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Example
Example System:
• Common bus leader IAM module
• Two AM modules
• One IPIM module
• Six IDM units (shown below)
• 72 total meters of hybrid cable
• Control power = 120V AC, 60 Hz
• Main power = 480V AC => 675V DC
For this example, assume that each digital input uses 50 mA at 24V DC.
IDM Unit Cat.
Digital
with
No.
Inputs
Brake
MDF-SB1153
2
MDF-SB1003
0
MDF-SB1304
3
MDF-SB1304
0
MDF-SB1003
0
MDF-SB1153
2
The total IDM control power load is less than the specified limit for the IPIM so
this is a valid system configuration.
Step 2: Estimate the IDM system control power load current for all
IDM units connected to each IPIM module.
Estimating the load current for each IDM depends on the IDM control power
voltage applied to each IDM. The loads calculated in step 1 are specified in watts,
so the load current is estimated as:
Where:
I
= IDM unit control power load current for IDM i
i
W
= load watts for IDM i
i
V
= voltage applied to IDM i
i
I
= Total IDM unit control power load current out of the IPIM
L
Rockwell Automation Publication 2094-UM003A-EN-P - May 2012
Constant Load
Dig Input Load
(W)
(W)
Yes
8
3.0
No
8
0
No
8
4.5
Yes
8
0
No
8
0
No
8
3.0
Total IDM Unit Control Power Load
W
i
I
=
i
V
i
= ∑ I
I
L
i
Kinetix 6000M System Sizing
Appendix D
Brake Load
Total Load
(W)
(W)
19.5
30.5
0
8
0
12.5
19.5
27.5
0
8
0
11
97.5
129
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