Installation guide
INTRODUCTION
14
Note:
A power supply/cooling fan module can be removed from a
powered-on enclosure; however, the expander controller may
automatically shut down the enclosure if overheating occurs.
The power supply cooling shall be provided by the internal tandem
fans, powered by the common 12V rail voltage. Fan speed is con-
trolled by PWM input signal. And the power supply rmware shall
determine the fan RPM required to provide forced air cooling using
data from a thermal sensor in the power supply that reects the
output loading.
The cooling fans included on the power supply run on separate con-
trol circuits from the power supply. Therefore, if one power supply
fails, the failed power’s fan continues to work on the power sup-
plied from the other good power supply.
1.4 SAS RAID Subsystem Alarm
An audible alarm is activated if any of the fault conditions occur,
such as Voltage, Temperature, Fan, Power Supply or from SES2.
The “Alert Beeper Setting” function on the RAID System Function
is used to disable or enable the RAID subsystem alarm tone
generator. The “Mute The Alert Beeper” function on the "RAID
System Function" is used to control the Fibre/SAS/iSCSI to 6Gb/s
SAS RAID subsystem beeper. It turns the beeper off temporarily.
The beeper will still activate on the next event.
Power LED Status Indication
AC_OK (Green LED)
The AC_OK LED indicates that the AC line is present and
above the minimum AC input voltage threshold
FAULT (Red LED) The FAULT LED is driven by the microprocessor and will
indicate that a power supply fault has occurred.
The following table describes the power LEDs status.