Rockwell Automation MDF-SB1304F Kinetix 6000M Integrated Drive-Motor System - Manual (Page 131)

Rockwell Automation Publication 2094-UM003A-EN-P - May 2012 131
Kinetix 6000M System Sizing Appendix D
• Dividing the total IDM unit load power by 42V DC assumes that all the
IDM units are at the IPIM module and experience no voltage drop from
the hybrid cable. This is a very liberal method that always results in an
underestimate of the load current.
• Dividing the total IDM unit load power by 37V DC represents more of an
average situation where all the IDM units experience half the maximum
voltage drop. This is a reasonable compromise between the other two
extremes.
Repeat this procedure for all IPIM modules connected to the power rail.
Example
Using the three equations from this step, the following IDM unit control power
load currents are calculated.
The IDM unit control power current load is less than the specified limit for the
IPIM module for all the load current estimates, so this is a valid system
configuration.
IMPORTANT Confirm that the IDM control power current load is less than the specified limit
for the IPIM module (6.5 A). See the Kinetix Rotary Motion Specifications
Technical Data, publication
GMC-TD001 .
IDM Unit Control Power Voltage
Estimate (V DC)
IDM Unit Control Power Load Current
(A)
32 3.05
37 2.64
42 2.32
∑ W
i
V
32
I
L
=
∑ W
i
V
37
I
L
=
∑ W
i
V
42
I
L
=