7.4 Cable Glands, Blanking Elements & Adapters
Ingress Protection
Adapters
The D2x Loudspeaker range can be supplied with the following types
of adapters:
M20 to M25
It is important to note that stopping plugs cannot be fitted onto
adapters, only directly onto the M20 entries.
To maintain the ingress protection rating and mode of
protection, the cable entries must be fitted with suitably rated,
certified cable entry and/or blanking devices during
installation.
8) Wiring
The cable connections are made into the terminal blocks on the PCB
assembly located in the enclosure. See section 6.4 of this manual for
access to the enclosure.
Refer to Wiring Schematic D190-06-201 Configs. 1a -2d or 4a-5f for
Line in Loudspeakers and Config. 3 for Low impedance wiring details.
9) End of Line Monitoring (DC Units)
DC line monitoring can be used if required. Both the Line In 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 resistor must be connected directly across the terminals. Whilst
(1.58mm) must be provided through air and over surfaces between
uninsulated live parts.
For Line in units the end of line resistor used must have minimum
resistance values of:
70/25V Line in Loudspeaker:
Minimum resistance 3K9 Ohms Minimum Power 0.5W
Minimum resistance 1K Ohms Minimum Power 2.0W
100V Line in Loudspeaker:
Minimum resistance 15K Ohms Minimum Power 0.5W
Minimum resistance 3K9 Ohms Minimum Power 2.0W
For Low Impedance units the end of line resistor used must have
minimum resistance values of:
Minimum resistance 2K Ohms Minimum Power 0.5W
Minimum resistance 500 Ohms Minimum Power 2.0W
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 5).
Fig. 5 Low Impedance Line Monitoring Link
10) Maintenance, Overhaul and Repair
Maintenance, repair and overhaul of the equipment should only be
carried out by suitably qualified personnel in accordance with the
current relevant standards:
For ATEX/IECEx or UKEx:
EN60079-19/IEC60079-19
Explosive atmospheres Equipment repair, overhaul and
reclamation
EN 60079-17/IEC60079-17
Explosive atmospheres Electrical installations inspection
and maintenance
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.
Potential electrostatic charging hazard Clean only with a damp
cloth.
