10 Rockwell Automation Publication DRIVES-AT005D-EN-P - May 2022
Chapter 1 DC Bus Wiring Guidelines
DC Bus Connections
The interconnection of drives to the DC bus, and the inductance levels between the drives, must be kept to a minimum for optimum system
operation.
Bus Bar Versus Cable
Continuous bus bar is required. When using cables to connect drives to the system bus within a cabinet, adhere to the following guidelines:
• Keep the cable lengths as short as possible.
• Twist cable where possible, approximately one twist per foot.
• Use cable that is appropriately rated for the voltage class of the product.
• The DC bus connections can’t be ‘daisy chained’. Use a ‘star’ configuration of the DC bus connections as shown in Figure 2
to accommodate
proper fusing.
Figure 2 - Star Configuration of Common Bus Connections
WARNING: The incorrect use or configuration of third-party assemblies can result in
reduced system reliability and drive damage.
L1
L2
L3
DC+
DC+
DC-
DC-
BR1 BR2
M1
L1
L1
L2
L2
L3
L3
DC+
DC-
BR1 BR2
M2
L1
L2
L3
DC+
DC-
BR1 BR2
M3
DC+ DC–
Power Distribution
Terminal Block or Bus Bar
Bus Supply
AC Drive 1
AC Drive 2
AC Drive 3
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