Four-Input 240-A Dc Power Supply Inputs; Tolerance; Figure 37: Four-Input 240-A Dc Power Supply - Juniper T640 Hardware Manual

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Copyright © 2013, Juniper Networks, Inc.

Figure 37: Four-Input 240-A DC Power Supply

LEDs Circuit breakers

Four-Input 240-A DC Power Supply Inputs

The four-input 240-A DC power supply inputs are labeled
and from top to bottom. Each input consists of –48 VDC and return, each with
INPUT 3
its own 60-A circuit breaker.
Table 31 on page 67 describes which components are powered by each input.
Table 31: Components Powered by Each Four-Input 240-A DC Power
Supply Input
Input
INPUT 0
INPUT 1
INPUT 2
INPUT 3
Four-Input 240-A DC Power Supply Load Sharing and Fault Tolerance
When the router is operating normally and both power supplies are switched on, load
sharing between them occurs automatically. When one power supply fails or is turned
off, the other power supply immediately assumes the entire electrical load for the system.
A single power supply can provide full power for as long as the router is operational. If
any of the four inputs fails, the router shuts down, and the other power supply assumes
the electrical load for all four inputs.
T640 Four-Input 240-A DC Power Supply LEDs on page 68
Troubleshooting the T640 Power System on page 207
Replacing a T640 Four-Input 240-A DC Power Supply on page 323
T640 DC Power Supply Electrical Specifications on page 428
Chapter 3: T640 Router Hardware Component Overview
Components
SIBs, control boards, Routing Engines, and half the system fan power
FPCs in slots and and half the system fan power
FPC0 FPC1
FPCs in slots through
FPC2 FPC4
FPCs in slots through
FPC5 FPC7
INPUT 0 , INPUT 1 , and INPUT 2 ,
67