Etherbus Hardware Manual
Page 10 of 23
Last Revised: 17-Sep-13
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Section 4
Power Wiring
Overview
These industrial Ethernet devices can be powered from the same DC source (typically 24
VDC or 48 VDC) that is used to power your other devices. Refer to the details below on how
to properly wire power to or from your Etherbus devices.
Screw Torque
When tightening the screws be careful to tighten to a maximum torque of 3.48 lb-in.
Switch Power
The Etherbus switch accepts power in the range of 10 to 56 VDC (48 VDC nominal) and can
source 48 VDC power to four PoE devices. For PoE sourcing (PSE) operation, the power
must be in the range of 45 to 56 VDC. Otherwise, the switch will function properly as an
industrial Ethernet switch but will not source any PoE power. For PoE operation, make sure
your 48 VDC supply is rated for at least 16 Watts per PoE channel being sourced, plus some
overhead for the switch. It is recommended that a supply with 75 Watts or more of power be
used. The Etherbus switch supports dual power inputs allowing you to connect a backup
power source. The backup power should have the same voltage as the primary power. Make
your power connections as shown in the diagram below.
The PoE ports when sourcing power will put out 48 VDC* (see note below) over the signal
pair of the RJ45 connection:
o
V+ on RX lines 1 and 2
o
V- on TX lines 3 and 6
o
Lines 4, 5, 7 and 8 are unused
P2 P1
One DC Supply
(10 - 56 VDC)
+ -
Chassis
GND
(panel)
-
+
Two DC Supplies
(10 - 56 VDC)
EB-5ES-PSE
Single DC Power
EB-5ES-PSE
Dual DC Power
+ -
Chassis
GND
(panel)
+
+
+
+
P1
P2
* Note:
When the supply voltage is 45 to 47 VDC then the power output for the PoE will be
the same as the supply voltage. For example, if the supply voltage is 45 VDC then the PoE
output will also be 45 VDC. If the supply voltage is 48 to 50 VDC then the PoE output will
be regulated at 48 VDC.
