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Special Considerations for Elevated-Temperature Operation
This section provides information pertinent to users whose applications for
the MVME162LX Embedded Controller may subject it to high
temperatures.
The controller's design uses commercial grade devices. Therefore, it can
operate within an air temperature range of 0° C to 70° C. There are many
factors that affect the ambient temperature felt by components on the
controller: inlet air temperature; air flow characteristics; number, types,
and locations of IndustryPack modules; power dissipation of adjacent
boards in the system, etc.
A temperature profile of an MVME162LX Embedded Controller
(MVME162-223) was developed in an MVME945 12-slot VME chassis.
This board was loaded with one GreenSpring IP-Dual P/T module
(position a) and one GreenSpring IP-488 module (position b). One twenty-
five-watt load board was installed adjacent to each side of the board under
test. The exit air velocity was approximately 200 LFM between the
controller and the IP-Dual P/T module. Under these conditions, a 10° C
rise between the inlet and exit air was observed. At 70° C exit air
temperature (60° C inlet air), the junction temperatures of devices on the
controller were calculated (from the measured case temperatures) and did
not exceed 100° C.
The following are some steps that the user can take to help make elevated
temperature operation possible:
1. Position the MVME162LX Embedded Controller in the chassis for
2. Avoid placing boards with high power dissipation adjacent to the
3. Use low power IndustryPack modules only.
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maximum air flow over the component side of the board.
controller.
Introduction
1
1-9
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