20 Rockwell Automation Publication 2071-UM001E-EN-P - November 2013
Chapter 2 Install the Kinetix 3 Drive System
Sizing the Enclosure
This example is provided to assist you in sizing an enclosure for your
Bulletin 2071 drive system. You need heat dissipation data from all components
planned for your enclosure to calculate the enclosure size. See Power Dissipation
Specifications on page 21 for the Kinetix 3 drive power dissipation.
With no active method of heat dissipation (such as fans or air conditioning)
either of these approximate equations can be used.
If the maximum ambient rating of the Kinetix 3 system is 50 °C (122 °F) and if
the maximum environmental temperature is 30 °C (86 °F) then Q=416 and
T=20 in the equation below.
In this example, the enclosure must have an exterior surface of 4.53 m
2
. If any
portion of the enclosure is not able to transfer heat, it do not be included in the
calculation.
Because the minimum cabinet depth to house the 230V drive (selected for this
example) is 200 mm (7.9 in.), then the cabinet needs to be approximately 2000
mm (high) x 850 mm (wide) x 200 mm (deep).
2 x (0.2 x 0.85) + 2 x (0.2 x 2.0) + 2 x (0.85 x 2.0) = 4.54m
2
Because this cabinet size is considerably larger than what is necessary to house the
system components, it can be more efficient to provide a means of cooling in a
smaller cabinet. Contact your cabinet manufacturer for options available to cool
your cabinet.
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 (m
2
). 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 (ft
2)
. 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 =
0.38(416)
1.8(20) -1.1
~ 4.5 m
2
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