Fire Fighting Enterprises FIRERAY 2000 EExd - Manual (Page 4)

Page 4 of 12
Two possible actions are selectable, once the system has exhausted all compensation steps, as follows:-

Leave the COMP switch in the Controller unit OPEN for BS5839 installations (UK). This
setting allows generation of a FIRE ALARM after reaching the compensation limit, even
though a FAULT ALARM will be active. This is the only time Fire and Fault indications can
occur together.

Close the COMP switch if it is required that FIRE ALARM generation is inhibited once a
FAULT ALARM has occurred, due to reaching compensation limit.
Controller Unit - Relay Outputs
The Controller Unit has two sets of outputs for Fire and Fault indication, in the form of voltage free
single pole changeover relay contacts. The FIRE relay may be set to give either latching or non-latching
operation, determined by a switch (ALARM LATCH) on the Controller pcb. With the switch closed,
latching operation is selected.
Controller Unit - Signal Strength Metering
A ‘Metering ‘ output is also provided, to assist with installation. This gives a dc voltage which is
proportional to the received signal strength and can be monitored using a voltmeter.
Controller Unit - System Resetting
The system can be reset in any of three ways, as follows :-

Using the RESET switch in the Controller Unit (Normally only used during installation).

By taking the External Reset input low (to system 0V) for at least 5mS.

By de-powering the system for 1 second, then re-powering.
Following a reset the system takes 50 seconds to self-calibrate. During this time the Fireray adjusts it’s
100% signal reference level and so must have a clear unobstructed beam. No tests should be carried out
until this initialisation period has elapsed.
Notes On Resetting Using The Internal RESET Switch
Note that for correct operation, the internal RESET switch must not be set to OFF whilst either of
the HIGH or LOW signal lamps in the Controller Unit are illuminated. The gain must be set
correctly to extinguish both lamps first. If this is not done the system AGC is locked and will not
operate. (This does not apply to the other two reset methods).
SUMMARY OF SYSTEM CONDITIONS :-
Possible Causes of FAULT Alarms

Controller Unit RESET switch in ON position.

Controller Unit EXTERNAL RESET input active ( at 0V)

No power to Controller unit

No Power to Tx unit

Beam obscuration >93% for >5 seconds (for whatever reason)

Tx or Controller power cable break.

Receiver Signal cable break.

AGC at limit of compensation.

Rx/Tx Mis-alignment causing low signal strength

System unable to initialise following reset, due to inability to calibrate correctly (perhaps caused by
interference or testing of the beam before expiry of the 50 second calibration period.
 High or Low signal when Controller Unit’s RESET switch set to OFF (AGC locked out).
Possible Causes Of FIRE Alarms

In normal use, beam strength reduced by more than the set threshold (Smoke in beam).