T640 Four-Input 240-A Dc Power Supply Leds; Figure 31: Four-Input 240-A Dc Power Supply Leds; Table 23: Four-Input 240-A Dc Power Supply Leds - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
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T640 Four-Input 240-A DC Power Supply LEDs

56
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 56
Troubleshooting the T640 Power System on page 171
Replacing a T640 Four-Input 240-A DC Power Supply on page 254
T640 DC Power Supply Electrical Specifications on page 348
LEDs on each four-input 240-A DC power supply faceplate (see Table 23 on page 56)
indicate the status of the power supply. In addition, a power supply failure triggers the
red alarm LED on the craft interface. Figure 31 on page 56 displays the power supply LEDs.

Figure 31: Four-Input 240-A DC Power Supply LEDs

Table 23: Four-Input 240-A DC Power Supply LEDs

LED Color
Green
INPUT
—One
PRESENT
per input
CB ON —One per Green
input
DC OK —One per Blue
power supply
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 Description
On steadily Input is receiving voltage.
Off Input voltage is not present.
On steadily Circuit breaker is on.
Off Circuit breaker is not turned on, or
host subsystem has detected a
failure and has turned the circuit
breaker off.
On steadily When all four inputs are properly
energized, the
that the power supply is functioning
normally.
Blinking Either the power supply is starting
up, or it is not functioning, not
properly installed, or not operating
properly.
Copyright © 2010, Juniper Networks, Inc.
LED indicates
DC OK