58 Rockwell Automation Publication 2198-UM002G-EN-P - February 2019
Chapter 2 Plan the Kinetix 5700 Drive System Installation
Table 20 - Shared DC-bus Terminology
The Kinetix 5700 DC-bus power is shared in the following ways:
• Across drive clusters by DC-bus links that are 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 D for
more information.
See Appendix C
beginning on page 391 for more information and sizing
examples.
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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