Rockwell Automation 1398-DDM-xxx ULTRA 100 Series Drives Installation Manual - Manual (Page 292)

Publication 1398-5.2 – PDF 1997
G-6 Specifications
T = 4.08 * (Q/A) + 1.1
where:
T = Temperature difference between inside air and outside ambient ( ° F)
Q = Heat generated in enclosure (watts)
A = Enclosure surface area in ft.
2
= (2dw + 2dh + 2wh) / 144
d = Depth in inches
h = Height in inches
w = Width in inches