Troubleshooting The T320 Power System - Juniper Core Router T Series Hardware Manual

Troubleshooting the T320 Power System

Problem
Solution
Copyright © 2018, Juniper Networks, Inc.
Description: The power system is not functioning normally.
Check the OUTPUT OK LED on each power supply faceplate (or the corresponding
LED on the craft interface). If this LED is on, the power source is good and
POWER OK
the power supply is functional.
Check the display on the craft interface. The Junos OS constantly updates the screen
with status information for each component. For more information about the display,
see "T320 Craft Interface Description" on page
NOTE: On the display and in the CLI, the power supplies are referred to as
PEM0 through
If a power supply is not functioning normally, perform the following steps to diagnose
and correct the problem:
If the power supply LED is off, check the red alarm LED on the craft
OUTPUT OK
interface. The Junos OS monitors the system temperature, and if it exceeds a certain
limit, the software triggers a red alarm, a condition that shuts down the power supplies.
If a red alarm condition occurs, check the display on the craft interface to determine
the source of the problem.
NOTE: If the system temperature exceeds the threshold, the Junos OS
shuts down all power supplies so that no status is displayed.
The Junos OS also can shut down one of the power supplies for other
reasons. In this case, the remaining power supply assumes the load, and
you can still view the system status through the CLI or display.
If the OUTPUT OK power supply LED is off and no red alarm condition exists, check
that the circuit breaker is switched to the on position (
Verify that the source circuit breaker has the proper current rating. Each power supply
must be connected to a separate source circuit breaker.
Verify that the DC power cables from the power source to the router are not damaged.
If the insulation is cracked or broken, immediately replace the cord or cable.
Connect the power supply to a different power source with a new DC power cable. If
the power supply
OUTPUT OK
of the problem. Replace the power supply with a spare, as described in
T320 DC Power Supply" on page
Chapter 32: Troubleshooting Components
20.
PEM3 , from top to bottom.
LED still does not light, the power supply is the source
249.
).
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"Replacing a
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