Rockwell Automation 2364E Non-Regenerative DC Bus Supply Unit (NRU) - Manual (Page 15)

Publication 2364E-5.01 April 2002
Chapter
1
Overview
This chapter introduces Rockwell Automation’s Bulletin 2364E
common DC bus, non-regenerative unit (NRU), describes the theory
of NRU operation, and provides comprehensive lists of NRU features
and standard options. Appendix A contains specifications on
available NRUs. Appendix B contains NRU catalog numbers with
descriptions. Appendix C provides some other details concerning AC
input connections, bus locations, and wireway meter covers.
What is the 2364E? We designed the NRU to be our single-direction power converter for
the front-end of a common DC bus drive system. Read this section
for a general description of NRU functionality and packaging.
What does the NRU do?
The NRU converts an incoming 3-phase, AC line voltage into:
• a common DC bus voltage and current
• a 115V AC NRU control voltage via a basic capacity control
transformer (Control power source upgrade options allow you to
select an increased transformer capacity to supply control power
to a 115V AC control bus)
The NRU applies the common bus DC voltage to the system power
bus and the 115V AC control voltage to a system control bus, if
desired. The system power bus and the control bus, if present, then
supply the voltage(s) to the remainder of the system.