64 Rockwell Automation Publication ICSTT-RM448M-EN-P - February 2021
Chapter 4 Before You Begin
Estimate Heat Dissipation
The heat in the enclosure is generated from several sources such as the power
supplies, the AADvance modules and some of the field loop power. Use the
following calculation and the data given in the tables to estimate the overall
heat dissipation:
• Power supply consumption (Watts x (100-efficiency) (%) + the sum of the
system power consumed by the modules + part of the field power that is
in the enclosure.
The following module power dissipation values are worst case values over the
range of operating voltages and currents.
The field loop power heat dissipation is generated from the input voltages and
currents + the output currents:
1
The maximum field loop power heat dissipation for analogue outputs should
be calculated at an output current corresponding to the smaller of the
Maximum Channel Output Current OR Field Voltage/(2 x Load Resistance)
Estimate AADvance
Controller Weight
Use the following table to make an estimate of the weight of your controller.
Table 7 - Module Supply Power Heat Dissipation
Item
Number of
Modules
Module Power
Heat Dissipation
Subtotal
(W/BTU/hr)
T9110 Processor Module × 8.0 W (27.3 BTU/hr.) =
T9401 Digital Input Module 24 Vdc, 8 channel × 3.3 W (11.3 BTU/hr.) =
T9402 Digital Input Module 24 Vdc, 16 channel × 4.0 W (13.6 BTU/hr.) =
T9431 Analogue Input Module, 8 channel × 3.3 W (11.3 BTU/hr.) =
T9432 Analogue Input Module, 16 channel × 4.0 W (13.6 BTU/hr.) =
T9451 Digital Output Module, 24 Vdc, 8 channel × 3.0 W (10.2 BTU/hr.) =
T9482 Analogue Output Module, 8 channel,
isolated
× 3.6 W (12.3 BTU/hr.) =
Total:
Table 8 - Field Loop Power Heat Dissipation
Item
Number of
Field Loops
Field Loop Power
Heat Dissipation
Subtotal
(W x 3.412 BTU/hr)
Digital Inputs × Input Voltage (V)/5125 =
Analogue Inputs × Input current (A) x 135 =
Digital Outputs x Output current (A) x 0.57 =
Analogue outputs
x (Field voltage(V) x Output
Current (A) - load Resistance
() x Output current (A)
1
=
Total:
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