Rockwell Automation 2094-xMxx-S Kinetix 6000 Multi-axis Servo Drives User Manual - Manual (Page 31)

Rockwell Automation Publication 2094-UM001H-EN-P - June 2013 31
Planning the Kinetix 6000 Drive System Installation Chapter 2
Table 11 - ControlLogix System Heat Dissipation Example
Figure 6 - ControlLogix Real Power
For backplane power loading requirements of other ControlLogix power
supplies, refer to the ControlLogix Selection Guide, publication
1756-SG001 .
In this example, the amount of power dissipated inside the cabinet is the sum of
the Bulletin 2094 system value (578 W) and the ControlLogix system value
(34 W) for a total of 612 W.
With no active method of heat dissipation (such as fans or air conditioning)
either of these approximate equations can be used.
Total system watts dissipated (Q) was calculated at 612 W. The maximum
ambient rating of the Bulletin 2094 system is 50 °C (122 °F) and if the maximum
environmental temperature is 30 °C (86 °F), then T=20 in the equation below.
Enclosure Component Description
Backplane Power Load
(1)
watts
Heat Dissipation
(1)
watts
1756-M08SE 8-axis sercos interface module 3.2 0
1756-L5563 L63 ControlLogix processor 4.5 0
1756-IB16D 16 -point input module 0.84 5.8
1756-OB16D 16 -point output module 4.64 3.3
1756-ENxTx EtherNet/IP communication module 4.0 0
Backplane total 17.18
(2)
N/A
1756-PB72 24V DC ControlLogix power supply N/A 25
(2)
1756-A7 7-slot mounting chassis N/A N/A
Total ControlLogix system wattage 34.1
(1) For ControlLogix module specifications, refer to the ControlLogix Selection Guide, publication 1756-SG001 .
(2) Real power heat dissipation is determined by applying the backplane power load (17.18W) to the graph below.
75
60
45
30
15
0
0 2 0 4 0 6 0 8 0 100
Backplane
Power Load
(watts)
Real Power (watts)
1756-P B72
1756-P B75
DC
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 (612)
1.8 (20) - 1.1
= 6.66 m
2