__________________________________________________________________________________________________________________
European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: +44 (0)208 743 8880
www.e-2-s.com Fax: +44 (0)208 740 4200
Document No. D189-00-001-IS Issue: 9 01-06-16 Sheet 5 of 7
Fig. 7b DC Simplified Block Diagram (positive switching)
9.3 Unit’s First Stage Tones
Stage one (S1) operation: Simply connect the supply voltage to
the + and - supply terminals, (see fig. 8).
9.4 DC Units Second, Third and Fourth Stage Tone
Selection
For units set up for –ve switching (default setting):
Stage two (S2) operation: Power +ve and –ve, link a -ve supply
line to the S2 terminal.
Stage three (S3) operation: Power +ve and –ve, link a -ve
supply line to the S3 terminal.
Stage four (S4) operation: Power +ve and –ve, link a -ve
supply line to both the S2 & S3 terminals.
For units set up for +ve switching (refer to 9.1):
Stage two (S2) operation: Power +ve and –ve, link a +ve
supply line to the S2 terminal.
Stage three (S3) operation: Power +ve and –ve, link a +ve
supply line to the S3 terminal.
Stage four (S4) operation: Power +ve and –ve, link a +ve
supply line to both the S2 & S3 terminals.
Fig. 8 DC Terminals
10) Earthing
The unit has both internal and external earth terminals, (please
see fig 3).
Internal earthing connections should be made to the internal
earth terminal on the PCBA, (please see fig 8 for DC, fig 5 for
AC). The earth conductor should be at least equal in size and
rating to the incoming power conductors. The internal earth
bonding wire connects the PCBA earth terminal to the internal
earth terminal in the enclosure back box.
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.
11) End Of Line Monitoring (DC Units Only)
On D2xS1 DC units, dc reverse line monitoring can be used if
required. All DC alarm horns 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 Alarm horns
Minimum Resistance 3k9 ohms
Minimum wattage 0.5W
Minimum Resistance 1k ohms
Minimum wattage 2.0W
48V DC Alarm horns
Minimum Resistance 15k ohms
Minimum wattage 0.5W
Minimum Resistance 3k9 ohms
Minimum wattage 2.0W
The resistor must be connected directly across the +ve and –
ve terminals as shown in the following drawing. Whilst keeping
its leads as short as possible, a spacing of at least 1/16 inch
(1.58mm) must be provided through air and over surfaces
between uninsulated live parts.
Fig. 9 End Of Line Resistor
Stage Polarity
Control
(See fig.6)
End Of Line Resistor
STAGE 4 = S2 + S3
(Customer
Supplied)