Power Distribution with the Power Distribution Panel
Note: The -48 V DC Model S00 rack must be connected to a -48 V DC supply
source which is electrically isolated from its AC power source. The -48 V DC
power source must also be reliably grounded.
Note: The -48 V DC Model S00 rack may be connected to more than one power
source.
The circuit breakers in a power distribution panel are mounted on two power bus
bars. The bus bars may be connected either to a common or to separate customer
-48 V DC power sources.
Typically, a PDP connected to two customer power sources will contain two matching
banks of circuit breakers. Each bank of circuit breakers is connected to a separate
power source. The -48 V DC power supply in each drawer in the rack is then
connected to one circuit breaker in each bank of the PDP. Thus, if one of the
customer power sources were to fail, the devices in the rack would still receive power
from the other source.
If a PDP is connected to only one customer power source, then the drawers in the
rack will be connected to only one circuit breaker each.
The exact configuration of power distribution in a Model S00 rack with a power
distribution panel depends on the particular configuration of drawers installed in the
rack. The diagrams on the following pages illustrate several general examples of
power distribution for a standalone Model S00 rack containing a CPU enclosure.
When servicing the power distribution system in a -48 V DC Model S00 rack, take
care to determine the exact configuration being used prior to servicing.
Chapter 1. Reference Information 1-9
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