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VX1410A & VX1420A IntelliFrame Mainframe Instruction Manual
4–5
Table 4–3: Cooling
Characteristic Description
Cooling System VX1410A: Forced air circulation (positive pressurization)
with one removable filter. Two internal DC fans provide
cooling for the power supply and the 13 VXIbus module
slots.
VX1420A: Forced air circulation (positive pressurization)
with two removable filters. One DC fan provides cooling for
the power supply and 13 VXI module slots.
Fan Speed Control Slot exhaust air and ambient air temperature are
monitored such that a maximum ∆Temperature is
maintained. Rear Panel switch chooses between full
speed and variable speed.
Slot Activation Installing a VXIbus module activates the cooling for the
corresponding occupied slots by opening the IntelliGuide
mechanism. Only provides cooling to installed modules.
Slot Airflow Direction P2 to P1, bottom of module to the top of module.
Mainframe Intake VX1410A: Lower rear of mainframe.
VX1420A: Bottom rear and lower rear of mainframe.
Mainframe Exhaust Top rear and top sides of mainframe.
Cooling Clearance Two inches on both sides and rear of mainframe.
Pressurization Positive (modules pressurized).
Filter Access VX1410A: Single air filter accessible from rear of the
mainframe.
VX1420A: Dual air filters accessible from rear of the
mainframe.
Temperature Readout Readout of intake air temperature and individual slot
exhaust temperature through VXIbus or RS-232.
Fan Speed Readout VX1410A: RPM = 30 *(Tach Frequency) or
RPM =15 /(+Pulse Width), where (+Pulse Width) is the
positive pulse width of either of the Tach1 or Tach2 fan
output signals.
Readout of system fan speed through VXIbus or RS-232.
VX1420A: RPM = 20 *(Tach Frequency) or
RPM = 10/(+Pulse Width) where (+Pulse Width) is the
positive pulse width of the Tach 1 fan output signal
measured in seconds.
Readout of system fan speed is also available via VXIbus
and RS-232 with Enhanced Monitoring.
∆Temperature Sensitivity, typical 100 mV per ° C, 0° C rise corresponds to 0 V output.