Allen-Bradley 2094-AC05-MP5 User Manual page 31

Table 11 - ControlLogix System Heat Dissipation Example
Enclosure
Description
Component
1756-M08SE 8-axis Sercos interface module
1756-L5563 L63 ControlLogix processor
1756-IB16D 16 -point input module
1756-OB16D 16 -point output module
1756-ENxTx EtherNet/IP communication module
Backplane total
1756-PB72 24V DC ControlLogix power supply
1756-A7 7-slot mounting chassis
Total ControlLogix system wattage
(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.
Figure 6 - ControlLogix Real Power
1756-P B72
1756-P B75
DC
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.
Metric
A =
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
surface of all six sides of an enclosure is calculated as:
A = 2dw + 2dh + 2wh
Where d (depth), w (width), and h (height) are in meters. Where d (depth), w (width), and h (height) are in inches.
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.
Rockwell Automation Publication 2094-UM001J-EN-P - March 2017
Plan the Kinetix 6000 Drive System Installation
Backplane Power Load
watts
3.2
4.5
0.84
4.64
4.0
17.18
N/A
N/A
75
Backplane
60
Power Load
45
30
(watts)
15
0
0
Standard English
0.38Q
1.8T - 1.1
Where T is temperature difference between inside air and
outside ambient (°F), Q is heat generated in enclosure
2
). The exterior (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) / 144
0.38 (612)
A =
1.8 (20) - 1.1
(1)
Heat Dissipation
watts
0
0
5.8
3.3
0
(2)
N/A
(2)
25
N/A
34.1
20 40 60 80 100
Real Power (watts)
4.08Q
A =
T - 1.1
2
= 6.66 m
Chapter 2
(1)
31