Juniper MX960 Hardware Manual page 529

Copyright © 2017, Juniper Networks, Inc.
Connect the power supply to a different power source with a new power cord or power
cables. If the power supply status LEDs indicate that the power supply is not operating
normally, the power supply is the source of the problem. Replace the power supply
with a spare.
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, 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 provide power to the
router, and you can still view the system status through the CLI or display.
To restart a high-capacity AC power supply after a shut down due to an
over-temperature situation:
Move the power switch on the power supply to the off (o) position.
1.
Turn off power to where the AC line goes into the power distribution module (PDM)
2.
area.
Wait for the power supply LEDs to fade out and for the fans inside the power supply
3.
to shutdown. This can take up to 10 seconds.
CAUTION: Do not attempt to power-on the power supply if the LED is
still lit and the fan is still running. If you do, the router will not reboot.
Turn on power to where the AC line goes into the power distribution module (PDM)
4.
area.
Move the power switch on the power supply to the on (|) position.
5.
Verify that the LEDs on the power supply faceplate are properly lit.
6.
Issue the CLI
show chassis environment pem
7.
and the Temperature is
Chapter 31: Troubleshooting Components
command and verify the State is
OK .
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