Det-Tronics Eagle Quantum 95-8470-05, Инструкция по эксплуатации

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IV-2
Output
The output of the device is a status message that is sent
to the gateway and logic controller in the Local Control
Unit along the communication loop. System response
to the message is determined at the time of
configuration. The UV detector supports ANSI/NFPA 72
Class A, Style 7 communication with the LCU.
A Standard Periodic Report (SPR) is sent to the gateway
at the rate determined at the time of configuration.
When programmed for response to a fire alarm
condition, a special Acknowledged Exception Report
(AER) is immediately sent to the Logic Controller.
Addressability
Device identification is accomplished by setting
switches on an eight position DIP switch (valid address
range is 5 to 250).
Alarm Log
Each detector maintains an alarm log in non-volatile
memory. The time and date for the last eight alarms are
logged.
Terminal Wiring Board
All external wiring is connected to screw terminal
connectors on the terminal wiring board located inside
the detector housing.
Enclosure
The explosion-proof NEMA/Type 4X enclosure is
designed for use in a variety of hazardous locations.
SOFTWARE SELECTABLE OPTIONS
The following software selectable options are available
through a PC running Det-Tronics configuration
software.
Operating Mode
The operating mode determines the type of logic that
the UV flame detector will use for processing fire signals
(either standard or arc rejection).
ARC REJECTION MODE
The arc rejection mode (recommended) enables the
detector to prevent nuisance fire alarms caused by UV
from short-duration electrical arcs or electrostatic
discharge, while maintaining the ability to reliably detect
the UV given off by a flame. The arc rejection mode is
not recommended unless these false alarm sources are
present within the application to be protected. Typical
applications that benefit from arc rejection logic include
electrostatic coating processes and uncontrolled
environments where transient UV sources can be
present, such as many typical outdoor applications.
STANDARD MODE
In the standard processing mode, the detector output
(measured in counts per second) is compared to the
fire threshold (the “sensitivity” setting as described
below). If the radiant energy level from the fire exceeds
the selected alarm threshold level, the time delay
begins (if a time delay is selected). If the radiant energy
level from the fire remains above the selected sensitivity
level for the duration of the time delay, the fire alarm
output is activated. In every application, it is crucial to
ensure that the radiant ultraviolet energy level from the
expected fire at the required distance from the detector
will exceed the selected sensitivity level.
Standard signal processing is recommended for
controlled indoor applications only.
The arc rejection algorithm examines the radiant energy
level detected within a specified unit of time (timed
gate). Detector output is determined by three variables:
— sensitivity level
— gate length
— number of consecutive gates required.
T0005A
Status LEDs
Normal with automatic oi selected Blink every 5 seconds
Normal with manual oi selected Blink every 10 seconds
Fault (General) Off
Power supply fault Off
oi fault Off
UV being detected, but time delay not yet satisfied LEDs continue blinking
Fire On
Table IV–1—EQ2200UV Detector Status/Indications