Chapter 7. Using The -48 V Dc Rack; Setting The Key Mode Switch; Starting The -48 V Dc Rack - IBM R30 Operator's Manual

Chapter 7. Using the -48 V dc Rack

This chapter contains information about using the -48 V dc rack.
For information about using an AC rack and the devices installed in an AC rack, refer to
Chapter 3.
Some devices installed in an AC system with a CPU enclosure containing AC power supply
can be installed in a rack with a CPU enclosure containing a -48 V dc power supply.
Note: For information about using devices contained in the CPU enclosure, refer to
Chapter 2.

Setting the Key Mode Switch

Refer to Chapter 2 for information about setting the key mode switch on the CPU enclosure.

Starting the -48 V dc Rack

DANGER
An electrical outlet that is not correctly wired could place hazardous voltage
on metal parts of the system or the devices that attach to the system. It is the
responsibility of the customer to ensure that the outlet is correctly wired and
grounded to prevent an electrical shock.
Before installing or removing signal cables, ensure that the power cables for the
system unit and all attached devices are unplugged.
When adding or removing any additional devices to or from the system, ensure
that the power cables for those devices are unplugged before the signal cables
are connected. If possible, disconnect all power cables from the existing system
before you add a device.
Use one hand, when possible, to connect or disconnect signal cables to prevent
a possible shock from touching two surfaces with different electrical potentials.
During an electrical storm, do not connect cables for display stations, printers,
telephones, or station protectors for communication lines.
CAUTION:
Energy hazard, remove power before servicing. Disconnect two power supply cords.
Starting the DC rack with a 7015 CPU enclosure includes:
Ensuring that all circuit breaker switches on the power distribution panel are set to on.
Starting the CPU enclosure (containing a -48 V dc power supply) by setting the Power
button to on (button pushed in).
7-1
Using the -48 V dc Rack