Det-Tronics C7052J UV/IR Flame Detector used with R7494, R7495 Controller - Manual (Page 4)

1. A DETECTOR LED for each channel provides an
immediate visual indication that a fire has been
detected. The LED blinks slowly (once per second)
if the fire intensity does not exceed the fire thresh-
old and blinks rapidly if a fire output is generated.
Steady illumination indicates that the fire intensity
has returned below the alarm threshold (i.e., fire has
been extinguished).
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 (in Normal mode).
5. The POWER LED is illuminated when power is
applied to the system.
6. The RESET/LAMP TEST button illuminates all LEDs
for testing and also 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).
11. The TEST/NORM toggle switch selects NORMAL or
TEST mode.
Normal Mode
In the Normal operating mode, the R7495B Controller
monitors the outputs of all detectors connected to it and
compares the detector output signals to field adjusted
settings (refer to the “STAR Logic Programming” proce-
dure in the “Programming the Controller” section) to
determine whether a fire condition exists. Diagnostic
circuitry continuously checks the system for wiring con-
tinuity as well as faults that could prevent proper
response to a fire through the Automatic
oi feature. The
Fire Zone (timed) and Alarm (instant) relays are normally
de-energized. The Fault relay is normally energized, as
long as no system malfunctions are detected. Only the
POWER LED is illuminated.
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-energize (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.
Programming Switches
Rocker switches that are located on the side of the con-
troller are used for selecting various options available
with the R7495B. These programming options are listed
below and must be set prior to system operation. Refer
to the “Programming the Controller” section of this man-
ual for detailed instructions.
1. Number of detectors connected to the controller (up
to eight)
2. Gate Length, Consecutive Gate Selection, Count
Selection (system sensitivity and time delay).
3. Detector Grouping/Voting Logic
4. Latching/non-latching outputs.
Detector Grouping
The microprocessor-based circuitry in the controller
requires that the detectors be “grouped” into detection
zones. Two options are possible:
Separate - Two independent groups consisting of up to
four detectors each (channels 1 to 4 and channels 5 to
8) can energize an Alarm and a Fire Zone output.
Combined - All eight channels make up a single detec-
tion zone, with both Alarm outputs and/or both Fire Zone
outputs being actuated simultaneously.
Alarm Outputs
Two Alarm relays are provided for controlling external
fire response devices. If any of the detectors in the
group detects a fire that exceeds the gate length, con-
secutive gates, and count selection requirements.
1. One or both of the Alarm relays is energized.
2. Actuation of an Alarm relay is indicated by illumina-
tion of the ALARM LED on the front panel of the
controller.
3. The detector(s) responding to fire is identified by
illumination of its corresponding DETECTOR LED.
Fire Zone Outputs - If the combination of detectors
responding to fire satisfies the pre-programmed voting
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