Omniguard 760 series, Инструкция по установке и эксплуатации, Страница: 12 / 16

12 ©Firefly AB (Oktober 2016)
condition, toggle the option on the USI “OFF” and reset the detector by
toggling the power off then on . If the fault condition continues to be
activated, then the problem is in a different section .
Note: If the Model 760 is placed near a grey body source with the
equivalence of the object being at a minimum temperature of 150°F
(65°C) from a distance of 22 in . [55 .9 cm] and if one of the IR sensor
window is blocked while the other one remains unblocked then the
Amber LED will flash at the rate of 4 Hz until the blockage is removed
from the window’s viewing area . This will be an indication of a Block
Fault
Model 760 Flame Detectors are equipped with automatic self-test
in addition to the manual test . Approximately every 15 minutes
the automatic self-test is actuated, and for a brief time interval, the
optics and electronics are checked for functionality . A failure of
the automatic self-test is annunciated by the activation of the Fault
Outputs . If a detector goes into a fault condition, the optical surfaces
should be checked for cleanliness . Clean sensor windows and light
guide ends are necessary for the detector(s) to pass self-test .
After the optical surfaces have been inspected and cleaned, reset
the detector . If the detector is wired for manual test, perform the
manual test . The typical response time should be to approximately 0 .6
seconds beyond the actual fire output time delay .
*WARNING* During Manual Test, the fire outputs will be actuated .
Always disable fire suppression and alarm systems before testing .
If the detector continues to go into a fault condition following a
cleaning of the optical surfaces, check the supply voltage and wiring
at terminals 8 or 9 and 10 or 11 . Look for loose or intermittent
connections .
During normal operation, the fault outputs will change state on
power-up . The output will return to its original state if power to the
detector is removed . If the fault output is intermittent or erratic, check
the supply voltage and wiring to terminals 8 or 9 and 10 or 11 . Inspect
the fault relay wiring on the detectors . Repair or tighten any loose
connections .
If the Warning option is “ON”, the fault relay will be flashing at a 1 Hz
rate whenever a fault conditions exists .
Manual Test Failure:
*WARNING* This will activate the fire outputs . Always disable
extinguishing circuits before testing .
A manual test is activated by connecting the test circuit terminal 12 to
the plus terminal of the detector’s input power supply (terminal 8 or 9) .
During manual test, the optical and electronic systems of detector are
checked . Upon successful completion of the test, the fire outputs will
be activated . Also, the red LED inside the detector, visible through the
LED window, will turn “ON” . The typical response time is 0 .6 seconds
beyond the actual fire output time delay . If the detector fails to
respond to a manual test, check to see if the USI manual test option is
“ON” (switch position 1) .
If the detector fails manual test and activates the fault outputs or if
the response time is longer than expected, the optical surfaces of the
detector may require cleaning . Clean the sensor windows and light
guide ends . After cleaning, initiate the manual test .
If the detector again fails manual test, check the wiring to the supply
voltage terminals 8 or 9 and 10 or 11 . The detector may not be
receiving enough power; the wiring connections may be loose or
intermittent . If the red LED is illuminated and there is no fire output,
then check all connections to the fire alarm panel or annunciating
devices . A defective test switch may prevent the test circuit from
initializing . Initiate the manual test by connecting a wire from the
test switch terminals to the positive terminal of the input power
supply . Replace the switch if the manual test operates when the wire
is connected .
Warning:
In addition to detecting fire, the Omniguard® 760 Series Flame
Detector will annunciate a warning of potentially hazardous
conditions that could cause a fire .
When the detector senses a persistent source of infrared radiation
from heat sources the Warning Outputs will change state . To enable
the Warning Outputs for the relay, the Warning option (switch position
5) must be “ON” . When the Warning Outputs are activated, it will cause
the fault relay to be “OFF” and the amber LED to be “ON” constantly .
If the 0 to 20 mA is “ON”, it will set the output to 16 mA for the Fire
IR Warning and 15 mA for the Reference IR Warning . The Warning
Outputs are non-latching and will change states if the problem source
is removed .
This Warning alarm is used as a tool to help prevent unwanted Fire
alarms . By identifying problem heat sources in the detector’s field-
of-view and making appropriate changes, i .e . shielding or re-aiming
of the detector, potential false fire alarms can be avoided . A Warning
should always be investigated with caution . Inspect the protected
area . If no radiation sources are apparent, cover the detector with
opaque material to test whether the Warning disappears when the
sensor windows are blocked . If the Warning does not disappear after
blocking the windows, a sensor channel may be faulty and in need of
repair .
RS485 User Interface (UI)
If no communication has been established, check the wiring to be sure
that the polarity is not reversed on the two wires . The network can
be daisy chained, but it does require two 120Ω terminating resistors
in order to minimize reflections . One resistor should be placed at the
network controller or master device . The other resistor should be
placed at the farthest location from the network controller or master
device . RS485 allows up to 4000 feet or 24 AWG twisted-pair wire
driving into 120Ω loads . Line polarization should be implemented at
the network controller or master device .
Service and repair
Contact Firefly AB or your Firefly AB distributor for details on our
customer support and repair services . Prior to returning defective
material, please contact the Firefly AB service and repair department
for additional procedural information .
Omniguard® 760 Series Flame Detectors are not field-serviceable
and the flameproof joints are not intended to be repaired . . An
unauthorized attempt to repair or re-calibrate a detector will void the
warranty .
Detectors should be carefully packaged to avoid damage from shock,
moisture and dust . When shipping detectors back to Firefly AB,
use the original shipping carton, if available . If the original packing
material is not available, wrap the detector in plastic and ample
packing material to cushion the detector .
Warranty
The warranty period is thirty-six (36) months for the Omniguard®
760 Series Flame Detectors and five (5) years for the IR Sensors .
Firefly AB will, at its option, repair and return without charge (freight
prepaid) any Omniguard® product, used in accordance with Firefly AB
ratings and instructions and confirmed by Firefly AB to be defective
in workmanship or materials . This warranty shall be valid only if
the product is returned, within the applicable warranty period, to
the factory at Stockholm, Sweden properly packed and with all
transportation charges prepaid .
All warranty periods commence from the date the product is shipped
to the end user, provided that delivery is within six (6) months of the
date the product was originally shipped from the factory . There are
no warranties of merchantability, fitness, or implied warranties of any
kind, or representations for any other Firefly AB product, except the
warranty specified herein . In no event shall Firefly AB be liable for any
consequential, special, or other damages attributable to our product .
The buyer is solely responsible for the proper installation, maintenance
and use of the Omniguard® Flame Detectors, and agrees Firefly AB
is not in any way liable for any special incidental or consequential
damages whatsoever .