
Introduction
– continued
SC
TM
4812ET RF and Power Cabinet Hardware Installation Manual
DRAFT
Apr 2001
V02.03
28
Power Cabinet Internal FRUs
Figure 1-8 shows the location of the Internal Field Replaceable Units.
The FRUs are described in the following paragraphs.
Figure 1-8: Power Cabinet with Batteries Installed (Doors Removed for Clarity)
NOTE
Punch Block
is not visible
in this view.
Rectifier
Shelves
Rectifier
Alarm
Module
DC
Circuit
Breakers
AC
Load
Center
AC Outlet
Cover
Temperature
Control
Module
FRONT VIEW POWER CABINET
Batteries
(Battery
Heaters
located under
batteries)
FW00164
Batteries
The batteries provide a +24V DC backup to the RF Cabinet should AC
Power be lost. The Power Cabinet can accommodate a total of 24 12V
batteries, configured in 12 strings of 2 batteries each. The time duration
of backup provided depends on system configuration.
Battery Heater
The battery heaters provide heating to the batteries in the Power Cabinet.
A separate heater is required for each string of batteries. The heater is a
pad the batteries sit on located top of each battery shelf. The number of
heaters is dependent on system configuration.
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