Troubleshooting Power Supplies In An Ex9200 Switch - Juniper EX9214 Hardware Manual

EX9214 Switch Hardware Guide

Troubleshooting Power Supplies in an EX9200 Switch

Problem
Solution
258
Description: The power system is not functioning normally.
Check the LEDs on each power supply faceplate.
If an AC power supply is correctly installed and functioning normally, the
LEDs light steadily, and the
DC OK
If a DC power supply is correctly installed and functioning normally, the
, and
BRKR ON INPUT OK
Issue the CLI
show chassis environment pem
power supplies. As shown in the sample output, the value
must indicate that each of the power supplies is functioning normally:
State
user@switch> show chassis environment pem
PEM 0 status:
State
Temperature
DC Output
PEM 1 status:
State
Temperature
DC Output
The output is of an EX9208 switch. The output is similar for all EX9200 switches.
If a power supply is not functioning normally, perform the following steps to diagnose
and correct the problem:
If a major alarm condition occurs, issue the
the source of the problem.
If all power supplies have failed, the system temperature might have exceeded the
threshold, causing the system to shut down.
NOTE: If the system temperature exceeds the threshold, Junos OS shuts
down all power supplies so that no status is displayed.
Junos OS also can shut down one of the power supplies for other reasons.
In this case, the remaining power supplies provide power to the switch ,
and you can still view the system status through the CLI or display.
Check that the DC circuit breaker
that the power supply is receiving power.
Verify that the source circuit breaker has the proper current rating. Each power supply
must be connected to a separate source circuit breaker.
LED is not lit.
PS FAIL
LEDs glow steady green.
command to check the status of installed
Online
OK
Voltage(V) Current(A) Power(W)
48 12
Online
OK
Voltage(V) Current(A) Power(W)
50 12
show chassis alarms
or AC input switch
(—)
AC OK
PWR OK
Online in the rows labeled
Load(%)
576 36
Load(%)
600 37
command to determine
is in the on position and
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