E2S BExBG05D Manual De Instrucciones página 6

8) Power Supply Selection
The system power supply must have the necessary capacity
to provide the input current to all of the beacons connected to
the system.
The following table shows the input current taken by the
various units:-
Unit Type Nominal I/P
Voltage
BExBG05D 12V DC
BExBG05D 24V DC
BExBG05D 48V DC
BExBG05D 230V AC
BExBG05D 115V AC
The above table also shows the maximum voltages at which
the beacons can be operated.
9) Cable Selection
Cables must be capable of handling the current drawn from
all of the units on the line.
SAFETY WARNING: If the BExBG05D beacons are used at
high ambient temperatures, i.e. over +40ºC, then the cable
entry temperature may exceed +70ºC and therefore suitable
heat resisting cables must be used, with a rated service
temperature of at least 95ºC.
10) Earthing
Both AC and DC beacon units must be connected to a good
quality earth. The units are provided with internal and
external earthing terminals which are both located on the
terminal chamber section of the unit (see figures 2 and 3).
When using the external earth terminal a cable crimp lug
must be used. The cable lug should be located between the
two M5 stainless steel flat washers. The M5 stainless steel
spring washer must be fixed between the outer flat washer
and the M5 stainless steel nut to ensure that the cable lug is
secured against loosening and twisting.
The internal earth bonding wire ensures that a good quality
earth is maintained between the flameproof chamber casting
and the flameproof cover casting.
11) Cable Glands
The BExBG05D beacons have dual cable gland entries which
have an M20 x1.5 entry thread as standard. Only cable
glands approved for Ex 'd' applications can be used, which
must be suitable for the type of cable being used and also
meet the requirements of the Ex 'd' flameproof installation
standard BS EN 60079-14 : 1997.
When only one cable entry is used the other one must be
closed with an Ex 'd' flameproof blanking plug, which must be
suitably approved for the installation requirements.
For combustible dust applications, the cable entry device and
blanking elements shall be in type of explosion protection
increased safety "e" or flameproof enclosure "d" and shall
have an IP 6X rating according to EN 60529.
_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH
Document No. BExBG05D (Gas-Dust) English
Input Max.
Current I/P Volts
750mA 15V
300mA 30V
180mA 58V
55mA 253V
140mA 126V
Issue B (Four Sheets)
SAFETY WARNING: If the BExBG05D beacons are used at
high ambient temperatures, i.e. over +40ºC, then the cable
entry temperature may exceed +70ºC and therefore suitable
heat resisting cable glands must be used, with a rated service
temperature of at least 95ºC.
12) Cable Connections
See drawings C and D / wiring diagram E
13) Synchronised Operation
All BExBG05D beacons that are connected to the same
supply line will have a synchronised flash rate at one flash
every second. To ensure that the units will be synchronised
check that the pin header is not fitted, i.e. the two header pins
are not shorted together (see Figure 4).
14) Flip-Flop Operation
Two beacons can be mounted close to each other to form a
flip-flop operation, where the beacons will flash alternately.
To achieve this mode of operation, fit a pin header to the flip-
flop header pins on the electronics board, i.e. the two header
pins are shorted together, (see figure 4) on one of the two
beacons. The first flash on the beacon that has the header
fitted will be delayed by ½ second. The two beacons will then
flash alternately every ½ a second.
15) End of Line Monitoring (DC Units)
On the BExBG05D DC beacons, dc reverse line monitoring
can be used if required. All DC beacons have a blocking
diode fitted in their supply input lines. An end of line
monitoring diode or an end of line monitoring resistor can be
connected across the +ve and –ve terminals. If an end of line
resistor is used it must have a minimum resistance value of
3k3 ohms and a minimum wattage of 0.5 watts or a minimum
resistance value of 500 ohms and a minimum wattage of 2
watts.
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