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Cooling Specifications
Cooling Modes
Airflow Path
52 Specifications
High performance impeller provides cooling air to modules. Unique air
distribution system (patent applied for) and pressurized plenum provides
quiet operation and uniform airflow from front to rear of modules. Separate
power supply cooling fan provides an independent air path for reliable
cooling of power supply.
High or variable cooling mode switchable on the front panel. Controls both
impeller and power supply fan.
High Fan Speed Mode: full airflow at all times.
Variable Fan Speed Mode: fan speed increments through 5 discreet speeds
as a function of power supply and reference temperatures (pins 11, 12 of
diagnostic connector). Reference temperature is a function of load and
ambient temperature.
At full load:
n
low speed up to approximately 25
n
high speed above approximately 40
At no load:
n
low speed up to approximately 38
n
high speed above approximately 53
If power supply temperature exceeds a set limit, fan speed will
increase.
At low fan speed, airflow is approximately 60% of high fan speed.
For VXI module cooling, air enters through the back of the mainframe and
exhausts out the sides.
For power supply cooling, air enters through the right side (when viewed
from front) and is exhausted through the left side.
An Air Filter Kit is available for demanding environmental applications.
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Appendix A
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