Chapter 4 - Managing and Monitoring
Enclosure Fan Speed Control
122
Enclosure Fan Speed Control
The SES Controller card has a firmware-based VT-100 interface which provides an
option for fan speed control. This allows the user with the choice to enable or
disable the automatic control feature. It provides for more efficient management
of the cooling fans and a whisper mode fan operation for noise sensitive
environments where it significantly reduces the noise created by the cooling fans
running constantly at full speed. Under normal conditions it is not necessary to
run the cooling fans at full speed.
When this option is enabled, the software will control the RPM of the cooling
fans based on enclosure temperature parameters and its installed component.
For example, if any one or a combination of the following occurs, the cooling fan
RPMs will be set to the maximum software controlled RPM: a disk drive is
removed from any of the drive slots 4 through 9, a power supply is removed, one
of the cooling fans in the cooling fan module fails, a temperature sensor fails, or
a SES processor fails.
Fan Speed Setup Screen
A manual override of the fan speed control is available for special circumstance
environments. Referring to the illustration on the following page, two jumpers are
provided on the fan module printed circuit board to override the firmware
control of the fan speeds.
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Summary of Contents for IRF-1D series
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