24V Dc Power Supply - Allen-Bradley CENTERLINE 2100 Technical Data Manual

CENTERLINE 2100 Motor Control Center with IntelliCENTER Technology Using an EtherNet/IP Network

24V DC Power Supply

24V DC power is integrated throughout the IntelliCENTER EtherNet/IP MCC to provide power for the Stratix 5700
switch and various IMC devices. The integrated 24V DC power within the IntelliCENTER EtherNet/IP MCC can be
supplied by 24V DC power supply units. The 24V DC power supply units are available in these common configurations:
• Circuit breaker and control transformer
• Fusible disconnect and control transformer
• No disconnecting means, requires a separate 110...120V source
• Redundant configurations are also available with one of the following options:
– A Two-branch redundant unit can be included that accepts two separate power supply connections on the
input side and outputs one source to 24V DC circuit. When one power supply fails, the other takes over
automatically reducing device and network downtime. The separate two-branch unit allows the failed power
supply to be replaced without impacting the network. The two-branch unit can be fed by the following
options:
Two Rockwell-supplied 24V DC power supply units
Two external 24VDC power inputs provided by the customer
One Rockwell-supplied 24V DC power supply unit and one external power input provided by the customer
– A second standard power-supply unit can be added to an MCC section that already contains a standard power
supply. In this instance, the power supply in the lower unit location is wired to the 24V DC power within the
MCC. In the event of a failure, the 24V DC wire can be manually shortened to connect to the other unit in the
section
– A second 8 A power supply can be added in the same unit. The second power supply is wired with blocking
diodes to work in concert with the initial power supply. If a failure occurs, power supplies can only be replaced
during MCC network downtimes since both power supplies exist behind the same unit disconnect.
The number of 24V DC power supplies required throughout the IntelliCENTER EtherNet/IP MCC is dependent on
the number of Stratix 5700 switch and IMC devices in the MCC lineup that require 24V DC power. The integrated
MCC 24V DC power consists of multiple branches, each designed to support a maximum of 4 A of current draw. Each
branch is protected by a 1-pole mini circuit breaker. Each branch is connected to either a Rockwell Automation Ethernet
power supply unit that can support two branches or the two-branch redundant power unit if used. To make sure this
specification is not exceeded, the 24V DC power supply current draw for the MCC configuration is calculated at the
time of order entry. The calculations are based on the devices that require 24V DC in each MCC section. The result of
the calculations determines how many sections can be supported on one branch of the power supply. The 24V DC power
can be spliced between multiple sections.
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Figure 8 shows an example on how 24V DC power is configured.
Rockwell Automation Publication 2100-TD031E-EN-P - August 2016