Contemporary Control Systems AI-USB Adapters - Manual (Page 5)

TD030500-0IB
5
Software
Driver installation instructions are provided in the readme file
located on the disk that accompanies the product.
Powering The AI-USB
The AI-USB requires low voltage AC or DC power applied to
its four-pin removable keyed plug. Consult the Specifications
page for the power requirements. Several methods to provide
power are described below.
DC Powered
Make connections as shown in Figure 7 . The AI-USB uses a
DC-DC converter that accepts a wide range of voltage ( 10–30 VDC )
which it converts for internal use. The “0 Vdc” terminal is not
connected to chassis within the AI-USB. The input connections
are reverse-voltage protected.
+
0Vdc
Figure 7 — DC Powered
Redundant DC Powered
Redundant diode-isolated DC power inputs are provided on the
AI-USB for when a concern exists that the AI-USB remain
operational in the event of a primary power failure. Make the
connections as shown in
Figure 8 . Each power supply must be
capable of powering the AI-USB. Do not assume that input
currents from the two supplies will be balanced.
+ +
0Vdc
Figure 8 — Redundant DC Power