Troubleshooting The M320 Power System - Juniper M320 Hardware Manual

M320 Multiservice Edge Router Hardware Guide

Troubleshooting the M320 Power System

292
To verify that a power supply is functioning normally, perform the following steps:
Check the LED on each power supply faceplate (or the corresponding
OUTPUT OK
POWER OK LED on the craft interface). If this LED is on, the power source is good and
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 "M320 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 supplies assume the load, and
you can still view the system status through the CLI or display.
If the power supply LED is off and no red alarm condition exists, check
OUTPUT OK
that the circuit breaker on a DC power supply or the power switch on an AC power
supply 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 power cord (AC) or power cables (DC) from the power source to the
router are not damaged. If the insulation is cracked or broken, immediately replace the
cord or cable. See "Replacing an M320 AC Power Supply Cord" on page 254 or"Replacing
an M320 DC Power Supply Cable" on page
Connect the power supply to a different power source with a new power cord or power
cables. If the power supply
the source of the problem. Replace the power supply with a spare, as described in
"Replacing an M320 AC Power Supply" on page 247
Supply" on page 250.
15.
PEM3 , from top to bottom.
| ).
255.
LED still does not light, the power supply is
OUTPUT OK
or "Replacing an M320 DC Power
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