MEDC DB3B UL Manuel Technique page 7

DC version – Up to 3 stage with or without monitoring (alternative configuration) wiring details (Type 6)
Note: This alternative configuration must be specified when ordering the unit.
This type can be connected either as a three stage common –ve configuration, or if an optional EOL is specified if
can be configured as a dual stage common –ve system with monitoring.
4-wire system (Triple stage, Common +ve): Connect 4 supply wires to the terminals as detailed in the
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wiring diagram (1 common +ve wire and 3 -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
common +ve and stage 2 -ve terminals. Stage 3 is produced when power is applied across the common
+ve and stage 3 -ve terminals.
4-wire system (Dual stage, common –ve with monitoring): Connect 4 supply wires to the terminals as
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detailed in the wiring diagram. 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 common -ve and stage 2 +ve
terminals.
Monitoring functionality is obtained when the supply is connected across M1 & M2 terminals. Note:
monitored terminals are not polarity dependent
DC version with voltage free stage activation wiring details (Type 7)
Connect the positive (+ve) and negative (-ve)
supply wires to the terminals as detailed in the
wiring diagram. When power is applied to the
unit, no tone will be produced initially. Connect
wires and remote switches to terminals R0 to R5
as shown. When the switch connected to R1 is
closed, the stage 1 tone will be produced as
selected by the 5-way DIP switch on the
electronics assembly. When any of the other
switches connected to R2 to R5 is closed, the pre-
selected tone for stages 2 to 5 are produced. See
tone table 2 for details of pre-selected tones.
Note: Closing more than one switch at a time will
result in no tone being produced.
© MEDC 2015 02/15