_______________________________________________________________________________________________________________________________
European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: +44 (0)208 743 8880
www.e-2-s.com Fax: +44 (0)208 740 4200
Document No. IS 2491-P Issue C 18-03-10 Sheet 3 of 4 (3)
When using the internal earth terminal ensure that the
stainless steel M4 flat washer is between the incoming earth
wire and the enclosure.
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.
12)
Cable Glands
The BExH120D Hootronic sounder has 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 EN60079-14:2008 / IEC60079-14:2007.
SAFETY WARNING: If the BExH120D sounder is used at
high ambient temperatures, i.e. over +40ºC, then the cable
entry temperature may 70ºC and therefore suitable
heat resisting cable glands must be used, with a rated service
temperature of at least 110ºC.
If a high IP (Ingress Protection) rating is required then a
suitable sealing washer must be fitted under the cable gland.
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.
13)
Cable Connections
The cable connections are made into the terminal blocks on
the electronic pcb assembly located in the flameproof
enclosure. See section 8 of this manual for access to the
flameproof enclosure. On the AC units a two-way terminal
block is provided for the live and neutral mains supply wires
and a four way terminal block is provided for linking the Stop
and the second and third stages, (see figure 5). On the DC
units a five way terminal block is provided for +ve and –ve
supply input and second and third stage and the Stop modes
of operation, (see figure 4).
+
-
2
3
S
top
1
2
3
S2
S3
Stop +
ve
-ve
A single wire with a cross sectional area of up to 4mm² can
be connected to each terminal way or if an input and output
wire is required two 2.5mm² wires can be connected to each
terminal way. When connecting wires to the terminals great
care should be taken to dress the wire so that when the cover
is inserted into the chamber the wires do not exert excess
pressure on the terminal blocks. This is particularly important
when using cables with large cross sectional areas such as
2.5mm² and above.
N
L
-
2
3 S
top
1
2
3
14)
Sound Selection
The BExH120D Hootronic sounder has 5 different traditional
sounds that can be selected for the first stage alarm. The
sounders can then be switched to sound second and third
stage alarm sounds. The sounds are selected by pin headers
on the pcb for both DC and AC units. The sound table on
page four shows the pin header positions for the 5 sounds
and which sounds are available for the second and third
stages.
The BExH120D Hootronic sounder has the facility to replicate
the “tail off” traditionally associated with these sounds when
generated by electro-mechanical devices. The switching is
achieved using the “Stop” terminal (see section 15).
15)
Stop and 2nd & 3rd Stage Alarm Sound Selection
The operation of the second and third stages is different for
DC and AC units.
DC Units Second and Third Stage Sound Selection
The BExH120D Hootronic DC sounder has the facility to use
either +ve or –ve switching to change the sound to the
second and third stages. For –ve switching connect the two
headers on the pcb to the left-hand (marked –ve) and centre
pins. For +ve switching connect the headers to the right hand
(ve) and the centre pins. To change to the second
stage sound, connect either a -ve or +ve supply line to
terminal S2, depending on which switching mode is being
used while maintaining the dc supply to the +ve and –ve
terminals. Similarly for the third stage sound, connect a -ve or
+ve supply line to terminal S3. The supply to the S3 terminal
will automatically override a supply to the S2 terminal.
Figure 4
Figure 5
BExH120D DC Sounder
BExH120D AC Sounder
Volume Control
DC Terminals
Sound Headers
Volume Control
Stage Terminals
AC Terminals
Stage Headers
Stage Headers
