Rockwell Automation 8720MC High Performance Drives Installation Manual - Manual (Page 21)

Publication 8720MC-IN001D-EN-P — December 2002
Installing Your 8720MC Drive 1-9
Sizing an Enclosure
If you are supplying your own enclosure for the 8720MC drive, you
can mount your drive within an enclosure or you can mount the drive
and let the heat sink extend outside the enclosure.
With no active method of heat dissipation (such as fans or air
conditioning) either of the following approximate equations can be
used:
Contact your cabinet manufacturer for options available to cool your
cabinet. Refer to Power Dissipation Specifications in Appendix A.
Metric Standard English
Where T is temperature difference between
inside air and outside ambient (°C), Q is heat
generated in enclosure (Watts), and A is
enclosure surface area (m²). The exterior surface
of all six sides of an enclosure is calculated as Where T is temperature difference between
inside air and outside ambient (°F), Q is heat
generated in enclosure (Watts), and A is
enclosure surface area (ft²). The exterior surface
of all six sides of an enclosure is calculated as
A = 2dw + 2dh + 2wh A = (2dw + 2dh + 2wh) / 144
Where d (depth), w (width), and h (height) are in
meters. Where d (depth), w (width), and h (height) are in
inches.
A
0.38Q
1.8T 1.1 –
------------------------ = A
4.08Q
T 1.1 –
---------------- =