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Thermal Alarm; Thermal Shutdown - IBM DCS9550 1S1 Installation & Service Manual

Storage expansion unit
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Table of Contents
Troubleshooting and Problem Solving
4.5.4

Thermal Alarm

1 Ops Panel FAULT
2 An AMBER LED on
3 Audible Alarm
4 Air temperature
4.5.5

Thermal Shutdown

An Enclosure will shut down when a critical temperature threshold is exceeded in order to
prevent permanent damage to the disk drives.
4.6
Drive Carrier Module Faults
Disk drive status is monitored by a Green LED and an Amber LED mounted on the front of
each Drive Carrier Module, providing the following indications:
Table 4–4
State
No drive fitted
Drive Power ON
Drive Activity
Drive Fault
Drive activity - LED may be off for a length of time during power up.
44
Symptom
Cause
If the internal
LED AMBER.
temperature measured in
the airflow through the
enclosure exceeds a pre-
one or more Power
set threshold a thermal
Supply/Cooling
alarm will sound.
Modules.
Sounding.
exiting PSU above
55°C.
Important
For thermal warnings please refer to the SES specification.
LED Functions
Green
Off
On
On/Blink off
On
IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide
Action
1 Check local ambient environment
temperature is below the upper 40°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.
Amber
Off
Off
Off
On

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