Det-Tronics R7495D UV/IR Flame Detection System - Manual (Page 6)

2. The FIRE ZONE LEDs signal actuation of the corre-
sponding fire (timed) relay outputs.
3. Illumination of the ALARM LED indicates actuation
of an alarm (instant) relay output.
4. Illumination of the FAULT LED indicates a system
malfunction when in the the Normal mode, or that
the controller is in the Reset or Test mode.
5. The POWER LED is illuminated when power is
applied to the controller.
6. Pressing the RESET/LAMP TEST button illuminates
all LEDs for testing and resets the system. While
the button is depressed, the outputs are disabled.
This will cause a fault condition until the controller
restarts (approximately two seconds).
7. The TEST/NORM toggle switch selects Test or
Normal mode.
Normal Mode
Under normal operating conditions, the POWER LED is on
and all others are off. The alarm and fire relays are nor-
mally de-energized and the fault relay is normally ener-
gized. The LEDs can be tested periodically by pressing
the LAMP TEST pushbutton. It is not necessary for the
controller to be in the TEST mode when this test is being
performed, however, depressing the LAMP TEST push-
button will disable the outputs and reset the operating
program. After the pushbutton is released, a fault condi-
tion remains until reset is complete and the controller
restarts (i.e., the fault relay drops out for 2 seconds).
Resetting The Controller
Any existing system status indications and the controller
outputs are returned to normal operating condition with
all LEDs except the POWER LED off, and all relays
except the Fault relay de-energized (after the radiation
source is removed or the fault is corrected) in one of the
following ways:
1. Depress the RESET/LAMP TEST button.
2. Place the mode switch in the TEST position, then
return it to NORMAL.
3. Close the optional remote reset switch connected
between terminals 31 and 32.
Fire Response
Four output relays are provided for controlling fire
response devices. Two relays are designated as
“Alarm” and two as “Fire.” Alarm relays 1 and 2 are
directly controlled by detectors 1 and 2, respectively.
When either detector generates a fire signal that lasts
for two consecutive gates (regardless of the number of
gates that the controller has been programmed for):
— The ALARM LED flashes (approximately four times
per second).
— The corresponding alarm (instant) relay is ener-
gized.
— The corresponding DETECTOR LED flashes to iden-
tify the detector responding to flame.
When the signal from the detector meets all the pro-
grammed STAR logic requirements for a fire output, the
appropriate fire relay(s) will also be actuated.
The grouping of the detectors into Individual or
Combined fire zones determines whether the fire relays
are actuated individually or together. When the con-
troller is programmed for Individual fire zone operation,
each detector controls its corresponding fire relay.
When the controller is programmed for Combined fire
zone operation, a fire at either detector will cause both
fire relays to be energized simultaneously.
The FIRE ZONE LEDs flash to signal actuation of their
corresponding fire relay.
If the controller is programmed for latching outputs:
— The DETECTOR LEDs flash while the signal thresh-
old requirements are met (fire being detected) and
are on steady after the fire is no longer detected.
— The relays remain energized until the fire is extin-
guished and the controller is reset.
If the controller is programmed for non-latching opera-
tion:
— The LEDs flash and the output relays are actuated
only while the fire signal exceeds the minimum
threshold requirements (2 consecutive gates for
alarm, the programmed number of gates for fire out-
put). When the threshold requirements are no
longer met, the LEDs are on steady until the con-
troller is reset.
Fault Detection
The Automatic oi feature continuously checks the
cleanliness of the detector viewing windows and the
sensitivity of the sensors. In addition, automatic diag-
nostic circuitry in the controller monitors the system for
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