24 Rockwell Automation Publication 2099-UM001G-EN-P - December 2022
Chapter 2 Install the Kinetix 7000 Drive System
In this example, the amount of power that is dissipated inside the cabinet is the
sum of the Kinetix 7000 drive (2099-BM08-S and 2099-BM11-S) system value
(1727 W) and the ControlLogix value (34.1 W) for a total of 1761 W.
With no active method of heat dissipation (such as fans or air conditioning)
either of the following approximate equations can be used.
The maximum ambient rating of the Kinetix 7000 drive is 50 °C (122 °F) and if
the maximum environmental temperature is 30 °C (86 °F) then Q=1761 and
T=20 in this equation.
In this example, the enclosure must have an exterior surface of 19.2 m
2
. If any
portion of the enclosure is not able to transfer heat, it should not be included in
the calculation. For instance, if an externally mounted shunt system is used with
the Kinetix 7000 system, it should not be included in the equation.
The minimum enclosure size must take into account the physical size and
minimum clearance requirements of the two Kinetix 7000 drives and the
additional ControlLogix and other devices that are required to meet the
application needs.
If the enclosure size is considerably larger than what is necessary to house the
system components, it may be more efficient to provide a means of cooling in a
smaller enclosure. Contact your enclosure manufacturer for options available to
cool your enclosure.
Metric Standard English
Where T is temperature difference between inside air and
outside ambient (°C), Q is heat that is 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 that is 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–
----------------=
A =
0.38 (1761)
1.8 (20) - 1.1
A =
19.2 m
2
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