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TM293 MEDC DB3BM UL Technical Manual
Sounder/Horn – dB3BM uL
TM293.A August 2022 www.eaton.com
DC input, 3 stage without monitoring wiring
details (Type 3)
This type can be configured in a number of different ways
depending on requirements. Independent tone selection
for all 3 stages is via the 3 off 5-way DIP switches fitted to
the electronics assembly:
•
2-wire system (Single stage): Connect the positive and
negative supply wires to the terminals as detailed in the
wiring diagram.
•
2-wire system (Dual stage, reverse polarity): Connect
the positive and negative supply wires to the terminals
as detailed in the wiring diagram. The second stage is
produced by reversing the polarity of the supply to the
unit.
•
3-wire system (Dual stage, ve): Connect 3
supply wires to the terminals as detailed in the wiring
diagram (1 ve wire and 2 -ve wires). Stage 1
is produced when power is applied across the common
+ve and stage 1 -ve terminals. Stage 2 is produced
when power is applied across the ve and
stage 2 -ve terminals.
•
3-wire system (Dual stage, common -ve): Connect 3
supply wires to the terminals as detailed in the wiring
diagram (2 +ve wires and 1 common -ve wire). Stage
1 is produced when power is applied across the stage
1 +ve and common -ve terminals. Stage 2 is produced
when power is applied across the stage 2 +ve and
common -ve terminals.
•
4-wire system (Triple stage, Common -ve): Connect 4
supply wires to the terminals as detailed in the wiring
diagram (3 +ve wires and 1 common -ve wire). Stage
1 is produced when power is applied across the stage
1 +ve and common -ve terminals. Stage 2 is produced
when power is applied across the stage 2 +ve and
common -ve terminals. Stage 3 is produced when
power is applied across the stage 3 +ve and common
-ve terminals.
All versions are supplied with terminals to allow loop-in
loop-out connection of the supply wires
ote:
N
If an EOL resistor is specified on a DC unit, it will
be fitted as standard across terminals 5 & 6 in
the Exd chamber (see below). Re-position EOL as
required for other configurations.
When positioning the EOL, ensure there is a
minimum of 9/16” (14mm) free space between the
resistor body and terminal block and ensure the
resistor is not in contact with the PCB or housing.