Power Distribution Panel - IBM R30 Operator's Manual

Power Distribution Panel

The power distribution panel (PDP) is installed in a 7015 Model R00 rack with a 7015 CPU
enclosure containing a -48 V dc power supply. The PDP provides circuit breakers that
protect each drawer in the rack from excess currents and functions as a DC power switch
for switching off power to the rack before servicing.
The PDP contains six circuit breakers consisting of two 50-amp circuit breakers and four 10-
amp circuit breakers. One of the 50-amp circuit breakers is used to send power to Input A of
the -48 V dc power supply, and the other 50-amp circuit breaker is used to send power to
Input B of the -48 V dc power supply in the CPU enclosure. The four 10-amp circuit
breakers control power to the disk drive drawers in the rack.
The PDP can receive power from a customer's two separate power sources. With this
arrangement, three circuit breakers receive power from one power source, and the
remaining three circuit breakers receive power from a separate power source. The two 10
amp circuit breakers receiving power from a separate power source can control power to
disk drive drawers in an attached rack.
The PDP contains a connection location on the rear cover for attaching a circuit breaker
alarm light for indicating when any circuit breakers are switched to the off position; the alarm
light is provided by the customer. The circuit breaker switch is on when it is in the up
position, and the switch is off when it is in the down position.
50-Amp
Circuit
Breaker
A1
On Position (Up)
Off Position (Down)
6-2
Operator Guide
10-Amp 50-Amp
Circuit Circuit
Breaker Breaker
A3 A5
10-Amp
Circuit
Breaker
Circuit Breaker
B1 B3 B5
Position Labels
Covers for Empty
Circuit Breaker
Positions
Switch