Replacing T640 Power System Components
The router has either one nonredundant power supply or two redundant, load-sharing
DC power supplies. Each redundant power supply is hot-insertable and hot-removable.
When a redundant power supply is powered down or removed, the other power
supply automatically assumes the entire electrical load for the router. If you have
only one power supply, you must power off the system before removing the power
supply. See Powering Off the T640 Router.
To replace a power system component, perform the following procedures:
■ Replacing a T640 Two-Input 160-A Power Supply on page 1
■ Replacing a T640 Three-Input 240-A Power Supply on page 7
■ Replacing a T640 Four-Input 240-A DC Power Supply on page 17
■ Replacing a T640 Power Supply Cable on page 23
■ Replacing a T640 Power Supply Filter Element on page 30
Replacing a T640 Two-Input 160-A Power Supply
■ Removing a T640 Two-Input 160-A Power Supply on page 1
■ Installing a T640 Two-Input Power Supply on page 4
Removing a T640 Two-Input 160-A Power Supply
The power supplies are located at the rear of the chassis below the SIBs. Each
two-input 160-A power supply weighs approximately 23 lb (10.5 kg).
CAUTION: Do not leave a power supply slot empty for more than 30 minutes while
the router is operational. For proper airflow, the power supply must remain in the
chassis, or a blank panel must be used in an empty slot.
Replacing T640 Power System Components ■ 1
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