Sigma_XT_signs_m3.5.docx
Page 3 of 14
1.
Introduction
SIGNS
- The illuminated warning signs provide a clear, visual and audible warning for a fire alarm,
extinguishant release, and System inoperative. Signs have two levels of operation in which the top and bottom
halves of the sign may be split to show an initial warning and then additional text for a reinforced warning, or
both halves can be activated at once.
LOCAL CONTROL STATION
(LCS) may be required by standards for an installation. These units can be installed
using the serial bus and can be inserted anywhere in the 485 circuit.
A maximum of 7 devices (signs/LCS) can be installed when utilising the 485 Circuit.
Sign Locations
Locations where signs must be installed are defined by AS 1670. This manual does not replace reading the full
standard. Signs should be firmly mounted in appropriate locations. Interior signs are rated IP30 and are designed
for indoor use only. Weatherproof Signs are available. Signs are considered by the Sigma XT FIP to be OUTPUT
UNIT(S)
“FIRE ALARM/DO NOT ENTER” SIGNS
- Installed outside the risk area, adjacent to all egress points and clearly
visible to anyone who may enter the risk area.
“FIRE ALARM/EVACUATE AREA” SIGNS
- Installed inside the risk area, adjacent to all egress points and clearly
visible to all occupants of the risk area.
“EXTINGUISHING SYSTEM INOPERATIVE” SIGNS
- Installed adjacent to the FIP and egress points, with additional
signs where necessary to be clearly visible to anyone who enters the risk area.
Local Control Stations (LCS)
LCS should be mounted firmly in an accessible location. The LCS is considered by the Sigma XT FIP to be a STATUS
UNIT(S). Status units have monitored inputs to which remote Hold or Mode select switches can be connected.
These inputs are monitored for open and short circuit faults and therefore need to have a 470R 1W trigger
resistor connected in series with the activating, normally open switches and 6K8 0.5W end of line monitoring
resistors connected across the end of the cables.
Status Units are environmental class A and are designed for indoor use only at temperatures between -5
0
C (+/- 3)
and +40
0
C (+/- 2) and with a maximum relative humidity of 95%. The IP rating for the enclosure is IP30. Operation
outside of these limits may render the equipment unsafe.
The 6K8 end-of-line monitoring resistors are supplied fitted to the Hold and Mode input terminals
External Devices
In addition to standard installation rules, there are some additional precautions that must be observed when
installing external signs.
SUNLIGHT - If an external sign is mounted in direct sunlight, it may be difficult to see if the sign is illuminated. In
this case it may be necessary to install a sun shield to make the illuminated sign visible.
DRIP LOOP - All external devices should be installed with cable penetrations coming through the bottom of the
sign, with a drip loop included to avoid the accumulation and ingress of water that may damage the electronics.
Cable Penetrations and Terminations
All cable penetrations into the sign enclosures must be protected by cable glands or bushings. Each sign enclosure
features a series of 20mm knockouts to accommodate these cable glands. The max size of cable that the
terminals will accommodate is 2.5mm.
When preparing cable terminations, ensure that cables are not going to cross the front surface of the circuit board
as this will impair the light output of the unit, and the shadows generated by the cables will be clearly visible when
the sign is lit.
