Rockwell Automation MDF-SB1304F Kinetix 6000M Integrated Drive-Motor System User Manual
Page 137
Rockwell Automation Publication 2094-UM003A-EN-P - May 2012
137
Kinetix 6000M System Sizing
Appendix D
Step 6: Determine if a LIM can be used to supply the IAM control
power load current, or if individual discrete components
must be used.
In order to use a LIM for the control power interface to the IAM, the control
power load current calculated in step 5 must be less than the values listed in the
Line Interface Module (LIM) Installation Instructions, publication
.
If control power load current exceeds the LIM rating, separate discrete
components must be used for filtering, fusing and disconnection of control
power. Refer to the Kinetix 6000 Multi-axis Servo Drives User Manual,
publicatio
or the Kinetix 6200 and Kinetix 6500 Modular Multi-
axis Servo Drives User Manual, publication
for further
information,
Step 7: Estimate the DC bus load current for each IPIM.
One method to estimate the DC bus load current is to analyze the motion profile
of each IDM unit axis and estimate the RMS power per motion cycle. Motion
Analyzer performs this analysis, and it can be challenging for complex motion
profiles. Another option is to use the continuous output power specification for
each IDM unit. Once an output power value is determined for each IDM unit,
use the equation below to calculate a DC bus load current value for each IDM
unit. This equation neglects the effect of voltage drop over the hybrid cable DC
bus. However this affect is much less significant compared to the IDM control
power voltage drop so ignoring it does not have a large impact on the estimation.
Where:
I
bus
= IDM unit DC bus current load
P
out
= IDM unit average shaft output power
η
= efficiency, 80% (average)
V
bus
= DC bus voltage at the IPIM nodule
Calculate the total bus current by summing the I
bus
current values for all the
IDM units connected to an IPIM module.
IMPORTANT
The total bus current must be less than the maximum current specification for
the IPIM module (24 A rms). See the Kinetix Rotary Motion Specifications
Technical Data, publication
GMC-TD001
.
I
bus
=
η
* V
bus
P
out