Contemporary Controls Metasys JC-MER-CXB, Руководство пользователя, Страница: 19 / 58

TD060100-0MA
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AC Powered
If only AC power is available, the JC-MER-CXB can be powered by
the secondary of a low-voltage transformer whose primary is
connected to the AC mains. The secondary must be 8–24 VAC and
ungrounded. When using a grounded secondary transformer, refer to
Figure
11
. For convenience, two auxiliary power supplies are
available from Contemporary Controls: the AI-XFMR is for 120 VAC
primary power and the AI-XFMR-E uses 230 VAC.
Figure 10 — AC Powered
Figure 11 — AC Power with Grounded Secondary
AC Powered with Battery Backup
The JC-MER-CXB 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 12
for details. In this application the unit does
not charge the battery, so separate provisions are required for charging.
If the AC source fails, the unit will operate from the battery.
Figure 12 — AC Power with Battery Backup