Cisco 7600-SIP-400 - SPA Interface Processor 400 Installation Manual page 228

Removing and Replacing the Power Supply
Before performing any of the following procedures, ensure that power is removed from the DC circuit.
Warning
For proper 6000W DC-input redundant power configuration, all input wires (two pairs for 2800W
Note
DC-input, three pairs for 4500W DC-input, and four pairs for 6000W DC-input) for one 6000W
DC-input power supply must come from the same battery system (A feed); all input wires (two pairs for
2800W DC-input, three pairs for 4500W DC-input, and four pairs for 6000W DC-input) for the other
6000W DC-input power supply must come from another battery system (B feed).
For multiple DC input power supply, each DC input must be protected by dedicated circuit breaker or
Note
fuse. The circuit breaker or fuse should be sized according to the power supply input rating and local or
national electrical code requirements.
When installing the unit, the ground connection must always be made first and disconnected last.
Warning
The 6000 W DC-input power supply provides power of 2800 W, 4500 W, or 6000 W. Select 2800 W by
Note
wiring any two positive (+)/negative (-) terminal pairs in any sequence. Select 4500 W by wiring any
three positive (+)/negative (-) terminal pairs in any sequence. Select 6000 W by wiring all four positive
(+)/negative (-) terminal pairs. The Cisco IOS software detects the wired inputs and sets the proper
system power.
Follow these steps to install a DC-input power supply:
The PWR-6000-DC power supply ground provides the system ground connection when the
Note
PWR-6000-DC power supply is installed in a Cisco 7609-S router. Install the ground as described in this
procedure.
Note For redundant power supplies, you must connect the PWR-6000-DC power supply ground for both
power supplies.
Note You should allow a minimum of 2.5 to 3 inches (63.5 mm to 76.2 mm) of space between the side of the
power supply and any obstructions (such as the side of an enclosed equipment rack). This space is needed
to install and secure the DC-input power cables correctly. Incorrectly routing the DC-input power cables
can cause airflow blockage into the power supply and inadequate strain relief in the cables. The exact
amount of space required depends upon the gauge and flexibility of the DC-input power cables you are
using.
Cisco 7600 Series Router Installation Guide
5-100
Chapter 5 Removal and Replacement Procedures
OL-4503-26