Rockwell Automation MDF-SB1304F Kinetix 6000M Integrated Drive-Motor System - Manual (Page 138)

138 Rockwell Automation Publication 2094-UM003A-EN-P - May 2012
Appendix D Kinetix 6000M System Sizing
Example
The six IDM units in this example are listed below with the corresponding
output power. The equation for bus current is used to calculate the bus current
values for each IDM unit. The DC bus voltage is 675V DC. The DC bus current
as a percentage of the IPIM module rating is 12.93 / 24 = 53.9%.
The DC bus current is less than the continuous current specification for the
IPIM module, so this is a valid system configuration.
Step 8: Estimate the IPIM module dissipation for the DC bus load
current and the total IPIM module dissipation from the IDM
unit control power and DC bus load current.
See the Kinetix Rotary Motion Specifications Technical Data, publication
GMC-TD001 for specifications on IPIM module dissipation. This information
is also shown in the equation below. This equation can be used to estimate the
dissipation, in Watts, of the IPIM module as a function of the DC bus load
current, expressed as a percentage of the maximum rating (24 A rms).
Dissipation = 33.95x
2
+ 3.18x
Combine the dissipation value calculated from this equation with the dissipation
from the total IDM system control power load current value from step 4. This is
the total dissipation for the IPIM module.
Repeat for each IPIM module.
Example
The DC bus current was calculated as 12.93 A, or 53.9% of the IPIM rating. The
dissipation for this DC bus current value is 11.7 W. The dissipation calculated for
the total IDM control power (step 4) is 29 W. Therefore the total dissipation for
the IPIM is 40.7 W.
IDM Unit Cat. No. with Brake Output Power Rating (kW) Estimated Bus Current (A rms)
MDF-SB1153 Yes 1.00 1.85
MDF-SB1003 No 1.10 2.04
MDF-SB1304 No 1.39 2.57
MDF-SB1304 Yes 1.24 2.30
MDF-SB1003 No 1.10 2.04
MDF-SB1153 No 1.15 2.13
Total 12.93