E2S BExL15D, Instruction Manual, Page: 5 / 12

European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH www.e2s.com Tel: +44 (0)208 743 8880
Document No. D210-00-101-IS Issue 6 12-09-2022 Sheet 5 of 5
11
Low Impedance Wiring
Fig. 5 Low Impedance Terminals
BExL15D/BExL25D 8Ω and 16Ω low impedance loudspeakers
have dual input terminals on the pcb assembly for input and
output wiring. A cable of up to 2.5mm² can be connected to
each terminal. If dc line monitoring is used cut the link on the
board (see figure 5 and section 14 of this manual).
12.2 Line Monitoring
On BExL15D and BExL25D loudspeakers, dc line monitoring
can be used if required. Both the 70V and 100V 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 the low impedance
units care must be taken with the polarity of the monitoring
voltage.
On 100V and 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 figure 5).
11. Maintenance, Overhaul & Repair
Maintenance, repair and overhaul of the equipment should
only be carried out by suitably qualified personnel in
accordance with the current relevant standards:
EN60079-19
IEC60079-19 Explosive atmospheres - Equipment
repair, overhaul and reclamation
EN 60079-17
IEC60079-17 Explosive atmospheres - Electrical
installations inspection and maintenance
The acoustic horn is made out of ABS plastic, therefore to
avoid a possible ELECTROSTACTIC CHARGE the unit must
only be cleaned with a damp cloth.
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.
- - + +
DC Line
Monitoring
Link