Fire Fighting Enterprises FIRERAY 2000 EExd - Manual (Page 6)

Page 6 of 12
screws, between the Receiver Case and the mounting surface. (Some applications may require
fabrication of angled mounting brackets etc, in order to cope with awkward wall positions etc. These
are not supplied).
Install all required cabling to the defined positions for each system part. (See wiring diagram on
following page, for a typical installation). Ensure compliance with all regulatory and local requirements
for Hazardous Areas and Fire Alarm Systems. Approved screened cables and approved EExd glands
and termination methods must be used. Glands at the Controller, Rx and Tx must be metal EExd types.
The Cable screens or jackets must be terminated properly at the glands, with a 360

termination. Screen
Pigtails must not be used.
Mount the Receiver first, such that it faces, and has un-obstructed line of sight with the expected final
Transmitter position. Remove the Receiver housing top (using 5mm Allen key provided). Connect the
system cabling to the 3 way terminal block on the internal pcb. It is recommended that the External
Earth point be used on the Tx and Rx housings, to minimise wiring lengths. This must be taken to the
nearest suitable building Earth point. Alternatively, the housing’s Internal Earth stud may be connected,
via an additional cable core and connected back at the Control Unit Earth. (see wiring diagram on the
following page for connections and earthing regimes). Check the connections and tighten the cable
glands, then refit the housing top, taking care to position the ‘O’ ring seal correctly, just below the
flange. Tighten the 4 securing screws firmly. For safety reasons, and to give the best EMI rejection,
do not omit any of the Earth connections.
Fit the Transmitter head in a position which aligns as closely as possible with the Receiver line of sight,
making use of the adjustment bracket provided. A 12mm AF spanner/wrench is required for the
adjustment bolts. Remove the Transmitter housing top (using 5mm Allen key provided) and set the
Range Switch to the correct or next higher setting, to match the expected operating range. Use a biro tip
to set the switches. The switches are ‘ON’ when moved outward, and ‘OFF’ when moved inward,
toward the housing centre. Note that only one setting must be selected ‘ON’. Connect the system
cabling to the 3 way terminal block on the internal pcb and Earth the unit housing in the same manner
as used for the Rx (see wiring diagram on the following page for connections and earthing regimes).
Check the connections and tighten the cable glands, then refit the housing top, taking care to position
the ‘O’ ring seal correctly, just below the flange. Tighten the 4 securing screws firmly. For safety
reasons, and to give the best EMI rejection, do not omit any of the Earth connections.
Install and wire the Controller unit in it’s defined position, outside the hazardous area. Set the unit’s
Alarm threshold to 25%, 35% or 50%. Only close one switch position, for the desired threshold. Set
the ‘ALARM LATCH’ switch as required. Switch Closed = latching Fire Alarm operation. For UK
installations, leave the ‘COMP’ switch open (Sets AGC operation at compensation limit - See
functional descriptions on page 2).
Check all wiring then apply power to all parts of the system.
At the Controller Unit, Set the Reset Switch to ‘ON’, and the Gain Control knob to approx midway.
Connect a length of two core bell wire or similar to the Metering terminals in the Control Unit. Run this
temporarily to the Transmitter position and connect a dc voltmeter to the ends. Set the voltmeter to
read up to 10Vdc or ‘autorange’.
Whilst observing the meter reading, adjust the Transmitter-to-Receiver alignment to achieve the highest
reading possible. A reading of at least 4.1Vdc is required for correct function (Note : <=2.7Vdc = no
signal). On completion, lock the transmitter adjustment bracket and all mountings securely, checking
the alignment on the meter whilst doing so. Remove the temporary meter wiring on completion.
Return to the Controller Unit and observe the Green lamps either side of the Gain Control. Adjust the
Gain Control such that the two lamps both extinguish completely.
Set the Controller unit’s Reset Switch to ‘OFF’, observe that the yellow FAULT lamp extinguishes,
then wait at least 50 seconds while the system calibrates. After 50 seconds, check that the FAULT lamp
is still extinguished. The system is now armed and active.