E2S D2 C2X05DC024 Series Instructions/Service Manual page 5

+ + + - - - - - + +
S 2 S 3
+
-
S 2
S 3
+
-
Fig. 5b DC Simplified Block Diagram, powering
sounder and beacon independently
9.1 Units First Stage Tones
Stage one (S1) operation: Simply connect the supply voltage
to the + and - supply terminals, (see fig. 8). The Strobe is
powered via factory installed wires connected to the alarm
horn. The wires connecting the alarm horn and strobe can be
removed if the user wishes to power the strobe separately.
9.2 Second, Third and Fourth Stage Tone Selection
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.
Strobe will continue to flash during alarm horn S2, S3 & S4
stages.
DC Sounder Terminals
- - + + E E
24VDC Strobe Terminals
Fig. 6b DC Terminals
__________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH
Document No. D211-00-601-IS-SC
+ + + - - - - - + +
S 2 S 3
E
S3
S2
-
+
- - + + E E
48VDC Strobe Terminals
Issue: F 02-03-2020
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 4 for AC, fig 6 for
DC). 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 D2xC2 DC units, dc reverse line monitoring can be used if
required. All DC units 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 Horn and Strobe
Minimum Resistance 3k9 ohms
Minimum Resistance 1k ohms
48V DC Alarm Horn and Strobe
Minimum Resistance 15k ohms
Minimum Resistance 3k9 ohms
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. 7, 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. 8a or 8b. A
spacing of at least 1/16" (1.58mm) must be provided through air
and over surfaces between uninsulated live parts.
4 - 7mm
Sounder EOL Resistor
Fig. 7 End of Line Resistor Forming
Fig. 8a 48VDC Beacon End of Line Resistor Placement
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Sheet 5 of 9
Minimum wattage 0.5W
Minimum wattage 2.0W
Minimum wattage 0.5W
Minimum wattage 2.0W
5 - 10mm
Beacon EOL Resistor
- +
End of Line Resistor
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