Recovering From An Overheated Power Supply And Fan Unit - IBM DS4800 Installation, User And Maintenance Manual

Table 38. Interconnect-battery unit LEDs (continued)
Legend
The Power, Overall DS4800 Configuration Needs Attention, and Locate LEDs are
general indicators for the entire DS4800 storage subsystem (or configuration, in the
case of the Overall DS4800 Configuration Needs Attention), not specifically for the
interconnect-battery unit. The Overall DS4800 Configuration Needs Attention LED
turns on if a fault condition is detected in any component in the storage subsystem
configuration, including all attached storage expansion enclosures. The Power,
Overall DS4800 Configuration Needs Attention, and Locate LEDs shine through the
front bezel.
Attention:
to the DS4000 Storage Manager client software to determine the problem with the
storage subsystem. Also, inspect the Needs Attention LEDs on the other
components in the storage subsystem to help isolate the fault to a specific
component.

Recovering from an overheated power supply and fan unit

The storage subsystem has two power supply and fan units. Each power supply
and fan unit contains a power supply, a cooling fan, a battery charger, and a built-in
temperature sensor designed to prevent the power supplies from overheating.
Under normal operating conditions, with an ambient air temperature range of 10° C
to 35° C (50° F to 95° F), the cooling fans maintain a proper operating temperature
inside the storage subsystem.
Several factors can cause the power supplies to overheat. These factors include the
following:
v Unusually high room temperature
v Fan failure
LED Color
4
Locate/ White LED
Identify Note: This
LED is
shown as
blue (and
displayed in
a different
order) when
the DS4800
bezel is
installed.
See "Front
bezel LEDs"
on page
118.
5
Service Blue LED
Action
Allowed
6
Battery Amber LED
Needs
Attention
If the Overall DS4800 Configuration Needs Attention LED lights, refer
Normal Status Problem Status/Procedure
Off On = storage subsystem locate
Off On = Safe to remove
See "Replacing the
interconnect-battery unit" on page
156.
Off On = Battery failed
See "Replacing a backup battery
pack" on page 160.
Chapter 4. Operating the storage subsystem
129