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:
1. Move the power switch on the power supply to the off (o) position.
2. Turn off power to where the AC line goes into the power distribution module (PDM) area.
3. Wait for the power supply LEDs to fade out and for the fans inside the power supply 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.
4. Turn on power to where the AC line goes into the power distribution module (PDM) area.
5. Move the power switch on the power supply to the on (|) position.
6. Verify that the LEDs on the power supply faceplate are properly lit.
7. Issue the CLI show chassis environment pem command and verify the State is ONLINE and the
Temperature is OK.
To restart a high-capacity DC power supply after a shut down due to an over-temperature situation:
1. Switch off the circuit breaker(s) on the DC distribution panel to remove power to the chassis and power
supplies.
2. Switch on the circuit breaker(s) on the distribution panel to power up the chassis and power supplies.
NOTE: The power switch on the power supplies is not part of the outer or inner DC
circuits and therefore does not need to be switched off when restarting the chassis.
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