Owner manual

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
NRUs 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 WaveformNRU//RGU Configuration
NRU
3-Phase
AC Line
DC Supply for
Drive Lineup
RGU RGU
RGU-to-RGU
Communications
Line Voltage
Line Current