Specifications

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.

 

 

VX1410A & VX1420A IntelliFrame Mainframe Instruction Manual

4±5