Fan Assembly - 3Com 7700R - Switch Starter Kit Installation Manual

Fan Assembly

The 7- and 8-slot chassis also supports single- and dual-cord AC power module
The dual-cord power module is available in two models for use with 110 V or
120 V AC current:
Single-cord — 3C16854
■
Dual-cord 120 V model — 3C16892
■
Dual-cord 220 V model — 3C16893
■
There are two models of the 8-slot chassis that offer either AC or DC power
modules. Table 31 describes the specifications of each type of power module.
Table 31 Specifications for AC and DC Power Modules
AC Power Module
Specification (7- and 8-slot chassis)
Input 100 V to 240 V, 47 to 63 Hz
Maximum output 460 W
Lightening protection Lightening protection circuit of
the AC power socket
The Switch 7700 power distribution box is installed on the chassis floor in the back
of the chassis. It controls current connection and distribution.
The fan assembly consists of two to four individual fans and is located on the right
side of the chassis:
4-slot chassis — 3C16871
■
7-slot chassis — 3C16856
■
8-slot chassis — 3C16855
■
The fans are directly connected to the backplane through connectors. Fan
operation fault signals are collected and transmitted to the system alarm board
through the backplane.
Figure 19 illustrates the fan assembly for the 7-slot and 8-slot chassis.
Fan Assembly
DC Power Module
(8-slot chassis)
-48 V to -60 V
460 W
2 lightening protectors in the DC
power distributing box
25