3Com 3CB9E7 - CoreBuilder 9000 Chassis Switch, Руководство по началу работы

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76 C
HAPTER
8: M
AINTENANCE FOR THE
8-SL
OT
C
HASSIS AND THE
16-S
LOT
C
HASSIS
■
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 8-slot
chassis and 16-slot chassis:
■
820-watt AC power supply
(Model Number 3CB9EP8)
■
–48-volt DC power supply
(Model Number 3CB9EP8D)
You install and remove the 820-watt power supply in
the same manner, using the same steps for the 8-slot
chassis and the 16-slot chassis.
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
show power budget
command to display current
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 an
820-watt AC power supply from the chassis, to avoid
contact with hazardous energy, be sure to set the
power supply’s On/Off switch to the Off (
Ο
) 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 they are available if needed.