Contemporary Research TD960801-0MC - Manual (Page 11)

TD960801-0MC
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connector. There are several methods for providing power.
These methods are DC powered, redundant DC powered, AC
powered and AC powered with battery backup.
2.4.1 DC Powered
Make connections as shown in Figure 2-1. The EXTEND-A-
BUS incorporates a DC-DC converter that accepts a wide
voltage range (10–36 VDC) and converts the voltage for
internal use. Input current varies with input voltage so it is
important to size the power conductors accordingly. Input power
to the EXTEND-A-BUS maximizes at 4 watts; therefore, at
10 VDC, the input current is approximately 400 ma. The
ground connection to the EXTEND-A-BUS is connected to
chassis within the EXTEND-A-BUS. The input connections are
reverse voltage protected.
Figure 2-1. DC Powered
2.4.2 Redundant DC Powered
Redundant diode isolated DC power inputs are provided on the
EXTEND-A-BUS for those applications in which there is a
concern that the EXTEND-A-BUS remain operational in the
event of a primary power failure. Make connections as shown in
Figure 2-2. Each power supply source must be sized for the full
4-watt load of the EXTEND-A-BUS. Do not assume that input
currents will be balanced from the two supplies.