Dc Rack Information; Dc Power Distribution Panel - IBM T00 Service Manual

DC Rack Information

This section contains information about dc rack components.

DC Power Distribution Panel

A dc power distribution panel can be installed on the top of the rack to distribute -48 V dc power to the
drawers and devices in the rack. The dc power distribution panel provides separate circuit breakers to
protect each drawer in the rack from excess current.
The dc power distribution panel configurations shown in this book are for example purposes only. The
actual dc power distribution panel installed in your rack may vary in terms of circuit breaker ratings,
configurations, and connections to the customer's dc power source.
The power distribution panel contains a connection on the rear of the panel for attaching a
customer-supplied power alarm. This alarm is activated when any circuit breaker is tripped or is switched
to the off position.
The circuit breaker is a single pole, single toggle handle unit with stud terminals, UL, CSA and VDE
approved, black with "on" and "off" markings, and dc with long trip delay. It is on when the handle is up,
and it is off when the handle is down.
The following illustration shows a typical dc power distribution panel (internal view).
7
1 Mounting Screws
2 Top Cover
3 Bus Bar Shield (Insulation)
4 Terminal Block (Both Sides of the
Rear Cover)
5 Covers for Empty Circuit Breaker
Positions
10
7014 Model T00, and Model T42 Service Guide
1
9
8
5
6
2
3
4
6 Front Bezel
7 Bezel Mounting Screws
8 Circuit Breaker Switches
9 Circuit Breaker Position Labels