Rockwell Automation Publication DRIVES-AT005D-EN-P - May 2022 9
Chapter 1
DC Bus Wiring Guidelines
This section provides guidelines for DC bus wiring of common bus systems.
Drive Line-up
Generally, it’s desirable to have the drive line-up match the machine layout. However, if a mix of drive frame sizes is used in the line-up, the system
layout requires the largest drives to be located closest to the rectifier source. The rectifier source can be anywhere within the system line-up. Often,
it’s advantageous to place the rectifier in the middle of the line-up to minimize the distance to the farthest loads. Shorter distances can minimize
the energy that is stored in the parasitic inductance of the bus structure, which helps to lower peak bus voltages and mitigate voltage transients
during operation.
To minimize system inductance, Rockwell Automation recommends that the system DC bus remains uninterrupted. The use of cables to connect
additional drive system cabinets to the system bus isn’t recommended.
Figure 1 - Example System (shown for illustrative purposes only)
Item Description Item Description Item Description
1 Frame 10 PowerFlex® 755TM regenerative bus supply 5 Kinetix® 5700 servo drive cluster 9 Line side converter
2 Frame 8 PowerFlex 755TM common bus inverter 6 Control pod 10 Motor side inverter
3 Control bay 7 AC precharge module 11 DC precharge module (optional)
4 PowerFlex 750-Series drives (frames 1…7 only) 8 Line side converter
1 2 23 4 5
9 9
8 8 86 6
6
7
10
11 11
10
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