Cable Connections - E2S D2xB1XH1 Instruction Manual

7) 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 section 14), the
number of beacons 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.
When selecting the cable size consideration must be given to
the voltage drop over the length of the cable run to ensure
the min. input voltage at the point of use (voltage range, see
section 14)
The voltage drop depends on:
- The total current draw of the devices installed on
this cable run
- The wire size and total length of the cable run,
determining the total resistance of this cable run
- The minimum output voltage supplied by the power
supply
The voltage drop and input voltage at the point of use can be
calculated as follows:
Total Wire resistance =
Wire resistance / 1000ft x length of cable run x 2
(length of cable run needs to be multiplied by two to account
for two wires going to and from the unit)
Total current draw =
Current draw per unit x number of units
Voltage Drop = Total current draw x Total wire resistance
Minimum output of power supply =
Min. voltage at point of use + voltage drop
The entries are 2-off M20 x 1.5 thread, 2-off ½" NPT thread &
1-off ¾" NPT thread
For ambient temperatures over +45ºC the cable entry
temperature may exceed +70ºC. Therefore suitable heat
resisting cables and cable glands, rated to min. 85°C must be
used.
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.
For use in explosive gas atmospheres, a minimum ingress
protection rating of IP54 must be maintained.
NPT plugs should be greased before insertion.
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH
Document No. D211-00-251-IS Issue 1 20-08-22

8) Cable Connections

Electrical connections are to be made into the terminal blocks
on the PCBA located in the enclosure. See section 5 of this
manual for access to the 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 0.56 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.
9) Wiring
For further wiring schematics refer to document D211-06-251
9.1. Terminals
3-off 2-way terminal blocks are provided on the beacons for
power. There are 2-off +ve, 2-off –ve, 2-off Earth.
Fig. 3 D2XB1H1 & D2xB1H2 Terminals
9.2. Line Monitoring
On D2xB1XH1 & D2xB1XH2 DC units, DC reverse line
monitoring can be used if required. All DC beacons have a
blocking diode fitted in their supply input lines. An end of line
monitoring resistor can be connected across the +ve and –ve
terminals. If an end of line resistor is used it must have the
following values:
Min. Resistance
3.9KΩ
1KΩ
The resistor must be connected directly across the +ve and
-ve terminals as shown in the following drawing. Form the
resistor legs as shown in Fig. 7a, remove the +ve and –ve
terminal plugs and fit the resistor across the two terminal
plugs before refitting them to the PCBA as shown in Fig. 7b.
A spacing of at least 1/16" (1.58mm) must be provided
through air and over surfaces between uninsulated live parts.
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Min. Power
0.5W
2W
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Sheet 4 of 6