MEDC DB3B - Manuel (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
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, common +ve): Connect 3 supply wires to the terminals as detailed in the wiring
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
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
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