Hydronix Ethernet Adapter, User Manual

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Connecting with Sensors Chapter 2
16 Hydronix Ethernet Adapter User Guide HD0333 Rev 2.1.0
1.2
Power over Ethernet (EPK01)
To eliminate the need for a local 24V supply for the adapter and sensors, the optional Power
over Ethernet kit can be used. The arrangement is as shown below:
Junction box close to sensors Control Room Cabinet
Cable To Sensor
Black
RS/485 A
RS/485 B
0v DC
24v DC
Colour
White
Black
Red
MILSPEC
F
G
B
A
EPA01
Ethernet
Power
Adapter
1
EA01
Ethernet
Adapter
1
10/100baseT
CAT5e
linking
EPA01 and
EA01
EPI01
Ethernet
Power
Injector
OUT IN
IEC Mains
Cable
100-240v
50-60Hz
10/100baseT
CAT5e
Ethernet
to EPI01
10/100baseT
CAT5e
Ethernet
to EPA01
10/100baseT
CAT5e
Ethernet
to Network
Figure 3: Connections for Ethernet Adapter and Power Adapter
1.2.1 Location of the Ethernet Power Adapter (EPA01)
The Power Adapter Module (EPA01) should be mounted in the wiring junction box close to
the sensors and beside the Ethernet Adapter, protected from water and excessive dust.
Connect the Ethernet drop cable from the router to the IN port of the Power Adapter. This
cable carries both the power and the Ethernet communications signals. Connect a short
Ethernet cable from the OUT port of the Power Adapter to the Ethernet port on the
Adapter. This cable carries only the Ethernet communications. Connect short insulated
wires from the 24V+ and 0V outputs of the Power Adapter to the 24V+ and 0V inputs of
the Ethernet Adapter, ensuring that the wire is of sufficient power rating to carry the power
for the number of sensors connected.
Connect the RS485 sensor cable to the Ethernet Adapter outputs, taking care to note the
recommendations in the RS485 Wiring Recommendations later in this chapter.
Sufficient ventilation and cooling should be employed to keep the air temperature around
the unit to a suitable level for the number of sensors being powered. The diagram below
shows the number of sensors that can be used at different air temperatures for each
sensor type.