Lacie 12big Rack Network User Manual - Page 33

Thermal Monitoring and Control, Thermal Alarm

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LaCie 12big Rack Network User Manual Troubleshooting & Problem Solving page 33 4.5.4. Thermal Monitoring and Control The LaCie 12big Rack Network enclosure uses extensive thermal monitoring and takes a number of actions to ensure component temperatures are kept low and also to minimize acoustic noise. Air flow is from front to rear of the enclosure. Table 16 - Thermal Monitoring and Control Symptom If the ambient air is cool (below 25 °C) and the fans are observed to increase in speed then some restriction on airflow may be causing additional internal temperature rise. Note: This is not a fault condition. Cause Action The first stage in the thermal control process is for the fans to automatically increase in speed when a thermal threshold is reached. This may be caused by higher ambient temperatures in the local environment and may be perfectly normal. Note: This threshold changes according to the number of drives and power supplies fitted. 1. Check the installation for any airflow restrictions at either the front or rear of the enclosure. A minimum gap of 25mm at the front and 50mm at the rear is recommended. 2. Check for restrictions due to dust build-up; clean as appropriate. 3. Check for excessive re-circulation of heated air from rear to the front, use in a fully enclosed rack installation is not recommended. 4. Check that all Blank modules are in place. 5. Reduce the ambient temperature. 4.5.5. Thermal Alarm Table 17 - Thermal Alarm Symptom Cause 1. Ops Panel UNIT FAULT LED amber. 2. An amber LED on one or more Power Supply Units. If the internal temperature measured in the airflow through the enclosure exceeds a pre-set threshold a thermal alarm will sound. Action 1. Check local ambient environment temperature is below the upper 35°C specification. 2. Check the installation for any airflow restrictions at either the front or rear of the enclosure. A minimum gap of 25mm at the front and 50mm at the rear is recommended. 3. Check for restrictions due to dust build-up, clean as appropriate. 4. Check for excessive re-circulation of heated air from rear to the front, use in a fully enclosed rack installation is not recommended. 5. If possible shutdown the enclosure and investigate the problem before continuing.

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LaCie 12big Rack Network
Troubleshooting & Problem Solving
User Manual
page 33
4.5.4.
Thermal Monitoring and Control
The LaCie 12big Rack Network
enclosure uses extensive thermal
monitoring and takes a number of actions to ensure component
temperatures are kept low and also to minimize acoustic noise. Air
flow is from front to rear of the enclosure.
Table 16 - Thermal Monitoring and Control
Symptom
Cause
Action
If the ambient air is cool
(below 25 °C) and the fans
are observed to increase in
speed then some restriction
on airflow may be causing
additional internal tempera-
ture rise.
Note: This is not a fault
condition.
The first stage in the thermal control process
is for the fans to automatically increase in
speed when a thermal threshold is reached.
This may be caused by higher ambient
temperatures in the local environment and
may be perfectly normal.
Note: This threshold changes according to
the number of drives and power supplies
fitted.
1. Check the installation for any airflow restrictions at ei-
ther the front or rear of the enclosure. A minimum gap
of 25mm at the front and 50mm at the rear is recom-
mended.
2. Check for restrictions due to dust build-up; clean as
appropriate.
3. Check for excessive re-circulation of heated air from
rear to the front, use in a fully enclosed rack installation
is not recommended.
4.
Check that all Blank modules are in place.
5. Reduce the ambient temperature.
4.5.5.
Thermal Alarm
Table 17 - Thermal Alarm
Symptom
Cause
Action
1. Ops Panel UNIT FAULT
LED amber.
2. An amber LED on one or
more Power Supply Units.
If the internal temperature measured in
the airflow through the enclosure exceeds
a pre-set threshold a thermal alarm will
sound.
1.
Check local ambient environment temperature is below
the upper 35°C specification.
2. Check the installation for any airflow restrictions at ei-
ther the front or rear of the enclosure. A minimum gap
of 25mm at the front and 50mm at the rear is recom-
mended.
3. Check for restrictions due to dust build-up, clean as
appropriate.
4. Check for excessive re-circulation of heated air from
rear to the front, use in a fully enclosed rack installation
is not recommended.
5. If possible shutdown the enclosure and investigate the
problem before continuing.