MEDC DB3B UL Manuel Technique page 5

DC version – 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
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the wiring diagram.
2-wire system (Dual stage, reverse polarity): Connect the positive and negative supply wires to the
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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, common +ve): Connect 3 supply wires to the terminals as detailed in the wiring
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diagram (1 common +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 common
+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
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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 stage common -ve terminals.
4-wire system (Triple stage, Common -ve): Connect 4 supply wires to the terminals as detailed in the
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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.
© MEDC 2015 02/15