Rockwell Automation 2364P Parallel DC Bus Supply Config. - Manual (Page 214)

Publication 2364P-5.01 December 1999
G-2
Motoring Current
Current which is being supplied to the inverters (through the DC bus) for motoring.
Non-Regenerative DC Bus Supply Unit (NRU)
A six-pulse DC power supply produced by Rockwell Automation The NRU is
typically used as a front end power supply on a drive system lineup.
NRU//RGU Configuration
A parallel configuration of one or two RGUs connecting to an NRU.
Overload
A condition where the unit is supplying current above its rated current. For
example, operating a unit at 150% overload would indicate that the unit is
supplying 150% of its rated current. Most units can operate with an overload
condition for a short period of time.
Power Factor (pf)
A measurement of the time phase difference between the voltage and current in an
AC circuit.
Power Structure
A 3-phase power bridge built in the RGU which converts AC to DC (motoring
current) and DC to PWM AC (regenerative current). The power structure includes
control boards, a precharge circuit, a power bridge, and a capacitor bank.
Regenerative DC Bus Supply Unit (RGU)
A regenerative DC power supply unit produced by Rockwell Automation. The
RGU is typically used as a front end power supply to provide motoring and
regenerative current for a drive system lineup.
Regenerating Current
Current which is being driven back from the motors (from motoring induction) to
the DC bus. RGUs are able to place regenerating current back onto the AC line.
RGU-to-RGU (R2R) Communications
A communication link used between master and slave RGUs. In R2R
communications, the master RGU passes current commands, status information,
and synchronization signals to the slave RGUs.
RGU//RGU Configuration
A parallel configuration of two or three RGUs (no NRUs).
Shipping Split
The parallel configurations are shipped in separate pieces which must be fixed
together.