Rockwell Automation Publication 2198-UM002L-EN-P - October 2021 55
Chapter 2 Plan the Kinetix 5700 Drive System Installation
Multi-axis Shared DC-Bus Configurations
The Kinetix 5700 shared DC-bus can be supplied by the following sources:
•Single 2198-Pxxx DC-bus power supply
• Multiple 2198-P208 DC-bus power supplies (up to three are possible)
•Single 2198-RPxxx regenerative bus supply
• Multiple 8720MC-RPS regenerative power supplies
The Kinetix 5700 DC-bus power is shared in the following ways:
• Across drive clusters by DC-bus links (included with the drive module).
• From the power supply cluster to an extended cluster by connection
points provided on accessory modules.
System Sizing Considerations
Multi-axis Kinetix 5700 shared-bus drive systems require thorough evaluation
to make sure each drive will perform as expected. Consider the following when
sizing your system to determine the appropriate configuration:
Consider the following to determine your system configuration:
• Determine motor/drive combinations for full-motor performance
• No more than three 2198-P208 DC-bus power supplies can be used to
increase the converter power
• Define the DC-bus groups
• Calculate system and external-bus capacitance
• Calculate the total motor-power cable length
• Calculate the 24V DC control-power current demand
• If using the 24V DC shared-bus connection system to distribute control
input power to a cluster of drive modules, current from the 24V power
supply must not exceed 40 A
• Calculate the 24VDC voltage drops
• Minimize drive-to-motor cable lengths. Overall system design can
significantly limit the drive-to-motor cable lengths.
See Appendix C
on page 373 for more information and sizing examples. See
Appendix D
on page 383 for more information on cable lengths.
Table 21 - Shared DC-bus Terminology
Term Definition
DC-bus group Drive modules that are all connected to the same DC bus.
Cluster
Group of power supply and/or drive modules that are directly connected together via
Kinetix 5700 DC bus-bars only.
Extended cluster
Group of drive modules that are directly connected together via Kinetix 5700 DC bus-bars
and connected to the power supply cluster via customer-supplied DC-bus cable.
Power supply cluster The cluster that contains the AC to DC converter (power supply).
Extended DC-bus
When 2 drive clusters are part of the same DC-bus group joined by the DC bus-bars and
customer-supplied DC-bus cable.
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