Owner manual

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
RGU
3-Phase
AC Line
DC Supply for
Drive Lineup
RGU RGU
RGU-to-RGU
Communications
RGU RGU
3-Phase
AC Line
DC Supply
for Drive
Lineup
R2R
Communication
Slave
Master
Common Mode Choke