Rockwell Automation 2364P Parallel DC Bus Supply Config. - Manual (Page 15)

Publication 2364P-5.01 December 1999
Theory of Operation 1-3
Parallel Configuration RGU//RGU Configurations
In an RGU//RGU configuration, each RGU supplies 100% motoring
current and 100% regenerative current. When operating, the master
RGU evaluates the bus voltage and sends current commands to the
slave RGUs through an RGU-to-RGU (R2R) communication
network. This allows the RGUs to operate together to supply the
appropriate current while maintaining a constant voltage on the DC
bus.
Figure 1.3
RGU//RGU Configuration
Each RGU//RGU configuration has one master RGU in parallel with
either one or two slave RGUs. Each slave RGU includes a common
mode choke accommodate for minor switching differences between
the RGUs and to reduce circulating currents between the master RGU
and the slave RGUs.
Figure 1.4
RGU//RGU Configuration–Master/Slave
R GU
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
Co m m u n ication s
RG U RG U
3-Ph as e
A C Lin e
D C S u pp ly
for D rive
Lin eu p
R2 R
C om m u n ica tio n
S lave
M aster
Com m on M ode Ch oke