Table 95: T640 Cooling System Alarm Messages - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide

Table 95: T640 Cooling System Alarm Messages

Component Alarm Type
Fans Red
Yellow
470
The following alarms, LEDs, and other conditions indicate a problem with the cooling
system:
A red alarm indicates that temperature of the router exceeds the maximum
("temperature hot") threshold.
Automatic shutdown of the power supplies was caused by the temperature of the
router exceeding the maximum ("temperature hot") threshold. The control board turns
off the power supplies because the router temperature exceeds the acceptable
maximum.
A red alarm indicates that a fan failed.
A yellow alarm indicates that the router temperature exceeds the "temperature warm"
threshold.
A yellow alarm indicates that one of the fan trays was removed.
One or more fans in a fan tray function at full speed. The control boards constantly
monitor the temperatures detected by sensors on the midplane and router components,
adjusting the speed of the fans as necessary.
In Table 95 on page 470, the text in the column labeled "LCD Message" appears in the
display of the craft interface. The text in the column labeled "CLI Message" appears in
the output from the
show chassis alarms
LCD Message
Fan Failure
Fans Missing
Fan Removed
Mix of FAN-TRAYS
command.
CLI Message Alarm Condition
A fan has failed.
fan-name Failure
A fan tray is missing
Too many fans missing
or too many fan
or failing
trays have failed.
A fan tray has been
fan-name Removed
removed.
A mix of standard
Minor – Mix of
front fan trays and
FAN-TRAYS
quiet front fan trays
are installed in the
chassis.
NOTE:
normal operations,
mixing the standard
and quiet fan trays
is not supported.
Solution
Replace the fan
tray.
Reinstall the fan
tray in the chassis.
Reinstall the fan
tray in the chassis.
Check that all fan
trays are either
standard fan trays
or quiet fan trays.
Install the correct
fan trays.
During
NOTE: During an
upgrade, ignore
this alarm.
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