__________________________________________________________________________________________________________________________________
European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: +44 (0)20 8743 8880
www.e-2-s.com Fax: +44 (0)20 8740 4200
Document No. IS 2457-P Issue E 12-03-10 Sheet 3 of 4
9)
Cable Selection
When selecting the cable size consideration must be given to
the input current that each unit draws (see table above), and
the length of the cable runs.
SAFETY WARNING: If the high output BExDTS110D units 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 110ºC.
10)
Earthing
The Sontel 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 internal earth terminal ensure that the
stainless steel M4 flat washer is between the incoming earth
wire and the enclosure.
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.
11)
Cable Glands
The BExDTS110D Sontels have dual cable gland entries
which have an M20 x 1.5 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.
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.
SAFETY WARNING: If the BExDTS110D Sontels 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 110ºC.
12)
Cable Connections
The cable connections are made into the terminal blocks on
the Sontel pcb assembly located in the flameproof enclosure.
See section 7 of this manual for access to the flameproof
enclosure. The printed circuit board has two terminal blocks;
one for the power supply input voltage and one for the
telephone signal input cable (see figures 4 and 5). The power
input cable should enter the enclosure via one of the M20
cable entries and be connected to the supply terminals (L and
N) AC units (+ve and –ve) DC units and the telephone signal
cable should enter the enclosure via the other M20 entry and
be connected to the telephone terminal.
A single wire with a cross sectional area of up to 4mm² 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.
Figure 4
BExDTS110D AC Sontels
DIP Switch
Volume Control
Telephone Signal
Input Terminals
Mains Supply
Input Terminals
L and N
Pulse Tone
Header Pin
2 off M20
Cable Entries
Internal Earth Terminal
Figure 3
Internal Bonding
Wire Terminal
