Rockwell Automation 2364P Parallel DC Bus Supply Config. - Manual (Page 18)

Publication 2364P-5.01 December 1999
1-6 Theory of Operation
In the NRU//RGU configuration, the NRU has chokes on the DC bus.
These chokes reduce circulating current between the RGU and NRU.
If a slave RGU is in the configuration, the slave RGU will have a
common mode choke installed on its AC line.
Figure 1.9
NRU//RGU Configuration–Basic Components
The RGU evaluates the bus voltage and adjusts its current to maintain
the nominal bus voltage. If there are two RGUs in the configuration,
the master RGU evaluates the voltage and sends current commands to
the slave RGU, and both RGUs will switch their IGBTs to regulate
the necessary current on the DC bus.
N R U R GU
3-Ph ase
A C Line
D C S up ply
for D riv e
Lineup
D iode Bridg e
Pow er S tru cture
(w ith IG BT s)
C hokes