Rockwell Automation 2099-BMxx Kinetix 7000 High Power Servo Drive User Manual - Manual (Page 26)

26 Rockwell Automation Publication 2099-UM001D-EN-P - December 2012
Chapter 2 Install the Kinetix 7000 Drive System
In this example, the amount of power 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 the equation below.
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 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 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 (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