Keysight M9502A, Руководство пользователя

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Keysight M9502A/M9505A AXIe Chassis User Guide 55
Chassis Health Page Navigating the Web Interface
Cooling Status
The shelf manager continuously monitors reported module
temperatures, looking for indication that one or more modules is outside its
optimal temperature range. This range is specified by the module vendor, as are
the thresholds for alarm conditions. Typically only high temperatures generate
an alarm, although it is possible for a vendor to specify low temperature alarm
levels as well.
In the event of a high temperature alarm from any module, the shelf manager
responds by increasing chassis fan speed and continuing to monitor. If the Upper
Non-Recoverable threshold is reached, the shelf manager requests the module
to power down to its inactive state. Because this level is set by the module
vendor, it may not indicate that the module has failed, only that continued
operation is inadvisable until the module cools.
Current Speed Level
This is the level the fans are currently operating and is
controlled by the Shelf Manager. It increases from a set minimum as needed to
adjust for changes in chassis temperature. The range is from 35 to 100, where 35
is the slowest speed level and 100 is the highest speed level. The Current Speed
Level indicates an approximate percentage of maximum fan RPM. Therefore, a
level of 40 indicates the fans are operating at approximately 40% of maximum
RPM, and 100 indicates the fans are operating at 100% of maximum RPM. Note,
the default/reset value is 40.
Dynamic Minimum Fan Level
This is the minimum fan level the shelf manager
algorithm sets as it actively monitors the overall system temperature and
temperature threshold events received from instrument modules. Over time, the
algorithm adjusts this level towards the user-specified minimum fan level
provided the cooling status remains at Normal.
Adjust Current Speed Level and Dynamic Minimum Fan Level
This user
adjustable parameter actually sets both values. This level is kept in non-volatile
RAM until you change it; cycling power to the chassis does not change the
minimum fan level. Adjust the minimum fan level by entering a value in the field,
or clicking the up/down arrows, and then clicking the
Apply button.
Note that you can individually set the Current Speed Level and the Dynamic
Minimum Fan Level using ICI controls. The Web UI (and the Soft Front Panel)
binds these two together. Setting the Current Speed Level is always temporary
because the Dynamic Minimum Fan Level algorithm continuously adjusts the fan
speed towards a dynamic minimum when cooling conditions permit. For
example, consider a situation where the chassis and installed modules require a
fan speed of 50 to maintain proper cooling. If you attempt to manually set the
Current Fan Speed to a lower value (40 for example) the algorithm overrides the
setting and maintains the fan speed to provide adequate cooling. Conversely, if
you manually set the fan speed to a higher value (65 for example), the algorithm
sets that fan speed and does not change it unless additional cooling becomes
required.