Removing And Replacing A Power Supply - 3Com 3CB9E7 - CoreBuilder 9000 Chassis Switch Getting Started Manual

64 C 7: M
HAPTER AINTENANCE FOR THE
Module LEDs are functioning normally and show
normal readings.
Power requirements for all installed modules are
met by the power supplies.
Power cords from each power supply are not
frayed or damaged.
Cables that run from each installed module are
securely attached and in good condition.
If rack-mounted, the chassis and the cable
management device are securely attached to your
rack.

Removing and Replacing a Power Supply

This section describes how to remove and then
replace the following power supplies in the 7-slot
chassis:
930-watt AC power supply
(Model Number 3CB9EP9)
–48-volt DC power supply
(Model Number 3CB9EP8D7)
7-S C
LOT HASSIS
CAUTION: When you replace a power supply, leave
a sufficient number of power supplies running at
all times to satisfy the power requirements of
installed modules. If you have an installed
Enterprise Management Engine (EME), enter the
command to display current
show power budget
power conditions for the CoreBuilder 9000
Enterprise Switch. If you determine that removal of
a defective, but still functioning, power supply will
not cause a power deficit in the Switch, you can
remove the faulty power supply without losing
power to any modules.
WARNING: Before you attempt to remove a
930-watt AC power supply from the chassis, to avoid
contact with hazardous energy, be sure to set the
power supply's Standby/On switch (Figure 24) to the
Standby position, and to disconnect the power cord
from both the electrical outlet and then the power
supply.
WARNING: Before you attempt to remove a –48-volt
DC power supply from the chassis, to protect the
power supply that you want to remove, set the power
supply's Standby/On switch to the Standby position
and turn off the building power source circuit
breaker.
There are no user-serviceable parts on either the
load-sharing power supplies or on the fan trays. If
these components fail, remove them as described
here and return the components to your supplier.
Keep replacement power supply units and fan trays at
your site so that they are available if needed.