©2004 Digitrax, Inc
www.digitrax.com
7
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.
4
4
.
.
0
0
B
B
D
D
L
L
1
1
6
6
8
8
I
I
n
n
s
s
t
t
a
a
l
l
l
l
a
a
t
t
i
i
o
o
n
n
R
R
e
e
q
q
u
u
i
i
r
r
e
e
m
m
e
e
n
n
t
t
s
s
The BDL168 wiring panels should be located near the highest feeder density in
order to minimize the lengths of wires feeding from the track to the BDL168.
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 (predeces-
sor to the BDL168) with associated PM42 and RX4.
Figure 3
shows suggested
minimum space requirements for installing a single BDL168 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, addi-
tional BDL16 series detectors 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:
BDL168 Installation Space
BDL168 Mounting Considerations
If you are planning to use Digitrax Transponding with your BDL168
please allow the amount of space shown below to install the
RX4 Transponder Receiver.
Note: These areas should be clear of any other layout wiring and
within 12 inches of the BDL168 for best results.
BDL168
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