©2002 Digitrax, Inc
www.digitrax.com
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3.2 Common Rail Wiring
Whole layout common rail is a method of wiring layouts where power districts
and their boosters are electrically connected using a common rail or common
power bus return wire. Whole layout common rail wiring is a disadvantage
when it comes to detection systems since detectors cannot independently moni-
tor whether zone power is on or off so they can't tell whether occupancy detec-
tion is working in any given detection section. See Figure 2: Whole Layout
Common Rail Wiring for an example of wiring a single power district and
one zone with four detection sections.
44..00
BBDDLL116622
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The BDL162 wiring panels should be located near the highest feeder density in
order to minimize the lengths of wires feeding from the track to the BDL162.
Planning the detection sections on the layout and the associated wiring on the
wiring panel is covered in more detail in the technical applications paper,
Advanced Transponding Application Note, available at www.digitrax.com. The
paper includes photographs of a sample installation of the BDL162 with associ-
ated PM42 and RX4. Figure 3 shows suggested minimum space requirements
for installing a single BDL162 and the optional RX4 Transponding Detector on
a wiring panel. See the RX4 manual for more information. Allow space on
your mounting panel for the terminal strip, additional BDL162s and any
PM42s required for power management.
1. Drill mounting holes in the end of the 44-pin connector (Figure 3) or mount
using existing holes and right angle brackets.
2. Screw the connector directly to the wiring panel board.
Figure 3: BDL162 Installation Space
©2002 Digitrax, Inc
www.digitrax.com
6
Figure 2: Whole Layout Common Rail Wiring Example
