Juniper T1600 Hardware Manual page 210

T1600 Core Router Hardware Guide
Solution
186
The green LED on an AC power supply lights when the power supply is receiving
AC OK
source AC power.
Each CB ON LED on a DC power supply lights when the circuit breaker is on.
Check the LEDs on each three-input 240-A DC or four-input 240-A DC power supply
1.
faceplate.
power supply LED is blinking—Check the red alarm LED on the craft interface.
DC OK
DC OK power supply LED is off and no red alarm condition exists—Check that the
circuit breakers are switched to the
LED on one or both of the power supplies is not lit—Check the power supply
DC OK
fans to see if they are operating.
LED on one of the power supplies lights—Check the fans and air filters
OVER TEMP
to be sure they are functioning and providing sufficient airflow through the chassis.
Check the LEDs on each three-phase delta or wye power supply faceplate.
2.
power supply LED is off—Check that the power supply is receiving voltage.
AC OK
power supply LED is blinking—Check the red alarm LED on the craft interface.
DC OK
LED on one or both of the power supplies is not lit—Check the power supply
DC OK
fans to see if they are operating.
OVER TEMP LED on one of the power supplies lights—Check the fans and air filters
to be sure they are functioning and providing sufficient airflow through the chassis.
Check the display on the craft interface to determine the source of a yellow or red
3.
alarm (see Table 38 on page 187). The Junos OS constantly updates the screen with
status information for each component.
NOTE: On the display and in the CLI, the power supplies are referred to
as and
PEM0
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 that case, the remaining power supply assumes the load, and
you can still view the system status through the CLI or display.
Verify that the source circuit breaker has the proper current rating.
4.
position (
ON
, from top to bottom.
PEM1
).
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