Table 44: T640 Power Supply Alarm Messages - Juniper T640 Hardware Manual

Table 44: T640 Power Supply Alarm Messages

Alarm Type LCD Message
Red
PEM pem-number Over Temp
PEM pem-number Output Fail
PEM pem-number Input Fail
Yellow
PEM pem-number Removed
PEM pem-number Inputs Cfg
Solution
Copyright © 2013, Juniper Networks, Inc.
To troubleshoot the T640 power system:
If the LED on one of the power supplies lights, check the fans and air
1. OVER TEMP
filters in the chassis to be sure they are functioning and providing sufficient airflow.
Check the display on the craft interface. The Junos OS constantly updates the screen
2.
with status information for each component. For more information about the display,
see "T640 Craft Interface Description" on page
NOTE: On the display and in the CLI, the power supplies are referred to
as PEM0 and
NOTE: If the system temperature exceeds the threshold, the Junos OS
shuts down all power supplies so that no status is displayed on the craft
interface.
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 a red alarm condition occurs, check the display on the craft interface to determine
3.
the source of the problem.
If the LED is not lit on one or both of the power supplies,
4. DC OK
Check the power supply fans to see if they are operating.
Check the red alarm LED on the craft 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 no red alarm condition exists, verify that the circuit breaker on the two-input 180-A
DC power supply, three-input 240-A DC power supply, or four-input 240-A DC power
Chapter 16: Troubleshooting T640 Router Hardware Components
CLI Message
PEM pem-number Over Temperature
PEM pem-number Output Failure
PEM pem-number Input Failure
PEM pem-number Removed
PEM pem-number Configuration
Mismatch-number of inputs
52.
PEM1 , from top to bottom.
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