User's Manual
Trailblazer Installation and User Manual version 1.02 11
Figure 2: Base Unit Power Connections
If you are not using the CWT power supply, size your power supply adequately
using Ohm’s law. For example, if you provide 12VDC you consume 2/12 A or
about 167mA. If you provide 24VDC you use about half of that or 85mA. CWT
recommends providing at least 4 times the power consumption. The Trailblazer
consumes 2 Watts. CWT’s power supply with battery backup supplies 13.8VDC
@ 1 A or 14 Watts.
You can also power your Trailblazer by using several of the unused voice/data
pairs in a standard 6 pair telephone cable. Don’t forget to allow for additional
current if add-on card options are selected.
The standard 6 pair telephone cable is made of 22 AWG size copper. This
means that both legs will have 3.2 ohms of resistance per 100 feet. The table
below shows the distance at which you have a 5% maximum recommended
voltage drop using 2 pairs of wires paralleled together.
Positive
12 to 24 VDC
Negative
(Normally earth ground)
Terminal Block