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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. D190-00-251-IS-SC Issue: 4 37-08-15 Sheet 3 of 3
The cable connections are made into the terminal blocks on the
PCB assembly located in the explosionproof enclosure. See
section 5 of this manual for access to the explosionproof
enclosure. The 70V Line loudspeakers are fitted with a five way
terminal block. Terminal A is common and one of the other
terminals B, C, D or E should be selected depending on what
output level is required (see table below).
Terminals
D1xL2 (25W)
D1xL1 (15W)
A - B
25W
15W
A - C
12.5W
7.5W
A - D
6W
3W
A - E
2W
1W
A single wire with a cross sectional area of up to 2.5mm² /
AWG14 can be connected to each terminal way or if an input
and output wire is required two wires can be connected to each
terminal way when crimped with a ferrule. If more than one wire
is fitted into a terminal a ferrule should be used to secure the
wires. 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.
7) Low Impedance Wiring
Fig. 4 Low Impedance Terminals
D1xL2 and D1xL1 8 ohm and 16 ohm low impedance
loudspeakers have dual input terminals on the PCB assembly
for input and output wiring. A cable of up to 4.0mm² can be
connected to each terminal. If DC line monitoring is used cut the
link on the board (see Fig. 4).
8) Earthing
The unit has both a primary internal and secondary external
earth fixing point.
Internal earth connections should be made to the internal Earth
terminal (see Fig. 3 and 4. It should be fitted to the internal earth
point using a ring crimp terminal to secure the earth conductor.
In addition, external earth connections can be made to the M5
earth stud (see Fig. 2), using a ring crimp terminal to secure the
earth conductor to the earth stud. The external earth crimp ring
should be located between the two M5 plain washers provided
and securely locked down with the M5 spring washer and M5
nut.
The earth conductor should be at least equal in size and rating
to the incoming power conductors but at least a minimum of
0.82mm
2
/ 18AWG in size.
9) End of Line DC Monitoring
On D1xL2 and D1xL1 Loudspeakers, DC line monitoring can be
used if required. Both the 70V Line units and the Low Impedance
units have blocking capacitors fitted. It should be noted that each
loudspeaker has a 1M ohm bleed resistor connected across the
blocking capacitor and this should be taken into account when
selecting the value of the end of line monitoring resistance.
The end of line monitoring resistor can be connected across the
terminals on the end of line unit.
On 70V line units the end of line resistor used must have a
minimum resistance value of 4k7 ohms and a minimum wattage
of 2.5 watts
On low impedance units the end of line resistor used must have
a minimum resistance value of 2k ohms and a minimum wattage
of 0.5 watts or a minimum resistance value of 500 ohms and a
minimum wattage of 2 watts. On the low impedance units care
must be taken with the polarity of the monitoring voltage. If an
end of line resistor is fitted to a unit the links on the printed circuit
boards of all loudspeakers in the line must be cut for the dc
blocking capacitors to be in circuit in order to dc monitor the line
(see Fig 4).
10) Maintenance, Repair and Overhaul
Maintenance, repair and overhaul of the equipment should only
be carried out by suitably qualified personnel in accordance with
the current relevant standards and regulations.
Units must not be opened while an explosive atmosphere is
present.
If opening the unit during maintenance operations a clean
environment must be maintained and any dust layer removed
prior to opening the unit.
The threaded flamepath joints are not intended to be repaired.
- - + +
DC Line
Monitoring Link
Internal Earth
Terminal
