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

•

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