Contemporary Control Systems AI-USB Adapters - Manual (Page 6)

TD030500-0IB
6
AC Powered
If AC power is desirable, the AI-USB can be powered by the
secondary of a low-voltage transformer (
Figure 9 ) whose
primary is connected to the AC mains. The secondary voltage
must be in the range of 8–24 VAC and must not be grounded.
When using a grounded secondary transformer, refer to Figure
10. For convenience, two AC power adapters are available
from Contemporary Controls: the AI-XFMR is for 120 VAC
primary power and the AI-XFMR-E is for 230 VAC primary
power.
0Vdc
Figure 9 — AC Powered
0Vdc
Figure 10 — AC Power with Grounded Secondary
AC Powered with Battery Backup
The AI-USB can also be powered from both an AC and DC
source. Usually the DC source is from a battery connected as
the DC-powered option. Refer to
Figure 11 for details. In
this application the AI-USB does not charge the battery, so
separate provisions are required for charging. If the AC source
fails, the AI-USB will operate from the battery.
+
0Vdc
Figure 11 — AC Power with Battery Backup