S7800 Series Hardware Installation Guide Chapter 4 Switch Installation
22
4.5.2.2
Installing External PoE Power
If the required total PoE power exceeds the rated power for the built-in power module, the
external PoE power shall be co-used with the built-in power module to provide the greater
PoE power. The following steps shows how to install the external PoE power module:
(1) 2 persons horizontally hold the RG-PSE by both sides before moving it to the installtion
machine frame;
(2) Fix the power module frame, remove the baffle of the power module frame and unscrew
the lid of the power output terminal. If you have configure only one power module,
remove only one of the power baffles before inserting the power module and tightening
the screws.
(3) Unscrew the lid of the DC output terminal on the power frame. Connect one end of the
shipped DC output power cable to the output terminal of the RG-PSE power module,
and connect the other end to the built-in PoE power module(for example,
RG-PA300P)
’
s access port for the externel PoE power cable. It is worth mentioning that
the blue cable connects the
“
-
”
end of RG-PA300P with the
“
load-
”
end of RG-PSE, and
the red cable connects the
“
+
”
end of RG-PA300P with the
“
load+
”
end of RG-PSE.
(4) Connect one end of the shipped power communication line to the built-in PoE power
module
’
s RS485 interface, and connect the other end to the monitoring module
RG-PSE-M
’
s RS485
’
s interface.
(5) Connect one end of the shipped AC power cable to the RG-PSE AC power input
interface, and connect the other end to the monitoring module RG-PSE-M
’
s RS485
interface.
(6) Complete the installation of the external PoE power systerm for the RG-S7800 series
switches. For the more detailed installation, please refer to the
RG-PSE Power Quick
Installation Guide
.
Warning
1. The total PoE power for RG-S7800 must be greater than the power that the
user requires, otherwise it fails to provide the external power on the port.
2. RG-PSE is shipped with a power communication line. Connect one end of
the communication line to the RS485 interface for the built-in PoE power
module. If the communication line is not connected, RG-S7800 will not
monitor the RG-PSE working state, and the host system will fail to identify the
number of the RG-PA800-PSE power modules inserted into the external PoE
power system. By default, the PoE power is calculated in accordance with
only one RG-PA800-PSE inserted.
4.6
Grounding
A PGND is installed on the back of RG-S7800. You must first connect the PGND to the
grounding terminal of the cabinet and then connect the grounding terminal to the grounding
bar of the equipment room.
4.6.1
Precautions
n
The sectional area of the grounding cable should be determined according to the
possible maximum current. Cables of good conductor should be used.
n
Do not use bare wire.
n
The grounding resistance for combined grounding should be less than 1
Ω
.
