for optimum performance.
With the meter connected, both the TX & RX optical heads must be adjusted
in both ‘pan’ & ‘tilt’ directions of movement, to achieve maximum alignment
voltage.
The actual alignment voltage achieved will depend on the distance
between the TX and RX unit, and as to whether the beam sets have been
synchronised via an interconnection cable.
For non- synchronised systems the maximum alignment voltage achievable
is generally 5 - 6V DC, whilst with a synchronised system, the voltage is
approximately halved to 2.5 – 3.0V DC max.
The beam sets are best aligned methodically, starting with trying to achieve
some alignment voltage whilst adjusting the receiver optics firstly in the pan
mode, and then in the tilt mode.
Repeat this procedure with the transmitter (TX) optics, until optimum
voltage O/P is achieved, and then back to the RX optics to see if any further
improvement can be made.
It is critical that alignment of the optical heads are carried out at each end
of the detection zone, i.e. both TX & RX optical heads are adjusted, and not
just the RX optical heads where the alignment voltage is made available.
The most critical optical head is that of the transmitter, as unless the
projected cone of energy is adjusted to fall on the receiver optics, no
adjustment at the receiver optics will produce an alignment O/P (receiver will
never pick up its associated transmitter signal).
FINAL TEST
An optional 70% or 90% attenuation filter is available, and can be inserted
in the beam path, in font of both the TX and RX optics. The filter will have
the effect of attenuating the beams signal strength by 70/90%, simulating the
effect of adverse weather conditions.
With the introduction of the filter into the correctly aligned beam set, the
receiver (RX) should not provide an alarm O/P. If an alarm is generated then
the alignment procedure should be repeated.
