Rockwell Automation 2364F Regenerative DC Bus Supply Unit (RGU) - Manual (Page 21)

Publication 2364F-5.01– October 2003
Overview 1-5
Main Control Board
The main control board regulates the power structure operation,
controls other RGU operations according to user settings, and
communicates with external devices via SCANport, analog I/O,
discrete I/O, and R2R (which communicates with other RGUs).
Isolation Board
The isolation board scales input signals (AC line voltage, AC line
current, and DC bus voltage) and output signals to and from the main
control board and protects the main control board from overcurrent
and overvoltage conditions.
Gate Driver Board (and Power Supply)
The gate driver board receives power directly from the high voltage
DC bus. A DC to DC converter on the gate driver board steps full DC
bus voltage down to 24V DC, an additional DC to DC converter steps
the 24V DC down to ±15V DC and +5V DC, used to power the RGU
control card.
The gate driver board is connected directly to each IGBT gate lead
through a wire harness. The RGU controls the signals to the gate
drive board which in turn drives the IGBT gates on and off.
Control Power Transformer
The control power transformer steps down two phases of the 3-phase
AC line voltage to provide a single-phase, 115V AC control signal.
Control Transformer Fusing (Primary and Secondary)
Protects the transformer and control circuitry from excessive currents.