Redundant Power Inputs; Alarm Contact - Moxa Technologies EtherDevice Hardware Installation Manual

Redundant Power Inputs

Moxa EtherDevice Server has two DC power inputs located on its
top panel. For detailed instructions on how to connect the power
wires to the terminal block connector, see the Wiring the
Redundant Power Inputs section from Chapter 3.
From the user's point of view, the function of the redundant power
inputs is quite straightforward. Both inputs can be connected
simultaneously to live DC power sources. If one power source fails,
the other live source acts as a backup, and automatically supplies
all of Moxa EtherDevice Server's power needs.

Alarm Contact

Moxa EtherDevice Server has one Alarm Contact located on the
top panel. For detailed instructions on how to connect the Alarm
Contact power wires to the 3-terminal terminal block connector,
see the Wiring the Alarm Contact section from Chapter 3.
The Alarm Contact has two terminals that form a Fault circuit for
connecting to an alarm system. These two contacts form a closed
circuit when Moxa EtherDevice Server is receiving power from both
DC power inputs. The circuit opens if power to one of the power
inputs is cut off, or if the Moxa EtherDevice Server self-test fails,
alerting the user to check either the power supply or function of the
Server.
A typical scenario would be to connect the Fault circuit to a
warning light located in the control room. The light can be set up to
switch on when a fault is detected.
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MOXA EtherDevice Server Hardware Installation Guide