Edge-Core ECS3810-26T, Руководство по установке, Страница: 38 / 76

C
HAPTER
2
| Installing the Switch
Connecting to a Power Source
– 38 –
C
ONNECTING TO A
P
OWER
S
OURCE
This switch supports both AC and DC power supplies.
C
ONNECTING
DC P
OWER
When using -48 VDC power, an external DC power supply must be connected to
the DC power connector on the left side of the front panel.
To connect the switch to a power source:
1.
First verify that the external DC power supply can provide -42 to -56 VDC,
0.57 A minimum.
2.
Prepare two wires for the DC power source. Use 10 to 24 AWG stranded
copper wire. Make sure these wires are not plugged into the power source.
C
AUTION
:
The switch is grounded through its AC power cord. When
connecting DC power, always connect the AC power cord.
W
ARNING
:
Before wiring the DC plug or connecting power to the switch,
ensure that power to the feed lines is turned off at the supply circuit
breaker or disconnected from the power bus.
N
OTE
:
To provide adequate circuit protection between the DC power
supply and the switch, all intermediate wiring and circuitry should be
rated to carry a load at least two times the maximum rating for this
switch (see
"Power Supply" on page 64 ).
N
OTE
:
The wiring between the DC power supply and the switch must be
stranded copper wire within the range of 10 to 24 AWG.
N
OTE
:
Wiring for the power input terminals on the switch are described
below. Wiring of the DC power supply terminals depends on the
equipment in use on the local site, but should be wired in such a way as
to meet the input requirements shown in
"DC Plug Connections" on
page 39 . The wiring should also be color coded according to local
standards to ensure that the input power and ground lines can be easily
distinguished.