Four-Input 240-A Dc Power Supply Load Sharing And Fault Tolerance; T640 Four-Input 240-A Dc Power Supply Leds; Figure 40: Four-Input 240-A Dc Power Supply Leds; Table 59: Four-Input 240-A Dc Power Supply Leds - Juniper T640 Hardware Manual

Four-Input 240-A DC Power Supply Load Sharing and Fault Tolerance

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T640 Four-Input 240-A DC Power Supply LEDs

Copyright © 2017, Juniper Networks, Inc.
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 103
Troubleshooting the T640 Power System on page 476
Replacing a T640 Four-Input 240-A DC Power Supply on page 366
T640 DC Power Supply Electrical Specifications on page 126
LEDs on each four-input 240-A DC power supply faceplate (see
indicate the status of the power supply. In addition, a power supply failure triggers the
red alarm LED on the craft interface.
LEDs.

Figure 40: Four-Input 240-A DC Power Supply LEDs

Table 59: Four-Input 240-A DC Power Supply LEDs

LED Color
Green
INPUT
—One
PRESENT
per input
CB ON —One per Green
input
Chapter 7: Power System Components and Descriptions
Figure 40 on page 103
CIRCUIT BREAKERS FOR MIN. 60
SEC. TO DE-ENERGIZE THE UNIT
COMPLETELY BEFORE TURN ON.
60A
60A
60A
INPUT 3
60A
Power supply LEDs
State
On steadily
Off
On steadily
Off
Table 59 on page
displays the power supply
Description
Input is receiving voltage.
Input voltage is not present.
Circuit breaker is on.
Circuit breaker is not turned on, or
host subsystem has detected a
failure and has turned the circuit
breaker off.
103)
103