Rockwell Automation 2364P Parallel DC Bus Supply Config. - Manual (Page 17)

Publication 2364P-5.01 December 1999
Theory of Operation 1-5
NRU//RGU Configurations
In the NRU//RGU configuration, the NRU is used to supply motoring
current to the DC bus, while the RGUs are used to regenerate current
to the AC line.
When motoring, the NRU operates to supply its maximum motoring
current to the DC bus, and the RGUs operate to supply 10% of their
maximum motoring current to the DC bus. When regenerating, the
NRU’s diode bridge stops operating, and the RGUs regenerate the
current back onto the AC line.
Figure 1.7
NRU//RGU Configuration
The NRU supplies motoring current through its diode bridge, and the
RGU supplies motoring and regenerative current through its power
structure.
Figure 1.8
Line Waveform–NRU//RGU Configuration
N R U
3-Ph as e
A C Lin e
D C S u pp ly for
D rive Lineup
RG U R GU
RG U-to-R GU
C om m u n ication s
L ine V o lta g e Line C urre nt