Det-Tronics C7051B, C UV Flame Detector - Manual (Page 23)

1. Place the keylock switch in the NORMAL position.
2. Turn on W8066 UV Test Lamp or an equivalent UV
source and shine into any fire detector.
3. If system works correctly, the appropriate ZONE
OUTPUT LED turns on and flashes, indicating the
zone in which the detector is located. ZONE dis-
play shows first zone activated. STATUS display
shows a “6”.
4. The FIRE LOGIC LEDs turn on if voting require-
ments are met.
5. Turn off the UV source.
6. FIRE LOGIC LEDs stay on if turned on in step 4.
7. The ZONE OUTPUT LED stays on but stops flash-
ing. The numeral indicating the first zone that
responded to the UV signal is held in the ZONE
display, and the numeral “6” remains in the STATUS
display.
8. Repeat steps 2 through 5 for each detector in the
system.
9. After all detectors have been checked, reset the
system by turning the keylock switch to the RESET
position. Then turn it to the NORMAL position.
Display turns off. INHIBIT LED turns off. FAULT
LED turns off.
10. Restore power to output loads or remove any
mechanical blocking devices.
TROUBLESHOOTING
The Automatic Fault Identification circuitry, in conjunction
with the Automatic
oi feature, continuously monitors the
status of the controller and all detectors. In the event of
a system malfunction, the microprocessor immediately
branches to an automatic fault identification program. If
a fault occurs, the FAULT LED will turn on. If the fault is
in the detector or wiring, the ZONE display will indicate
which zone has the fault. The STATUS display will indi-
cate by code number the type of fault. If the fault is in
the microprocessor circuitry, the displays will remain
blank but the FAULT LED will turn on. See Table 5 for a
detailed explanation of the status/fault code numbers on
the lower digital display and the corresponding identifi-
cation numbers on the upper digital display.
NOTE
Record all faults on the Fault Record Sheet at the
back of this manual.
VOLTAGES AND WAVEFORMS TO AID IN
TROUBLESHOOTING
A-lead (terminal 3) to circuit ground: +290 vdc.
D-lead (terminals 12 through 19) to A-lead: less than 1
volt.
Do not check in normal mode. System must be in test
mode to prevent false actuation. In the test mode, man-
ual
oi operation can be verified by observing the voltage
between the D-lead and circuit ground.
Due to the meter “loading” factor, the voltage from the D-
lead to ground measures approximately +260 vdc.
When the test button is depressed (in test mode) the volt-
age on the D-lead of the detector under test drops to 0.5
vdc or less (see Figure 20).
B-lead (terminals 4 through 11): The manual oi test
causes the detector to send a series of voltage pulses to
the controller. The waveform on the B-lead of the detec-
tor under test is illustrated in Figure 21.
SOLID STATE INPUT AND OUTPUT CIRCUITRY
Figures 22 and 23 illustrate the input and output drive cir-
cuitry of the R7404 Controller.
ORDERING INFORMATION
When ordering specify:
Model R7404 Fire Protection and Nuclear Surveillance
Controller
Model C7051 Detector
Number of C7051 Detectors and R7404 Controllers
ACCESSORIES
— Q4004 Mounting Cage. Cage accommodates up
to eight modules. It is designed to fit a standard 19
inch instrument rack. See form 95-8241 for details.
— Filler panels (part number 002188-001). For empty
positions in the Q4004 Cage.
— W8066 Explosion-proof, portable UV Test Lamp.
See form 95-8345 for details.
— Matched pair, DE1888G2 sensor tubes (part num-
ber 003240-207), for replacement into C7051
Detector.
21 95-8256