The following guidelines are intended to assist with the electrical design and engineering of
systems where it is intended that flame detectors will be used.
4.1
It is important to ensure that the system is correctly connected to earth. Incorrect or poor
earthing can adversely affect system operation and may result in poor video image quality.
The detector enclosure is to be connected to a local earth and the detector cable screens (shields)
should be cut back to the crotch and not terminated within the detector. If the detector enclosure
cannot be connected to a local earth then care should be taken to ensure the cable armour braid
provides a suitable earth or that the enclosure earth stud (external) is separately connected to a
suitable earth point using a single core 4mm2 earth cable.
All detector cable screens should be connected to the local clean earth at the control panel. The
screens (and twisted pairs) should be maintained to within 1” (25.4mm) of the terminations at the
detector, within all junction boxes and at the control panel. Where unscreened cables are used
for panel wiring, then all cables must be suitably twisted into pairs and video cables should be
segregated from other signal sources.
4.2
The detector requires an absolute minimum supply voltage of 18V, as measured at the detector
terminals. The system power supply voltage and power distribution should be arranged such
that on the longest cable run the detector(s) has a supply voltage of greater than 18V.
4.3
RS485 communications can be accessed either directly via the detector specific terminals, or as
previously stated, via terminals A&B (3&4) whilst the power supply polarity is reversed. Using
Micro
s software, the RS485 channel can be used to view and/or modif
firmware, version, configuration or download recorded alarm video from SD card. Contact
Micropack for Simple Apps software.
micro
FDS301 Flame Detector FDS301 Safety and Technical Manual
17
Ref: 2200.5009 Rev: 2.3 ECN 4434
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