Vimpex BExS110D Instruction Manual Download

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8) Power Supply Selection

It is important that a suitable power supply is used to run the
equipment. The power supply selected must have the
necessary capacity to provide the input current to all of the
units.

The following table shows the input current taken by the
various sounders and shows the maximum voltage at which
the sounders can be operated:

The input current will vary according to the voltage input level
and the frequency of the tone selected. The current levels
shown above are for the 440Hz Continuous tone @ nominal
input voltage.

9) Selection of Cable. Cable Glands, Blanking

Elements & Adapters

When selecting the cable size, consideration must be given
to the input current that each unit draws (see table above),
the number of sounders on the line and the length of the
cable runs. The cable size selected must have the necessary
capacity to provide the input current to all of the sounders
connected to the line.

For ambient temperatures over +40ºC the cable entry
temperature may 70ºC and therefore suitable heat
resisting cables and cable glands must be used, with a rated
service temperature of at least 110ºC

The dual cable gland entries have an M20 x 1.5 entry thread.
To maintain the ingress protection rating and mode of
protection, the cable entries must be fitted with suitably rated
ATEX / IECEx certified cable glands and/or suitably rated
ATEX / IECEx certified blanking devices during installation
according to EN / IEC60079-14.

If a high IP (Ingress Protection) rating is required then a
suitable sealing washer must be fitted under the cable glands
or blanking plugs.

For use in explosive dust atmospheres, a minimum ingress
protection rating of IP6X must be maintained.

The BEx sounder range can be supplied with the following
types of adapters:

M20 to ½” NPT
M20 to ¾” NPT
M20 to M25

It is important to note that stopping plugs cannot be fitted
onto adapters, only directly onto the M20 entries.
Any other adapters used must be suitably rated and ATEX /
IECEx certified adapters.

10) Earthing

Both AC and DC sounder units must be connected to an
earth. The units are provided with internal and external earth
terminals which are both located on the terminal chamber
section of the unit.

Fig. 3 Internal View of Cover

When using the internal earth terminal ensure that the
stainless steel M4 flat washer is between the incoming earth
wire and the enclosure.

Internal earthing connections should be made to the Internal
Earth terminal in the base of the housing using a ring crimp
terminal to secure the earth conductor under the earth clamp.
The earth conductor should be at least equal in size and
rating to the incoming power conductors.

External earthing connections should be made to the M5
earth stud, using a ring crimp terminal to secure the earth
conductor to the earth stud. The external earth conductor
should be at least 4mm² in size.

11) Cable Connections

Electrical connections are to be made into the terminal blocks
on the PCBA located in the flameproof enclosure. See
section 7 of this manual for access to the flameproof
enclosure.

Wires having a cross sectional area between 0.5 mm² to
2.5mm² can be connected to each terminal way. If an input
and output wire is required the 2-off Live/Neutral or +/-
terminals can be used. If fitting 2-off wires to one terminal
way the sum of the 2-off wires must be a maximum cross
sectional area of 2.5mm². Strip wires to 8mm. Wires may also
be fitted using ferrules. Terminal screws need to be tightened
down with a tightening torque of 0.45 Nm / 5 Lb-in. When
connecting wires to the terminals great care should be taken
to dress the wires 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.