Rockwell Automation 141A Mounting System Temperature Rise Calculation Software Tutorial User Manual
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In our Example, the calculation shows an excess heat dissipation of 60 W, which would cause a
temperature excess of 4 °C on top of the enclosure.
Let’s try diff erent measures to solve this issue. Make sure you change the settings back to the
original values before trying each solution.
Select a bigger enclosure. If you are not limited by space, this is a very effi
cient method
•
without an infl uence to the ingress protection level of the enclosure type.
–
Go back to the “Enclosure” tab and try it.
For example, an enclosure of
1,000 x 1,600 x 500 solves the issue.
Install air inlet / outlet openings. Air inlet openings of 50 cm
•
2
would solve the issue. It needs
to be more if the effi
ciency is reduced by a fi lter. Th
is measure is not applicable if a high
ingress protection level is required.
Note: Th
e outlet openings need to be at least 1.1 x the cross-section of the inlet openings.
–
Go back to the “Enclosure” tab and try it. Activate the check box “Air inlet opening”
Verify with the customer if the rated ambient temperature must be 35 °C. A reduction to
•
30 °C would solve the issue.
–
Go back to the “Environmental Conditions” tab and try it.
Verify with the customer if the Reduction Factor for the components (or some of them) can be
•
reduced. Experience shows that in many applications the Simultaneity Factor is < 50%.
Note: See User Manual or Help fi le and IEC 60439 / IEC 61439 for more information about
the Reduction Factor
–
Go back to the “Enclosure” tab and select the [ Evaluate ] button. Test how changes in
the Reduction Factor infl uence the power loss.
2.4.1
Measures to Take
in Case of Heat
Dissipation Excess