Harmonic MediaGrid, Руководство по установке и настройке

Страница: 293 / 358

Chapter 9 Troubleshooting
© 2017 Harmonic Inc. All rights reserved. 293 Harmonic MediaGrid Release 4.1
Troubleshooting the ContentStore 5840
Thermal Alarm
Symptom Cause Action
If the ambient air is 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.
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.

Check the installation for any airflow
restrictions at either the front or rear of
the enclosure. A minimum gap of 25
mm at the front and 50 mm at the rear
is recommended.

Check for restrictions due to dust
buildup. Clean as appropriate.

Check for excessive re-circulation of
heated air from rear to the front. Use
of the enclosure in a fully enclosed
rack is not recommended.

Check that all blank modules are in
place. Reduce the ambient
temperature.
Symptom Cause Action

Operator’s panel module
fault LED is amber.

Fan fail LED is lit on one
or more cooling modules.
The internal temperature has
exceeded a pre-set
threshold.

Check that the local ambient
environment temperature is below the
specification (see
Temperature and
Humidity ).

Check the installation for any airflow
restrictions at either the front or rear of
the enclosure. A minimum gap of 25
mm at the front and 50 mm at the rear
is recommended.

Check for restrictions due to dust
buildup. Clean as appropriate.

Check for excessive re-circulation of
heated air from rear to the front. Use
of the enclosure in a fully enclosed
rack is not recommended.

If possible shutdown the enclosure
and investigate the problem before
continuing.