Specifications

Publication 1747-SG001E-EN-E - February 2013
90 Select SLC 500 Power Supplies
Heat Dissipation Worksheet Example
Procedure for calculating the total heat dissipation for the controller
1. Write the total watts dissipated by the processor, I/O, specialty modules, and any peripheral devices attached to the processor.
3 rebmuN sissahC2 rebmuN sissahC1 rebmuN sissahC
Slot Cat. No. Heat Dis (Watts) Slot Cat. No. Heat Dis (Watts) Slot Cat. No. Heat Dis (Watts)
0 1747-L511 1.75 4 1746-IA16 4.8
1 1746-BAS 3.8 5 1746-IA16 4.8
2 1746-IAB 2.4 6 1746-OW16 5.5
3 1746-OV8 6.9 7 1746-OW16 5.7
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2. Add the heat dissipation values
together for your total chassis heat
dissipation.
17.35
2. Add the heat dissipation values together
for your total chassis heat dissipation.
20.8
2. Add the heat dissipation values together
for your total chassis heat dissipation.
3. Calculate the power supply loading for each chassis (minimum watts) for each device.
3 rebmuN sissahC2 rebmuN sissahC1 rebmuN sissahC
Slot Cat. No. Heat Dis (Watts) Slot Cat. No. Heat Dis (Watts) Slot Cat. No. Heat Dis (Watts)
0 1747-L511 1.75 4 1746-IA16 0.425
1 1746-BAS 3.75 5 1746-1A16 0.425
2 1746-IA8 0.25 6 1746-OW16 5.17
3 1746-OV8 0.675 7 1746-OW16 5.17
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4. Add the heat dissipation values
together for your power supply loading.
8.925
4. Add the heat dissipation values together
for your power supply loading.
13.59
4. Add the heat dissipation values together
for your power supply loading.
5. Use the power supply loading (step 4)
for each chassis and the graphs on page
76 to determine power supply dissipation.
13.0
5. Use the power supply loading (step 4) for
each chassis and the graphs on page 76 to
determine power supply dissipation.
15.0
5. Use the power supply loading (step 4) for
each chassis and the graphs on page 76 to
determine power supply dissipation.
6. Add the chassis dissipation (step 2) to
the power supply dissipation (step 5).
30.35
6. Add the chassis dissipation (step 2) to the
power supply dissipation (step 5).
35.8
6. Add the chassis dissipation (step 2) to the
power supply dissipation (step 5).
7. Add the values together from 6 step across to the right. 66.15
8. Convert value from step 7 to BTUs/hr by multiplying total heat dissipation of controller by 3.414. 225.84
If you have a device connected to user power, multiply 24V dc by the amount of current used by that device. Include user power in the total power supply loading.