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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.e2s.com Fax: +44 (0)208 740 4200
Document No. D211-00-471-IS-SC Issue A 27-11-19 Sheet 4 of 8
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External
Earth
Internal
Earth
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+
- - + +
- - + +
- - + +
7) 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 +/- 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.
8) Wiring
2-off 2-way terminal blocks are provided on the beacon for
power. There are 2-off +ve & 2-off
–ve terminals in total.
8.1
Wiring Diagrams
Fig. 3 D2xB1LD3 DC Simplified Block Diagram
Fig. 4 D2xB1LD3 Terminals
8.2
Line Monitoring
DC reverse line monitoring can be used if required. All
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:
24V DC applications
Minimum resistance 3K9 Ohms
Minimum Power 0.5W
Minimum resistance 1K Ohms
Minimum Power 2.0W
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. 5a, 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. 5b.
A spacing of at
least 1/16” (1.58mm)
must be provided
through air and over surfaces between uninsulated live parts.
Fig. 5a End of Line Resistor Forming
Fig. 5b End of Line Resistor Placement
9) Earthing
The unit has both internal and external earth points, (please
see fig 6).
Internal earthing connections should be made to the internal
earth point on the PCBA, (please see fig 6). The earth
conductor should be at least equal in size and rating to the
incoming power conductors. The internal earth bonding wire
connects the cover earth point to the internal earth terminal in
the base.
External earth 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 4mm
2
in size. 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.
Fig 6 Earth locations
End of Line Resistor
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+
