
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 |
|
|
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 |
| 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 |
|
|
Temperature Sensitivity, typical | 100 mV per ° C, 0° C rise corresponds to 0 V output. |
|
|
VX1410A & VX1420A IntelliFrame Mainframe Instruction Manual | 4±5 |